Angular 7 Headers aren't getting set

Question

I'm using Angular 7 and created a interceptor to include auth token in every request.

Here is my interceptor code:

import { Observable } from 'rxjs';

import { Injectable } from '@angular/core';
import { HttpInterceptor, HttpRequest, HttpHandler, HttpEvent } from '@angular/common/http';

@Injectable()
export class JwtInterceptor implements HttpInterceptor {
  constructor() { }

  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    const token = localStorage.getItem('authToken');
    if (token) {
      request = request.clone({
        setHeaders: {
          authorization: token
        }
      });
    }
    return next.handle(request);
  }
}

The node api to verify auth token:

const jwt = require('jsonwebtoken');

function verifyToken(req, res, next) {
    var token = req.headers['authorization']; // Coming Undefined 
    if (!token)
        return res.status(403).send({ auth: false, message: 'No token provided.' });
    jwt.verify(token, 'top_secret', function (err, decoded) {
        if (err)
            return res.status(500).send({ auth: false, message: 'Failed to authenticate token.' });
        // if everything good, save to request for use in other routes
        req.userId = decoded.user.email;
        next();
    });
}

module.exports = verifyToken;

When hitting the API with Postman things are working fine but when sent a request using angular code the headers aren't received at node API.

What could be the possible reason for this kind of strange behavior?

Answer 1

The screenshot you are showing is for a OPTIONS request, required for CORS. You need to enable CORS in nodejs

First, install the cors module

npm install cors

Then use it in your nodejs backend

var cors = require('cors');
app.use(cors());