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

Error: request entity too large

Express users encounter this error when posting large JSON arrays. The message indicates that the request entity exceeds the allowed size limit. Let's investigate the issue and explore possible solutions.

The initial troubleshooting involves setting the request size limit using app.use(express.limit(100000000)). However, this approach doesn't seem to resolve the issue.

A deeper dive into the Express code reveals that the limit is initially set to 1mb, but then gets reset somewhere along the process. To address this, a temporary patch can be applied by manually setting the limit, but it's not a permanent solution.

The proper solution lies in explicitly declaring the bodyParser parsers in the order they should be executed. In Express 4 or above, use app.use(express.json({limit: '50mb'})) and app.use(express.urlencoded({limit: '50mb', extended: true})) to set the limit for JSON and URL-encoded requests, respectively. The extended option is required for multipart uploads.

In Express v4.16.0 and later, you can revert to the initial approach of using express.json() and express.urlencoded() to set the request size limit.

By implementing these solutions, you can overcome the "request entity too large" error and handle large JSON arrays in your Express applications effectively.

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