Increase body limit for specific route with ExpressJS - node.js

Question

We have a REST API built with ExpressJS. One of our routes is getting files as binary data in the JSON request body. Therefore we want to increase the limit of the body.
Simple version of our starting index.js file
const start = async () => {
try {
// Connect to database
await connectDB(process.env.DATABASE_URL);
// Create app
const app = express();
// Body parser
app.use(express.json()); //100kb default
app.use(express.urlencoded({ extended: true }));
// Mount routes
app.use(`/${process.env.API_VERSION}`, authRoutes);
app.use(`/${process.env.API_VERSION}`, profileRoutes);
app.use(`/${process.env.API_VERSION}`, filesRoutes);
app.use(`/${process.env.API_VERSION}`, ticketRoutes);
// Error handler
app.use(errorHandler);
// Not found handler
app.use(notFoundHandler);
// Start server
const server = app.listen(process.env.PORT, () => {
console.log(`Server running in ${process.env.NODE_ENV} mode on http://${process.env.HOST}:${process.env.PORT}/${process.env.API_VERSION}`)
});
} catch(error) {
console.log(error);
}
}
start();
At this point the limit for all routes is 100kb.
Inside our filesRoutes we have 1 specific upload route where we want to increase this limit to 200mb.
import express from 'express';
import { uploadFiles, getFiles, downloadFile, deleteFile } from '../controllers/filesController.js';
import authorize from '../middleware/authorizeHandler.js';
const router = express.Router();
router.get('files', authorize, getFiles);
router.get('files/:id/download', authorize, downloadFile);
router.post('files/upload', [authorize, express.json({ limit: '200mb' })], uploadFile);
router.delete('files/:id', authorize, deleteFile);
export default router;
I added express.json({ limit: '200mb' }) to the upload route but I'm getting an error back request entity too large.

Answer 1

Based on #vighnesh153 comment we could fix the issue by changing app.use(express.json()); to app.use(/^(?!\/api\/files\/upload$)/, express.json()); and add express.json({ limit: '200mb' }) as middleware to the api/files/upload route