diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index abcba0b..5db8e78 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -31,11 +31,11 @@ jobs:
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
-      - uses: github/codeql-action/init@1c5b675653bb5c22dbe9b12b556ec555138e09fd #v4.38.1
+      - uses: github/codeql-action/init@2892aa5e19bbd11bc0cff5427e3b750a04d9e3c2 # v4.38.2
         with:
           languages: javascript-typescript
           queries: security-and-quality
 
-      - uses: github/codeql-action/analyze@1c5b675653bb5c22dbe9b12b556ec555138e09fd #v4.38.1
+      - uses: github/codeql-action/analyze@2892aa5e19bbd11bc0cff5427e3b750a04d9e3c2 # v4.38.2
         with:
           category: /language:javascript-typescript
diff --git a/extension.ts b/extension.ts
index 86d5950..08a9742 100644
--- a/extension.ts
+++ b/extension.ts
@@ -174,6 +174,27 @@ export function folderBreadcrumb(folders: BookmarkFolder[], folderId: string): s
   return parts.join(' › ');
 }
 
+/** Shape written by `exportBookmarks` and read back by `importBookmarks`. */
+export interface BookmarkExportData {
+  version: 1;
+  exportedAt: string;
+  bookmarks: Bookmark[];
+  folders: BookmarkFolder[];
+}
+
+function isBookmarkExportData(data: unknown): data is BookmarkExportData {
+  return (
+    typeof data === 'object' &&
+    data !== null &&
+    Array.isArray((data as BookmarkExportData).bookmarks) &&
+    Array.isArray((data as BookmarkExportData).folders)
+  );
+}
+
+function generateId(): string {
+  return `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
+}
+
 /** The extension's public API, returned from `activate()` — used by e2e tests to inspect state that isn't reachable through the tree view UI alone. */
 export interface ExtensionApi {
   store: BookmarkStore;
@@ -279,6 +300,12 @@ export function activate(context: vscode.ExtensionContext): ExtensionApi {
     vscode.commands.registerCommand('workspace-file-bookmarks.setViewModeTree', () =>
       provider.setViewMode('tree'),
     ),
+    vscode.commands.registerCommand('workspace-file-bookmarks.exportBookmarks', () =>
+      exportBookmarks(store),
+    ),
+    vscode.commands.registerCommand('workspace-file-bookmarks.importBookmarks', () =>
+      importBookmarks(store),
+    ),
   );
 
   return { store, provider };
@@ -365,7 +392,7 @@ export class BookmarkStore {
 
   createFolder(name: string, parentId: string | null = null): BookmarkFolder {
     const folder: BookmarkFolder = {
-      id: `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
+      id: generateId(),
       name,
       createdAt: Date.now(),
       parentId,
@@ -394,6 +421,49 @@ export class BookmarkStore {
     );
   }
 
+  /** Replaces all bookmarks and folders wholesale, e.g. importing over the existing set. */
+  replaceAll(bookmarks: Bookmark[], folders: BookmarkFolder[]) {
+    this.setFolders(folders);
+    this.setBookmarks(bookmarks);
+  }
+
+  /**
+   * Merges an imported bookmark/folder set into the existing store, appending rather than
+   * replacing. Every imported folder and bookmark gets a freshly generated id (and folder ids
+   * on both folders and bookmarks are remapped to match) so imported ids never collide with
+   * local ones; the imported folder hierarchy itself is preserved as-is. Bookmarks that already
+   * exist at the same uri/line range are skipped, mirroring `addBookmark`'s de-dupe.
+   */
+  mergeImport(
+    importedBookmarks: Bookmark[],
+    importedFolders: BookmarkFolder[],
+  ): { addedBookmarks: number; addedFolders: number } {
+    const folderIdMap = new Map<string, string>(importedFolders.map((f) => [f.id, generateId()]));
+    const remapFolderId = (id: string | null | undefined): string | null =>
+      (id && folderIdMap.get(id)) ?? null;
+
+    const newFolders = importedFolders.map((folder) => ({
+      ...folder,
+      id: folderIdMap.get(folder.id) as string,
+      parentId: remapFolderId(folder.parentId),
+    }));
+
+    const existingBookmarks = this.getAllBookmarks();
+    const newBookmarks = importedBookmarks
+      .filter(
+        (b) =>
+          !existingBookmarks.some(
+            (e) => e.uri === b.uri && e.lineStart === b.lineStart && e.lineEnd === b.lineEnd,
+          ),
+      )
+      .map((b) => ({ ...b, id: generateId(), folderId: remapFolderId(b.folderId) }));
+
+    this.setFolders([...this.getAllFolders(), ...newFolders]);
+    this.setBookmarks([...newBookmarks, ...existingBookmarks]);
+
