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Merged
ShubhamOulkar merged 3 commits into from
Sep 3, 2026
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chore: rewrite HTML tables in migrating-4.mdx to markdown #2485

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856281c
fix: make all tables scrollable
krzysdz Aug 8, 2026
ef9905b
Merge branch 'main' into scrollable-tables
ShubhamOulkar Aug 29, 2026
7414ff8
Remove wrapper from HTML tables
krzysdz Sep 2, 2026
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231 changes: 32 additions & 199 deletions src/content/pages/en/guide/migrating-4.mdx
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Expand Up @@ -43,133 +43,23 @@ middleware that is required to run your app. Simply follow these steps:

The following table lists Express 3 middleware and their counterparts in Express 4.

<table class="doctable" border="1">
<tr>
<th>Express 3</th>
<th>Express 4</th>
</tr>
<tr>
<td>
<code>express.bodyParser</code>
</td>
<td>
<a href="https://github.com/expressjs/body-parser">body-parser</a> +
<a href="https://github.com/expressjs/multer">multer</a>
</td>
</tr>
<tr>
<td>
<code>express.compress</code>
</td>
<td>
<a href="https://github.com/expressjs/compression">compression</a>
</td>
</tr>
<tr>
<td>
<code>express.cookieSession</code>
</td>
<td>
<a href="https://github.com/expressjs/cookie-session">cookie-session</a>
</td>
</tr>
<tr>
<td>
<code>express.cookieParser</code>
</td>
<td>
<a href="https://github.com/expressjs/cookie-parser">cookie-parser</a>
</td>
</tr>
<tr>
<td>
<code>express.logger</code>
</td>
<td>
<a href="https://github.com/expressjs/morgan">morgan</a>
</td>
</tr>
<tr>
<td>
<code>express.session</code>
</td>
<td>
<a href="https://github.com/expressjs/session">express-session</a>
</td>
</tr>
<tr>
<td>
<code>express.favicon</code>
</td>
<td>
<a href="https://github.com/expressjs/serve-favicon">serve-favicon</a>
</td>
</tr>
<tr>
<td>
<code>express.responseTime</code>
</td>
<td>
<a href="https://github.com/expressjs/response-time">response-time</a>
</td>
</tr>
<tr>
<td>
<code>express.errorHandler</code>
</td>
<td>
<a href="https://github.com/expressjs/errorhandler">errorhandler</a>
</td>
</tr>
<tr>
<td>
<code>express.methodOverride</code>
</td>
<td>
<a href="https://github.com/expressjs/method-override">method-override</a>
</td>
</tr>
<tr>
<td>
<code>express.timeout</code>
</td>
<td>
<a href="https://github.com/expressjs/timeout">connect-timeout</a>
</td>
</tr>
<tr>
<td>
<code>express.vhost</code>
</td>
<td>
<a href="https://github.com/expressjs/vhost">vhost</a>
</td>
</tr>
<tr>
<td>
<code>express.csrf</code>
</td>
<td>
<a href="https://github.com/expressjs/csurf">csurf</a>
</td>
</tr>
<tr>
<td>
<code>express.directory</code>
</td>
<td>
<a href="https://github.com/expressjs/serve-index">serve-index</a>
</td>
</tr>
<tr>
<td>
<code>express.static</code>
</td>
<td>
<a href="https://github.com/expressjs/serve-static">serve-static</a>
</td>
</tr>
</table>
| Express 3 | Express 4 |
| ------------------------ | ------------------------------------------------------------------------------------------------------- |
| `express.bodyParser` | [body-parser](https://github.com/expressjs/body-parser) + [multer](https://github.com/expressjs/multer) |
| `express.compress` | [compression](https://github.com/expressjs/compression) |
| `express.cookieSession` | [cookie-session](https://github.com/expressjs/cookie-session) |
| `express.cookieParser` | [cookie-parser](https://github.com/expressjs/cookie-parser) |
| `express.logger` | [morgan](https://github.com/expressjs/morgan) |
| `express.session` | [express-session](https://github.com/expressjs/session) |
| `express.favicon` | [serve-favicon](https://github.com/expressjs/serve-favicon) |
| `express.responseTime` | [response-time](https://github.com/expressjs/response-time) |
| `express.errorHandler` | [errorhandler](https://github.com/expressjs/errorhandler) |
| `express.methodOverride` | [method-override](https://github.com/expressjs/method-override) |
| `express.timeout` | [connect-timeout](https://github.com/expressjs/timeout) |
| `express.vhost` | [vhost](https://github.com/expressjs/vhost) |
| `express.csrf` | [csurf](https://github.com/expressjs/csurf) |
| `express.directory` | [serve-index](https://github.com/expressjs/serve-index) |
| `express.static` | [serve-static](https://github.com/expressjs/serve-static) |

Here is the [complete list](https://github.com/senchalabs/connect#middleware) of Express 4 middleware.

