Firebase Functions - cannot read req.body - node.js

Question

I'm having a problem with my Firebase Functions https request.
This is my code to trigger it:
const express = require('express');
const bodyParser = require('body-parser');
const app = express();
app.use(bodyParser.json());
app.use(function(req, res, next) {
res.setHeader('Content-Type', 'application/json');
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
res.header("Access-Control-Allow-Methods", "GET, POST");
next();
});
app.use((err, req, res, next) => {
if (err instanceof SyntaxError) {
return res.status(400).send();
};
next();
});
app.post('/fetchPosts', (req, res) => {
exports.fetchPosts(req, res);
});
exports.widgets = functions.https.onRequest(app);
const cors = require('cors')({ origin: true })
exports.fetchPosts = (req, res) => {
console.log(req.body)
console.log(res)
let topics = req.body.topics || ['live'];
let start = req.body.start || 0;
let num = req.body.num || 10;
let next = start+num;
// setting up the response.
});
That looks good as far as I can tell..
Now when I do my api call I do:
var headers = new Headers();
headers.append('Content-Type', 'application/x-www-form-urlencoded');
headers.append('Content-Type', 'application/json; charset=UTF-8');
const request = new RequestOptions({ headers: headers });
const url = 'https://my-link.cloudfunctions.net/widgets/fetchPosts';
let payload = {
topics: ["live", "pets"]
}
console.log(JSON.stringify(payload))
this.http.post(url, JSON.stringify(payload), request)
.pipe(map((res:Response) => {
console.log(res.json())
}))
.subscribe(
data => console.log(data),
err => console.log(err),
() => console.log('Got feed')
);
and it just returns topics with just ['live'].. because of the failsafe that I set up on the backend.. but why isn't getting my topics that I'm sending?
Also, when I console.log(req.body) on the backend it just shows {}.. an empty object..
Any ideas why the req.body doesn't seem to work? I do it with start and num as well, but they all revert back to the failsafe.

Answer 1

You must use POST method to handle req.body . In your case, you can handle your variable with req.query
To handle req.body . You can use Postman, then select POST method and post data as JSON . You can read more to use Postman well.