+    return { addedBookmarks: newBookmarks.length, addedFolders: newFolders.length };
+  }
+
   private setBookmarks(bookmarks: Bookmark[]) {
     this.context.workspaceState.update(STORAGE_KEY_BOOKMARKS, bookmarks);
     this._onDidChange.fire();
@@ -651,7 +721,7 @@ export function toBookmark(uri: vscode.Uri, selection?: LineSelection): Bookmark
   const label = selection ? `${fileName}:${formatLineRange(selection)}` : fileName;
 
   return {
-    id: `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
+    id: generateId(),
     uri: uri.toString(),
     label,
     relativePath,
@@ -1071,6 +1141,95 @@ export async function moveToFolder(store: BookmarkStore, item: BookmarkTreeItem)
   store.moveBookmarkToFolder(item.bookmark.id, folderId);
 }
 
+/** Writes all bookmarks and folders to a JSON file the user picks via a save dialog. */
+export async function exportBookmarks(store: BookmarkStore): Promise<void> {
+  const data: BookmarkExportData = {
+    version: 1,
+    exportedAt: new Date().toISOString(),
+    bookmarks: store.getAllBookmarks(),
+    folders: store.getAllFolders(),
+  };
+
+  const uri = await vscode.window.showSaveDialog({
+    filters: { JSON: ['json'] },
+    saveLabel: 'Export Bookmarks',
+    defaultUri: vscode.Uri.file('workspace-file-bookmarks.json'),
+  });
+  if (!uri) {
+    return;
+  }
+
+  try {
+    await vscode.workspace.fs.writeFile(uri, Buffer.from(JSON.stringify(data, null, 2), 'utf8'));
+    vscode.window.showInformationMessage(
+      `Exported ${data.bookmarks.length} bookmark(s) and ${data.folders.length} folder(s).`,
+    );
+  } catch {
+    vscode.window.showErrorMessage('Could not write the export file.');
+  }
+}
+
+const IMPORT_MERGE_PICK = 'Merge with existing bookmarks';
+const IMPORT_REPLACE_PICK = 'Replace existing bookmarks';
+
+/**
+ * Reads bookmarks and folders from a JSON file the user picks via an open dialog, then either
+ * merges them into the current store or (after a confirmation, since it's destructive) replaces
+ * the current store outright.
+ */
+export async function importBookmarks(store: BookmarkStore): Promise<void> {
+  const uris = await vscode.window.showOpenDialog({
+    filters: { JSON: ['json'] },
+    canSelectMany: false,
+    openLabel: 'Import Bookmarks',
+  });
+  const uri = uris?.[0];
+  if (!uri) {
+    return;
+  }
+
+  let data: unknown;
+  try {
+    const bytes = await vscode.workspace.fs.readFile(uri);
+    data = JSON.parse(Buffer.from(bytes).toString('utf8'));
+  } catch {
+    vscode.window.showErrorMessage('Could not read or parse the import file.');
+    return;
+  }
+  if (!isBookmarkExportData(data)) {
+    vscode.window.showErrorMessage('That file is not a valid Workspace File Bookmarks export.');
+    return;
+  }
+
+  const mode = await vscode.window.showQuickPick([IMPORT_MERGE_PICK, IMPORT_REPLACE_PICK], {
+    placeHolder: `Import ${data.bookmarks.length} bookmark(s) and ${data.folders.length} folder(s)`,
+  });
+  if (!mode) {
+    return;
+  }
+
+  if (mode === IMPORT_REPLACE_PICK) {
+    const confirm = await vscode.window.showWarningMessage(
+      'Replace all existing bookmarks and folders with the imported set? This cannot be undone.',
+      { modal: true },
+      'Replace',
+    );
+    if (confirm !== 'Replace') {
+      return;
+    }
+    store.replaceAll(data.bookmarks, data.folders);
+    vscode.window.showInformationMessage(
+      `Imported ${data.bookmarks.length} bookmark(s) and ${data.folders.length} folder(s).`,
+    );
+    return;
+  }
+
+  const { addedBookmarks, addedFolders } = store.mergeImport(data.bookmarks, data.folders);
+  vscode.window.showInformationMessage(
+    `Merged ${addedBookmarks} bookmark(s) and ${addedFolders} folder(s); duplicates were skipped.`,
+  );
+}
+
 export async function addBookmarksToFolder(
   store: BookmarkStore,
   uri: vscode.Uri | undefined,
diff --git a/package-lock.json b/package-lock.json
index b4c1092..06632cc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,9 +11,9 @@
       "devDependencies": {
         "@eslint/js": "^10.0.1",
         "@types/mocha": "^10.0.10",
-        "@types/node": "^26.6.2",
+        "@types/node": "^26.6.3",
         "@types/vscode": "^1.138.0",
-        "@vitest/coverage-v8": "^5.0.1",
+        "@vitest/coverage-v8": "^5.0.2",
         "@vscode/test-cli": "^0.0.15",
         "@vscode/test-electron": "^3.1.0",
         "@vscode/vsce": "^4.0.0",
@@ -21,11 +21,11 @@
         "eslint": "^10.11.0",
         "eslint-config-prettier": "^10.1.8",