Expand Down Expand Up @@ -305,78 +195,21 @@ middleware that is specific to the route.

The following table lists other small but important changes in Express 4:

<table class="doctable" border="1">
<tr>
<th>Object</th>
<th>Description</th>
</tr>
<tr>
<td>Node.js</td>
<td>Express 4 requires Node.js 0.10.x or later and has dropped support for Node.js 0.8.x.</td>
</tr>
<tr>
<td markdown="1">`http.createServer()`</td>
<td markdown="1">
The `http` module is no longer needed, unless you need to directly work with it
(socket.io/SPDY/HTTPS). The app can be started by using the `app.listen()` function.
</td>
</tr>
<tr>
<td markdown="1">`app.configure()`</td>
<td markdown="1">
The `app.configure()` function has been removed. Use the `process.env.NODE_ENV` or
`app.get('env')` function to detect the environment and configure the app accordingly.
</td>
</tr>
<tr>
<td markdown="1">`json spaces`</td>
<td markdown="1">
The `json spaces` application property is disabled by default in Express 4.
</td>
</tr>
<tr>
<td markdown="1">`req.accepted()`</td>
<td markdown="1">
Use `req.accepts()`, `req.acceptsEncodings()`, `req.acceptsCharsets()`, and
`req.acceptsLanguages()`.
</td>
</tr>
<tr>
<td markdown="1">`res.location()`</td>
<td markdown="1">No longer resolves relative URLs.</td>
</tr>
<tr>
<td markdown="1">`req.params`</td>
<td markdown="1">Was an array; now an object.</td>
</tr>
<tr>
<td markdown="1">`res.locals`</td>
<td markdown="1">Was a function; now an object.</td>
</tr>
<tr>
<td markdown="1">`res.headerSent`</td>
<td markdown="1">Changed to `res.headersSent`.</td>
</tr>
<tr>
<td markdown="1">`app.route`</td>
<td markdown="1">Now available as `app.mountpath`.</td>
</tr>
<tr>
<td markdown="1">`res.on('header')`</td>
<td markdown="1">Removed.</td>
</tr>
<tr>
<td markdown="1">`res.charset`</td>
<td markdown="1">Removed.</td>
</tr>
<tr>
<td markdown="1">`res.setHeader('Set-Cookie', val)`</td>
<td markdown="1">
Functionality is now limited to setting the basic cookie value. Use `res.cookie()` for added
functionality.
</td>
</tr>
</table>
| Object | Description |
| ---------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Node.js | Express 4 requires Node.js 0.10.x or later and has dropped support for Node.js 0.8.x. |
| `http.createServer()` | The `http` module is no longer needed, unless you need to directly work with it (socket.io/SPDY/HTTPS). The app can be started by using the `app.listen()` function. |
| `app.configure()` | The `app.configure()` function has been removed. Use the `process.env.NODE_ENV` or `app.get('env')` function to detect the environment and configure the app accordingly. |
| `json spaces` | The `json spaces` application property is disabled by default in Express 4. |
| `req.accepted()` | Use `req.accepts()`, `req.acceptsEncodings()`, `req.acceptsCharsets()`, and `req.acceptsLanguages()`. |
| `res.location()` | No longer resolves relative URLs. |
| `req.params` | Was an array; now an object. |
| `res.locals` | Was a function; now an object. |
| `res.headerSent` | Changed to `res.headersSent`. |
| `app.route` | Now available as `app.mountpath`. |
| `res.on('header')` | Removed. |
| `res.charset` | Removed. |
| `res.setHeader('Set-Cookie', val)` | Functionality is now limited to setting the basic cookie value. Use `res.cookie()` for added functionality. |

## Example app migration

Expand Down
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