Express app on Firebase Functions locally - node.js

Question

I created an Express app using Firebase Functions and am hosting the files on Firebase Hosting.
index.js (Firebase Functions):
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const express = require('express');
const parse = require('body-parser');
const cors = require('cors');
admin.initializeApp();
const app = express();
app.use(cors({ origin: true }));
app.use(parse.json());
app.use(parse.urlencoded({ extended: false }));
app.post('/create-url', (req, res) => {
console.log(req.body);
res.send(req.body);
});
exports.app = functions.https.onRequest(app);
firebase.json:
{
"hosting": {
"public": "public",
"ignore": [
"firebase.json",
"**/.*",
"**/node_modules/**"
],
"rewrites": [
{
"source": "**",
"function": "app"
}
]
},
"functions": {
"predeploy": [
"npm --prefix \"$RESOURCE_DIR\" run lint"
]
},
"emulators": {
"functions": {
"port": 5001
},
"firestore": {
"port": 8080
},
"hosting": {
"port": 5000
},
"ui": {
"enabled": true,
"port": 4000
}
}
}
When I make an HTTP request to http://localhost:5000/create-url, req.body is emtpy, but when I make a request to http://localhost:5001/PROJECT_NAME_HERE/us-central1/app/create-url (I've hidden the project name), it works properly. I'm using Postman to make the requests, but it isn't working with my front-end code either :(. If I deploy to Hosting and Functions and access the app through the web.app domain, it works. I'm running firebase emulators:start to run locally.
Thanks in advance for your help!

Answer 1

Check out the bottom section of this page https://firebase.google.com/docs/emulator-suite/install_and_configure. 'Generate an auth token (Hosting emulator only)'.
Basically you have to generate an auth token and pass it as a flag in your build script or add it to your ci environment variables.
Let me know if it helps!