         "lefthook": "^2.1.14",
-        "prettier": "^3.9.8",
+        "prettier": "^3.9.9",
         "typescript": "~6.0.3",
-        "typescript-eslint": "^8.70.0",
-        "vite": "^8.3.0",
-        "vitest": "^5.0.1"
+        "typescript-eslint": "^8.71.0",
+        "vite": "^8.3.1",
+        "vitest": "^5.0.2"
       },
       "engines": {
         "vscode": "^1.138.0"
@@ -174,9 +174,9 @@
       }
     },
     "node_modules/@azure/msal-browser": {
-      "version": "5.22.0",
-      "resolved": "https://registry.npmjs.org/@azure/msal-browser/-/msal-browser-5.22.0.tgz",
-      "integrity": "sha512-5kgu9xeEKgGc2JeidxAtU15NJTqiH/CMCRRQAJ4Rac56kB7KVg91vbNmn+z3RO1vNomPN69UvjKG9h1Pghx6dQ==",
+      "version": "5.23.0",
+      "resolved": "https://registry.npmjs.org/@azure/msal-browser/-/msal-browser-5.23.0.tgz",
+      "integrity": "sha512-IRCwkRCK47hBXK+7bu67UZWY7HS0Jx1dZgi4C1HVbjlBum8Jy8fb2l87xFr6HxdQJWy951zRUHtwwDITHFAtaA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -1314,9 +1314,9 @@
       }
     },
     "node_modules/@oxc-project/types": {
-      "version": "0.150.0",
-      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.150.0.tgz",
-      "integrity": "sha512-rDS5/31E9HfPl/CIzGrn0DOlvBbXFseQ5URJ9sYMfstbKLD/c6Gm9vmRzRGDdAXyOIL4zmO37lc9RIwYqVruZw==",
+      "version": "0.151.0",
+      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.151.0.tgz",
+      "integrity": "sha512-J1yXrIlNDZVzE3ada310xeAw7nH8yCAyLPuUIsjKatFPmfn5bS1oW+cM+QsGOtVWd5nhSpbwZWx/rue+r5Z+PA==",
       "dev": true,
       "license": "MIT",
       "funding": {
@@ -1335,9 +1335,9 @@
       }
     },
     "node_modules/@rolldown/binding-android-arm-eabi": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm-eabi/-/binding-android-arm-eabi-1.2.9.tgz",
-      "integrity": "sha512-tNISae1QEf/vkb3xkRcjV5SEdzPE97We5IVaa2Z8jSszQPZ8U60B/YCYpw4QI7VidYsBtKavczXf+DyDs9WGxw==",
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm-eabi/-/binding-android-arm-eabi-1.2.11.tgz",
+      "integrity": "sha512-A5kXfGKvKWWZE0TtPrfsvT+q4Y5d1QG8gGUzpYjGydM+fARM9MuX90PrXYXe0XbsDVgyxxNzHo6giCj90bsFNw==",
       "cpu": [
         "arm"
       ],
@@ -1352,9 +1352,9 @@
       }
     },
     "node_modules/@rolldown/binding-android-arm64": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.2.9.tgz",
-      "integrity": "sha512-YC8YsI30o606GTZi0VyzYlsDKFP8W61i/QzayHDkLbNEz/IShqAmTa+hsJRj13xTHA0H+6fk4b2UmGn+Q/cMlg==",
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.2.11.tgz",
+      "integrity": "sha512-z6cTycz+iJ4PVkuL4HHW4DfTfoeU/2nqYYuSOrTmH7yHK5Y0LCOnA03V4ZNxavyVaU1oOqUgIg2klN/s+USGOA==",
       "cpu": [
         "arm64"
       ],
@@ -1369,9 +1369,9 @@
       }
     },
     "node_modules/@rolldown/binding-darwin-arm64": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-arm64/-/binding-darwin-arm64-1.2.9.tgz",
-      "integrity": "sha512-IwhlH3qK5urrY8hZiEgGkHKEFN901p/p2bjxCxJlr4GyNnF7wYpUvK+Y43uaRYuC4hpfjzbR3SJC3arX1jGvmw==",
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-arm64/-/binding-darwin-arm64-1.2.11.tgz",
+      "integrity": "sha512-jShvqNtP6vDC6/A5JOAzbVV+DkgHqhl/ScVCJEbt+TUY6QYz7YnXcrg3sLtFBniro0f/Ld50ZwCWA6f7KYD1nQ==",
       "cpu": [
         "arm64"
       ],
@@ -1386,9 +1386,9 @@
       }
     },
     "node_modules/@rolldown/binding-darwin-x64": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-x64/-/binding-darwin-x64-1.2.9.tgz",
-      "integrity": "sha512-XxpJfVzFh+jilRxIXUqcfYAYcunIc/XEzIizsOL1fcJee5Sf7H3mH8WlLmfHfluz5amqR88QQo9izKtmMlavAw==",
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-x64/-/binding-darwin-x64-1.2.11.tgz",
+      "integrity": "sha512-f2i2xiNWq1Z1l2++q2fuhZRdLAT3aqxD6vRNm1RAxpUoBcdqNB3C0s1Bt+K+PbEx2F5F4gQp6hqKkphCY/xF9w==",
       "cpu": [
         "x64"
       ],
@@ -1403,9 +1403,9 @@
       }
     },
     "node_modules/@rolldown/binding-freebsd-x64": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-freebsd-x64/-/binding-freebsd-x64-1.2.9.tgz",
-      "integrity": "sha512-kSfvhmgeWyfkbT3p/1s5vSgboogoah2zkm9fX2zjg2hHxSV7T4KhMWRUUaRk4OXNqoD3QAUeRqLcs1aZOK4U1g==",
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-freebsd-x64/-/binding-freebsd-x64-1.2.11.tgz",
+      "integrity": "sha512-4Ir5FSOKIAMr4r0kExpt1s3bMgzJU3rA45AYOHtQpls0oNeqcYBKrWMlckrYH4KCfGLfkfn1tN1dmZPMVsdXow==",
       "cpu": [
         "x64"
       ],
@@ -1420,9 +1420,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-arm-gnueabihf": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.2.9.tgz",
