Question 120187 in Firebase Question posted in
An extensive official documentation can be found here.

Firebase – Getting two error's in nodejs using express

(I know this has a bad title)
I’m using firebase and express for this project but this doesn’t work.

src/index.js

import { initializeApp } from "firebase/app";
import { doc, getFirestore } from "firebase/firestore";
import { collection, addDoc, getDoc } from "firebase/firestore";
import Chance from "chance";
import express from 'express';
import bodyParser from 'body-parser';

var jsonParser = bodyParser.json();

var urlencodedParser = bodyParser.urlencoded({ extended: false });

var chance = new Chance();
const expressApp = express();

expressApp.set('view engine', 'ejs');

expressApp.get('/', (req, res) => {
    console.log("hello");
    res.render('index');
});

expressApp.post('/add', jsonParser, (req, res) => {
    add(req.body.name);
    res.send(`You said ${req.body.name}`);
    res.status(200);
});


const firebaseConfig = {
    apiKey: "apikey",

    authDomain: "authDomain",

    projectId: "projectId",

    storageBucket: "storageBucket",

    messagingSenderId: "messagingSenderId",

    appId: "appId",

    measurementId: "measurementId"

};

// Initialize Firebase
const app = initializeApp(firebaseConfig);


// Initialize Cloud Firestore and get a reference to the service
const db = getFirestore(app);


async function add(firstName) {
    try {
        const docRef = await addDoc(collection(db, "users"), {
            first: firstName,
            last: chance.last(),
            born: chance.year({ min: 1920, max: 2000 }),
        },);
        console.log("Document written with ID: ", docRef.id);
    } catch (e) {
        console.error("Error adding document: ", e);
    }
}



expressApp.listen(3000);

//add();

(Everything in the firebase config is actually there in my real js file)

src/views/index.ejs

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
    </head>
    <body>
        <input id="input" type="text" />
        <button>Submit</button>
    </body>
    <script>
        document.querySelector("button").addEventListener("click", function () {
            const input = document.getElementById("input");
            fetch("/add", {
                method: "post",
                body: {
                    name: input.value,
                },
            })
                .then((response) => response.json())
                .then((data) => console.log(data));
        });
    </script>
</html>

In my terminal I’m getting this error

Error adding document: [FirebaseError: Function addDoc() called with invalid data. Unsupported field value: undefined (found in field first in document users/VI9jpmKrASca4PhrTxYC)] {
code: ‘invalid-argument’,
customData: undefined,
toString: [Function (anonymous)] }

and in my console(firefox) Im getting this

Uncaught (in promise) SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

also if I use insomnia or rest clinet and pass in an object like
{
"name":"hello",
}
it works properly

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    I found out how to do it!

    So for some reason if I put const data = { name: input.value } and put body: JSON.stringify(data) it works properly

    Thanks to everyone who tried to help me


  2. 0

    The error message:

    Unsupported field value: undefined (found in field first in document users/VI9jpmKrASca4PhrTxYC)]

    Is telling you that the document field named first contains undefined, which is invalid in Firestore. You will need to make sure that you pass a correct value when you call addDoc.

    We can’t debug this for you because we can’t see the value of req.body.name that you’re using here:

    add(req.body.name);
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search