How to Resolve the \'Request Entity Too Large\' Error in Express.js?

Error: Request Entity Too Large

This error occurs when a request body exceeds the allowable size limit. Express provides the express.limit() method to set this limit. However, sometimes the limit is not correctly enforced.

Solution:

1. Set the Limit Explicitly

Ensure that express.limit() is called explicitly and placed before other middleware that might alter the request body, such as express.json() or express.urlencoded().

app.use(express.limit('50mb'));

2. Update Body Parser with body-parser

In Express 4, the body-parser middleware should be used instead of express.json() and express.urlencoded().

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

3. Patch the Module Temporarily

As a temporary solution, you can edit the raw-body module and set the limit manually. This is not recommended, as it will be overwritten during module updates.

// In node_modules/express/node_modules/connect/node_modules/raw-body/index.js
limit = 52428800; // For 50mb

4. Use Latest Express Version

In Express v4.16.0 and above, the limit can be set without explicitly using body-parser.

app.use(express.json({limit: '50mb'}));
app.use(express.urlencoded({limit: '50mb'}));

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