-      "integrity": "sha512-1RVzG17pxqbTfYLC352JlLt6kKLG+6Hr30n8DlIJqsnV5luUDd2Qdx9Ayw1Cabfyb1K9k0jXEZ7evxkRoT+uiw==",
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.2.11.tgz",
+      "integrity": "sha512-/gnRDM+39BROzAN/k1OZjDPnDMcZxB/0EUxKjONO5yVkNEvlsoMDrxGNKgZi/ttFriS2gwlDNzB65pvNbFOXIQ==",
       "cpu": [
         "arm"
       ],
@@ -1437,9 +1437,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-arm64-gnu": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.2.9.tgz",
-      "integrity": "sha512-BXqPvZ2drqVD+/Z8UpKwcs4Mp7grM+eGFku4CAEKrEtcbAsUpzREphK1sogCRZGreVPiMkiiBtw0n3TPteuqvw==",
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.2.11.tgz",
+      "integrity": "sha512-PFaK8HwvAHbaKbBcDNQihjMKYvFnA5hiENx/l5tphTDz1E0WFp32l0A7aq7lyUwGsRw/xSrNIy/gIK4thrSCrw==",
       "cpu": [
         "arm64"
       ],
@@ -1457,9 +1457,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-arm64-musl": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-musl/-/binding-linux-arm64-musl-1.2.9.tgz",
-      "integrity": "sha512-11vWvo8YDwLzukt27J3aYDWU+gg2P7J+ZOmiJ0hkF5BXZDW7pVya7r40MXDy6ya0i9KamoENSVKIugvJNgFXIA==",
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-arm64-musl/-/binding-linux-arm64-musl-1.2.11.tgz",
+      "integrity": "sha512-AskzJUIKRLPxkruR1wLKewGbOw+EYfU/9lOrBFj4AFrEA8hPpKFnODWNu2WLaNs0QNkEb9QIJufmVZZIL/bJlg==",
       "cpu": [
         "arm64"
       ],
@@ -1477,9 +1477,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-ppc64-gnu": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-ppc64-gnu/-/binding-linux-ppc64-gnu-1.2.9.tgz",
-      "integrity": "sha512-a1tijMkdwsIARtc0F39ApURROkf3NwqinI6TOiSSWCTR7dT96dffNvMUtDHnq64wKNTIZOIlzKrFvvFUznJiyw==",
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-ppc64-gnu/-/binding-linux-ppc64-gnu-1.2.11.tgz",
+      "integrity": "sha512-qlUGAheh2yh8afH7QBgx0PrRHN85hKnNd78x8MeMhXivuevgd8vgf6/CstOzmNKY/lLTHvNTrPy98cLnAugzJw==",
       "cpu": [
         "ppc64"
       ],
@@ -1497,9 +1497,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-s390x-gnu": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-s390x-gnu/-/binding-linux-s390x-gnu-1.2.9.tgz",
-      "integrity": "sha512-x6SQNdAvv4c3hWqTMaWuawzMX9myaCs/yEmlGsxJzkdClnHW7FbrjQuSiRDhuSYzEYoEMhsaJy9qHG/XNemJPQ==",
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-s390x-gnu/-/binding-linux-s390x-gnu-1.2.11.tgz",
+      "integrity": "sha512-secpEad+0vCbSfn8upFySkDskv+bGPk3THSDS9Y89yc4rb4kzqHp8Dmyd9BkQW4SnhNXBZCl/6CrO//hZahNJQ==",
       "cpu": [
         "s390x"
       ],
@@ -1517,9 +1517,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-x64-gnu": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-gnu/-/binding-linux-x64-gnu-1.2.9.tgz",
-      "integrity": "sha512-9s0AZ8BFK5/n7B/TBoa2yJE3gI3KURrbXcPBlsAsvjU4VeJKgE90y1YtNxyEUIcHPQkg6/yfF3qihUrcM/Kf0Q==",
+      "version": "1.2.11",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-gnu/-/binding-linux-x64-gnu-1.2.11.tgz",
+      "integrity": "sha512-mOVBT3dPpkWm8XBWPmU4bf+U6dYDLeMo/9ojUmis4N0L5uu10qra5vOyngZ7/PSdoE4G9KvRt4bloRxNjLas7A==",
       "cpu": [
         "x64"
       ],
@@ -1537,9 +1537,9 @@
       }
     },
     "node_modules/@rolldown/binding-linux-x64-musl": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/@rolldown/binding-linux-x64-musl/-/binding-linux-x64-musl-1.2.9.tgz",
-      "integrity": "sha512-P7VWAmV+WdJluH7ovnRGoiv2i8To7GAZ+kGzfGup635cyL7SyYl3lSUaA3Gp5THf0n/Co5EyEqb2zbqq+nMOHQ==",
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@@ -5768,13 +5768,6 @@
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@@ -6227,16 +6213,16 @@
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-        "rolldown": "~1.2.6",
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@@ -6305,14 +6291,14 @@
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+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-5.0.2.tgz",
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       "license": "MIT",
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-        "@vitest/mocker": "5.0.1",
+        "@vitest/mocker": "5.0.2",
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         "es-module-lexer": "^2.3.2",
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@@ -6320,10 +6306,10 @@
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         "vitest": "vitest.mjs"
@@ -6338,12 +6324,12 @@
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-        "@vitest/browser-playwright": "5.0.1",
-        "@vitest/browser-preview": "5.0.1",
