How to Fix the \'Error: request entity too large\' in Express.js?

Troubleshooting "Error: request entity too large" in Express

Express users may encounter the "Error: request entity too large" error when handling large payloads. This issue arises when the incoming request exceeds the configured size limit.

Setting the Request Size Limit

To resolve this issue, users can adjust the request size limit using the app.use(express.limit(size)) middleware. In the provided example, the limit is set to 100,000,000 octets.

Verifying the Content-Length Header

Ensure that the Content-Length header in Fiddler matches the size of the JSON array being posted. In this case, the header shows a value of 1078702 octets, which is equivalent to 1.0787 megabytes.

Potential Solution

One possible solution is to use app.use(express.bodyParser({limit: '50mb'})) instead of app.use(express.limit(size)). This approach has been reported to work for some users.

Temporary Patch

If the above solutions fail, a temporary patch can be applied by modifying the raw-body module directly. By adding limit = 52428800; on line 10 of node_modules/express/node_modules/raw-body/index.js, the limit will be forced to 50 megabytes. Note that this is a temporary workaround and not a permanent solution.

Recommended Solution

For a more robust solution, it is recommended to use the body-parser module with Express 4 or later. The following code snippet illustrates how to configure the body size limit:

const bodyParser = require('body-parser');
app.use(bodyParser.json({limit: '50mb'}));
app.use(bodyParser.urlencoded({limit: '50mb'}));

Additional Notes:

• Avoid using bodyParser() as it is deprecated.
• Use the extend option for urlencoded() in Express 3.x.
• In Express 4.16.0 and above, the previous method for setting the limit (app.use(express.json({limit: '50mb'}))) is supported again.

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