Express.js req.body undefined

Question

I have this as configuration of my Express server

app.use(app.router); 
app.use(express.cookieParser());
app.use(express.session({ secret: \"keyboard cat\" }         


        

Answer 1

No. You need to use app.use(express.bodyParser()) before app.use(app.router). In fact, app.use(app.router) should be the last thing you call.

Answer 2

I solved it with:

app.post('/', bodyParser.json(), (req, res) => {//we have req.body JSON
});

Answer 3

If you are using some external tool to make the request, make sure to add the header:

Content-Type: application/json

Answer 4

Looks like the body-parser is no longer shipped with express. We may have to install it separately.

var express    = require('express')
var bodyParser = require('body-parser')
var app = express()

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }))

// parse application/json
app.use(bodyParser.json())

// parse application/vnd.api+json as json
app.use(bodyParser.json({ type: 'application/vnd.api+json' }))
app.use(function (req, res, next) {
console.log(req.body) // populated!

Refer to the git page https://github.com/expressjs/body-parser for more info and examples.

Answer 5

Use app.use(bodyparser.json()); before routing. // . app.use("/api", routes);

Answer 6

You can try adding this line of code at the top, (after your require statements):

app.use(bodyParser.urlencoded({extended: true}));

As for the reasons as to why it works, check out the docs: https://www.npmjs.com/package/body-parser#bodyparserurlencodedoptions