+        "@vitest/browser-playwright": "5.0.2",
+        "@vitest/browser-preview": "5.0.2",
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-        "@vitest/coverage-istanbul": "5.0.1",
-        "@vitest/coverage-v8": "5.0.1",
-        "@vitest/ui": "5.0.1",
+        "@vitest/coverage-istanbul": "5.0.2",
+        "@vitest/coverage-v8": "5.0.2",
+        "@vitest/ui": "5.0.2",
         "happy-dom": "*",
         "jsdom": "*",
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@@ -6404,20 +6390,16 @@
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+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-3.2.2.tgz",
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       "bin": {
         "why-is-node-running": "cli.js"
       },
       "engines": {
-        "node": ">=8"
+        "node": ">=20.11"
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@@ -6590,9 +6572,9 @@
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@@ -6634,9 +6616,9 @@
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+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-8.3.0.tgz",
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diff --git a/package.json b/package.json
index 2d0b520..4afd1ee 100644
--- a/package.json
+++ b/package.json
@@ -176,6 +176,18 @@
         "title": "View as Tree",
         "category": "Workspace File Bookmarks",
         "icon": "$(list-tree)"
+      },
+      {
+        "command": "workspace-file-bookmarks.exportBookmarks",
+        "title": "Export Bookmarks...",
+        "category": "Workspace File Bookmarks",
+        "icon": "$(export)"
+      },
+      {
+        "command": "workspace-file-bookmarks.importBookmarks",
+        "title": "Import Bookmarks...",
+        "category": "Workspace File Bookmarks",
+        "icon": "$(desktop-download)"
       }
     ],
     "menus": {
@@ -219,6 +231,16 @@
           "command": "workspace-file-bookmarks.setViewModeTree",
           "when": "view == workspace-file-bookmarks-view && workspace-file-bookmarks.viewMode == list",
           "group": "navigation@5"
+        },
+        {
+          "command": "workspace-file-bookmarks.exportBookmarks",
+          "when": "view == workspace-file-bookmarks-view",
+          "group": "9_data@1"
+        },
+        {
+          "command": "workspace-file-bookmarks.importBookmarks",
+          "when": "view == workspace-file-bookmarks-view",
+          "group": "9_data@2"
         }
       ],
       "view/item/context": [
@@ -320,14 +342,14 @@
   },
   "overrides": {
     "diff": "^9.0.0",
-    "serialize-javascript": "^7.1.1"
+    "serialize-javascript": "^7.1.2"
   },
   "devDependencies": {
     "@eslint/js": "^10.0.1",
     "@types/mocha": "^10.0.10",
-    "@types/node": "^26.6.2",
+    "@types/node": "^26.6.3",
     "@types/vscode": "^1.138.0",
-    "@vitest/coverage-v8": "^5.0.1",
+    "@vitest/coverage-v8": "^5.0.2",
     "@vscode/test-cli": "^0.0.15",
     "@vscode/test-electron": "^3.1.0",
     "@vscode/vsce": "^4.0.0",
@@ -335,10 +357,10 @@
     "eslint": "^10.11.0",
     "eslint-config-prettier": "^10.1.8",
     "lefthook": "^2.1.14",
-    "prettier": "^3.9.8",
+    "prettier": "^3.9.9",
     "typescript": "~6.0.3",
-    "typescript-eslint": "^8.70.0",
-    "vite": "^8.3.0",
-    "vitest": "^5.0.1"
+    "typescript-eslint": "^8.71.0",
+    "vite": "^8.3.1",
+    "vitest": "^5.0.2"
   }
 }
diff --git a/scripts/dep_update/serialize-javascript.sh b/scripts/dep_update/serialize-javascript.sh
new file mode 100644
index 0000000..f4e44b8
--- /dev/null
+++ b/scripts/dep_update/serialize-javascript.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+set -euo pipefail
+
+REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+
+NPM_MODULES=(
+        "$REPO_ROOT"
+    )
+
+for MODULE in "${NPM_MODULES[@]}"; do
+    echo "============================================================================"
+    echo "Updating: $MODULE"
+    echo "============================================================================"
+
+    cd "$MODULE" || exit 1
+
+    if [ -n "$(npm pkg get overrides.serialize-javascript)" ]; then
+        LATEST="$(npm view serialize-javascript version)"
+        npm pkg set "overrides.serialize-javascript=^${LATEST}"
+        npm install
+    else
+        npm update serialize-javascript
+    fi
+done
diff --git a/test/activate.test.ts b/test/activate.test.ts
index beff3b0..d1a9481 100644
--- a/test/activate.test.ts
+++ b/test/activate.test.ts
@@ -11,8 +11,8 @@ describe('activate', () => {
