ERR_HTTP_HEADERS_SENT: Cannot set headers after they are sent to the client

Question

I\'m facing this weird issue in NodeJS when using with Passport.js, Express and Mongoose. Basically, I get an error saying \"Cannot set headers after they are sent to the cl

Answer 1

you have to enable Promises in your programm, in my case i enabled it in my mongoose schema by using mongoose.Promise = global.Promise . This enables using native js promises.

other alternatives to this soloution is :

var mongoose = require('mongoose');
// set Promise provider to bluebird
mongoose.Promise = require('bluebird');

and

// q
mongoose.Promise = require('q').Promise;

but you need to install these packages first.