Error: The variable 'err' is not declared in this scope.at line app.post

Tools I am Using

Situation Description

I attempted to make a post request using Postman for testing purposes, but it is not working (Get requests are working fine). Does anyone know what might be causing this error? I have tried the test multiple times but the post function is not functioning correctly.

Console Output in Visual Studio 

 functions: Finished "api" in ~1s
>  (node:28624) UnhandledPromiseRejectionWarning: Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
...
(Truncated for brevity)

Desired Outcome

I want to successfully create a data entry in Firestore by posting from Postman.

Index.js Code Snippet

const functions = require('firebase-functions');

// Firebase Admin SDK
const admin = require('firebase-admin');
admin.initializeApp();

const express = require('express');
const app = express();

app.get('/screams', (req, res) => {
...
});

exports.api = functions.https.onRequest(app);

app.post('/scream',(req, res) => {
...
});

My Cloud Firestore Database Snapshot

https://i.stack.imgur.com/RRWO1.png

Postman Test Screenshot

https://i.stack.imgur.com/u0irW.png

javascriptexpressgoogle-cloud-firestoregoogle-cloud-functionspostman

Answer №1

I was able to resolve the issue, however, I am unsure of why it occurred in the first place.

Recommended Solution:

  1. Try deleting the Firestore database and creating a new one

  2. Deploy Firebase again

  3. Serve Firebase

  4. Retest using Postman

  5. If everything is working as expected, then the issue has been resolved successfully

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