CODEWITHSUNDEEP
node.jsexpressmiddleware
flow24
flow24

Reputation: 943

Express middleware issue callback issue

I got this middleware.

const validateInput = (req, res, next) => {
 return console.log(req.body);
};

When I run my server I get this error:

Error: Route.post() requires a callback function but got a [object Undefined]

If I change the middleware to return a function like so:

const validateInput = (req, res, next) => {
 return () => console.log(req.body);
};

It runs but the console.log print undefined.

What am I missing about express rules here? (To be clear, the middleware before this one does have a next() that should pass req)

Upvotes: 0

Views: 298

Answers (2)

Danizavtz
Danizavtz

Reputation: 3270

You will need to use a body-parser middleware from express before you can access the body parsed version of your request body.

Just before handling your routes.

app.js

const express = require('express');
const app = express();

app.use(express.json()); //<-- you will need express.json() middleware

app.use(require('./server/index')); //<-- here my routes middlewares are declared.

module.exports = app;

Upvotes: 0

Md Misbauddin Chowdhury
Md Misbauddin Chowdhury

Reputation: 614

Why did you return? if you could give route section that would be great to debug.

if you use like this?

  const middleware = (req, res, next) => {
    console.log(req.body)
    next();
  };
  route.get('/' middleware, controller);

Upvotes: 1

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