     activate(context as any);
 
     expect(window.createTreeView).toHaveBeenCalledOnce();
-    expect(commands.registerCommand).toHaveBeenCalledTimes(21);
-    expect((context as any).subscriptions).toHaveLength(22); // tree view + 21 commands
+    expect(commands.registerCommand).toHaveBeenCalledTimes(23);
+    expect((context as any).subscriptions).toHaveLength(24); // tree view + 23 commands
   });
 
   it('exercises every registered command handler at least once', async () => {
@@ -66,8 +66,12 @@ describe('activate', () => {
     await handlers.get('workspace-file-bookmarks.openAllInFolder')?.({ folder, bookmarks: [] });
     await handlers.get('workspace-file-bookmarks.setViewModeList')?.();
     await handlers.get('workspace-file-bookmarks.setViewModeTree')?.();
+    window.showSaveDialog.mockResolvedValue(undefined);
+    await handlers.get('workspace-file-bookmarks.exportBookmarks')?.();
+    window.showOpenDialog.mockResolvedValue(undefined);
+    await handlers.get('workspace-file-bookmarks.importBookmarks')?.();
 
-    expect(handlers.size).toBe(21);
+    expect(handlers.size).toBe(23);
   });
 });
 
diff --git a/test/bookmarkStore.test.ts b/test/bookmarkStore.test.ts
index bd5759d..08f1e56 100644
--- a/test/bookmarkStore.test.ts
+++ b/test/bookmarkStore.test.ts
@@ -416,3 +416,68 @@ describe('folderBreadcrumb', () => {
     expect(folderBreadcrumb([], 'missing')).toBe('');
   });
 });
+
+describe('replaceAll', () => {
+  it('discards the existing bookmarks and folders and stores the given ones', () => {
+    const store = newStore();
+    store.addBookmark(makeBookmark({ id: 'old' }));
+    store.createFolder('Old Folder');
+
+    store.replaceAll(
+      [makeBookmark({ id: 'new', uri: 'file:///repo/src/b.ts' })],
+      [{ id: 'f1', name: 'New Folder', createdAt: 1 }],
+    );
+
+    expect(store.getAllBookmarks().map((b) => b.id)).toEqual(['new']);
+    expect(store.getAllFolders().map((f) => f.id)).toEqual(['f1']);
+  });
+});
+
+describe('mergeImport', () => {
+  it('appends imported bookmarks and folders under freshly generated ids', () => {
+    const store = newStore();
+    store.addBookmark(makeBookmark({ id: 'existing' }));
+
+    const result = store.mergeImport(
+      [makeBookmark({ id: 'imported', uri: 'file:///repo/src/b.ts', folderId: 'imported-folder' })],
+      [{ id: 'imported-folder', name: 'Imported', createdAt: 1 }],
+    );
+
+    expect(result).toEqual({ addedBookmarks: 1, addedFolders: 1 });
+    const bookmarks = store.getAllBookmarks();
+    expect(bookmarks).toHaveLength(2);
+    const imported = bookmarks.find((b) => b.uri === 'file:///repo/src/b.ts')!;
+    expect(imported.id).not.toBe('imported');
+    const folders = store.getAllFolders();
+    expect(folders).toHaveLength(1);
+    expect(folders[0].id).not.toBe('imported-folder');
+    expect(imported.folderId).toBe(folders[0].id);
+  });
+
+  it('remaps parentId references within the imported folder hierarchy', () => {
+    const store = newStore();
+
+    store.mergeImport(
+      [],
+      [
+        { id: 'parent', name: 'Parent', createdAt: 1 },
+        { id: 'child', name: 'Child', createdAt: 2, parentId: 'parent' },
+      ],
+    );
+
+    const folders = store.getAllFolders();
+    const parent = folders.find((f) => f.name === 'Parent')!;
+    const child = folders.find((f) => f.name === 'Child')!;
+    expect(child.parentId).toBe(parent.id);
+  });
+
+  it('skips bookmarks that already exist at the same uri and line range', () => {
+    const store = newStore();
+    store.addBookmark(makeBookmark({ id: 'existing', lineStart: 5, lineEnd: 5 }));
+
+    const result = store.mergeImport([makeBookmark({ id: 'dup', lineStart: 5, lineEnd: 5 })], []);
+
+    expect(result).toEqual({ addedBookmarks: 0, addedFolders: 0 });
+    expect(store.getAllBookmarks()).toHaveLength(1);
+  });
+});
diff --git a/test/commands.test.ts b/test/commands.test.ts
index cddd9df..5cf44f7 100644
--- a/test/commands.test.ts
+++ b/test/commands.test.ts
@@ -9,8 +9,10 @@ import {
   createSubfolder,
   deleteFolder,
   editBookmarkTags,
+  exportBookmarks,
   filterBookmarks,
   filterByTag,
+  importBookmarks,
   moveFolderToParent,
   moveToFolder,
   openAllInFolder,
@@ -769,3 +771,148 @@ describe('addBookmarksToFolder', () => {
     expect(store.getAllBookmarks()).toHaveLength(0);
   });
 });
+
+describe('exportBookmarks', () => {
+  it('writes bookmarks and folders to the picked file', async () => {
+    const store = newStore();
+    store.addBookmark(makeBookmark({ id: 'a' }));
+    store.createFolder('Backend');
+    const uri = Uri.file('/tmp/export.json');
+    window.showSaveDialog.mockResolvedValue(uri);
+
+    await exportBookmarks(store);
+
+    expect(workspace.fs.writeFile).toHaveBeenCalledOnce();
+    const [writtenUri, bytes] = workspace.fs.writeFile.mock.calls[0];
+    expect(writtenUri).toBe(uri);
+    const data = JSON.parse(Buffer.from(bytes).toString('utf8'));
+    expect(data.bookmarks).toHaveLength(1);
+    expect(data.folders).toHaveLength(1);
+    expect(window.showInformationMessage).toHaveBeenCalledOnce();
+  });
+
+  it('does nothing when the save dialog is cancelled', async () => {
+    const store = newStore();
+    window.showSaveDialog.mockResolvedValue(undefined);
+
+    await exportBookmarks(store);
+
+    expect(workspace.fs.writeFile).not.toHaveBeenCalled();
+  });
+
+  it('shows an error if writing fails', async () => {
+    const store = newStore();
+    window.showSaveDialog.mockResolvedValue(Uri.file('/tmp/export.json'));
+    workspace.fs.writeFile.mockRejectedValue(new Error('disk full'));
+
+    await exportBookmarks(store);
+
+    expect(window.showErrorMessage).toHaveBeenCalledOnce();
+  });
+});
+
+describe('importBookmarks', () => {
+  function mockFileContents(data: unknown) {
+    workspace.fs.readFile.mockResolvedValue(Buffer.from(JSON.stringify(data), 'utf8'));
+  }
+
+  it('does nothing when the open dialog is cancelled', async () => {
+    const store = newStore();
+    window.showOpenDialog.mockResolvedValue(undefined);
+
+    await importBookmarks(store);
+
+    expect(workspace.fs.readFile).not.toHaveBeenCalled();
+  });
+
+  it('shows an error when the file cannot be read or parsed', async () => {
+    const store = newStore();
+    window.showOpenDialog.mockResolvedValue([Uri.file('/tmp/import.json')]);
+    workspace.fs.readFile.mockRejectedValue(new Error('not found'));
+
+    await importBookmarks(store);
+
+    expect(window.showErrorMessage).toHaveBeenCalledOnce();
+  });
+
+  it('shows an error when the file is not a valid export', async () => {
+    const store = newStore();
+    window.showOpenDialog.mockResolvedValue([Uri.file('/tmp/import.json')]);
+    mockFileContents({ foo: 'bar' });
+
+    await importBookmarks(store);
+
+    expect(window.showErrorMessage).toHaveBeenCalledOnce();
+    expect(store.getAllBookmarks()).toHaveLength(0);
+  });
+
+  it('does nothing when the merge/replace picker is cancelled', async () => {
+    const store = newStore();
+    window.showOpenDialog.mockResolvedValue([Uri.file('/tmp/import.json')]);
+    mockFileContents({ version: 1, exportedAt: '', bookmarks: [makeBookmark()], folders: [] });
+    window.showQuickPick.mockResolvedValue(undefined);
+
+    await importBookmarks(store);
+
+    expect(store.getAllBookmarks()).toHaveLength(0);
+  });
+
+  it('merges imported bookmarks and folders into the existing store', async () => {
+    const store = newStore();
+    store.addBookmark(makeBookmark({ id: 'existing' }));
+    window.showOpenDialog.mockResolvedValue([Uri.file('/tmp/import.json')]);
+    mockFileContents({
+      version: 1,
+      exportedAt: '',
+      bookmarks: [makeBookmark({ id: 'imported', uri: 'file:///repo/src/b.ts' })],
+      folders: [makeFolder({ id: 'f1' })],
+    });
+    window.showQuickPick.mockResolvedValue('Merge with existing bookmarks');
+
+    await importBookmarks(store);
+
+    expect(store.getAllBookmarks()).toHaveLength(2);
+    expect(store.getAllFolders()).toHaveLength(1);
+    expect(window.showInformationMessage).toHaveBeenCalledOnce();
+  });
+
+  it('replaces the store after confirmation', async () => {
+    const store = newStore();
+    store.addBookmark(makeBookmark({ id: 'existing' }));
+    window.showOpenDialog.mockResolvedValue([Uri.file('/tmp/import.json')]);
+    mockFileContents({
+      version: 1,
+      exportedAt: '',
+      bookmarks: [makeBookmark({ id: 'imported' })],
+      folders: [],
+    });
+    window.showQuickPick.mockResolvedValue('Replace existing bookmarks');
+    window.showWarningMessage.mockResolvedValue('Replace');
+
+    await importBookmarks(store);
+
+    const bookmarks = store.getAllBookmarks();
+    expect(bookmarks).toHaveLength(1);
+    expect(bookmarks[0].id).toBe('imported');
+  });
+
+  it('does not replace when the confirmation is declined', async () => {
+    const store = newStore();
+    store.addBookmark(makeBookmark({ id: 'existing' }));
+    window.showOpenDialog.mockResolvedValue([Uri.file('/tmp/import.json')]);
+    mockFileContents({
+      version: 1,
+      exportedAt: '',
+      bookmarks: [makeBookmark({ id: 'imported' })],
+      folders: [],
+    });
+    window.showQuickPick.mockResolvedValue('Replace existing bookmarks');
+    window.showWarningMessage.mockResolvedValue(undefined);
+
+    await importBookmarks(store);
+
+    const bookmarks = store.getAllBookmarks();
+    expect(bookmarks).toHaveLength(1);
+    expect(bookmarks[0].id).toBe('existing');
+  });
+});
diff --git a/test/e2e/extension.e2e.test.ts b/test/e2e/extension.e2e.test.ts
index 720390b..561407a 100644
--- a/test/e2e/extension.e2e.test.ts
+++ b/test/e2e/extension.e2e.test.ts
@@ -1,4 +1,5 @@
 import * as assert from 'node:assert/strict';
+import * as os from 'node:os';
 import * as path from 'node:path';
 import * as vscode from 'vscode';
 import type { BookmarkTreeItem, ExtensionApi, FolderGroupItem } from '../../extension';
@@ -64,6 +65,8 @@ describe('Workspace File Bookmarks (e2e)', () => {
       'workspace-file-bookmarks.openAllInFolder',
       'workspace-file-bookmarks.setViewModeList',
       'workspace-file-bookmarks.setViewModeTree',
+      'workspace-file-bookmarks.exportBookmarks',
+      'workspace-file-bookmarks.importBookmarks',
     ]) {
       assert.ok(commands.includes(id), `expected command "${id}" to be registered`);
     }
@@ -229,4 +232,49 @@ describe('Workspace File Bookmarks (e2e)', () => {
     await provider.handleDrop(undefined, dataTransfer);
     assert.equal(store.getAllFolders().find((f) => f.id === child.id)?.parentId, null);
   });
+
+  it('round-trips bookmarks and folders through exportBookmarks and importBookmarks', async () => {
+    const { store } = await getApi();
+    const folder = store.createFolder('Backend');
+    const document = await vscode.workspace.openTextDocument(fixtureUri('src/sample-a.ts'));
+    await vscode.window.showTextDocument(document);
+    await vscode.commands.executeCommand('workspace-file-bookmarks.addBookmark');
+    store.moveBookmarkToFolder(store.getAllBookmarks()[0].id, folder.id);
+    const exportUri = vscode.Uri.file(path.join(os.tmpdir(), `wfb-e2e-export-${Date.now()}.json`));
+
+    const originalShowSaveDialog = vscode.window.showSaveDialog;
+    const originalShowOpenDialog = vscode.window.showOpenDialog;
+    const originalShowQuickPick = vscode.window.showQuickPick;
+    try {
+      (vscode.window as any).showSaveDialog = async () => exportUri;
+      await vscode.commands.executeCommand('workspace-file-bookmarks.exportBookmarks');
+
+      const written = JSON.parse(
+        Buffer.from(await vscode.workspace.fs.readFile(exportUri)).toString('utf8'),
+      );
+      assert.equal(written.bookmarks.length, 1);
+      assert.equal(written.folders.length, 1);
+
+      for (const bookmark of store.getAllBookmarks()) {
+        store.removeBookmark(bookmark.id);
+      }
+      for (const existingFolder of store.getAllFolders()) {
+        store.deleteFolder(existingFolder.id);
+      }
+
+      (vscode.window as any).showOpenDialog = async () => [exportUri];
+      (vscode.window as any).showQuickPick = async () => 'Merge with existing bookmarks';
+      await vscode.commands.executeCommand('workspace-file-bookmarks.importBookmarks');
+
+      assert.equal(store.getAllBookmarks().length, 1);
+      assert.equal(store.getAllFolders().length, 1);
+      assert.equal(store.getAllBookmarks()[0].relativePath, 'src/sample-a.ts');
+      assert.equal(store.getAllFolders()[0].name, 'Backend');
+    } finally {
+      vscode.window.showSaveDialog = originalShowSaveDialog;
+      vscode.window.showOpenDialog = originalShowOpenDialog;
+      vscode.window.showQuickPick = originalShowQuickPick;
+      await vscode.workspace.fs.delete(exportUri);
+    }
+  });
 });
diff --git a/test/vscode-mock.ts b/test/vscode-mock.ts
index 3f1b357..110ab5d 100644
--- a/test/vscode-mock.ts
+++ b/test/vscode-mock.ts
@@ -147,6 +147,8 @@ export const window = {
   showErrorMessage: vi.fn(),
   showInputBox: vi.fn(),
   showQuickPick: vi.fn(),
+  showSaveDialog: vi.fn(),
+  showOpenDialog: vi.fn(),
   showTextDocument: vi.fn(() => ({
     selection: undefined,
     revealRange: vi.fn(),
@@ -160,6 +162,10 @@ export const workspace = {
   getWorkspaceFolder: vi.fn(),
   asRelativePath: vi.fn((uri: Uri) => uri.fsPath),
   openTextDocument: vi.fn(),
+  fs: {
+    readFile: vi.fn(),
+    writeFile: vi.fn(),
+  },
 };
 
 export const commands = {