Getting Error Code 400 ( Bad Request ) when trying to add a document in firebase firestore

[Shailendra1703]

I'm working on a simple Nextjs application having some CRUD operation with firebase firestore database , I'm using zustand for state mangement but when I'm trying to add the document I'm getting the error code 400 ( Bad request ) in the console ( image attached below )

Here is the code

firebase.js file

import { initializeApp, getApps, getApp } from "firebase/app";
import { getFirestore } from "firebase/firestore";
import { getStorage } from "firebase/storage";

const firebaseConfig = {
  apiKey: process.env.NEXT_PUBLIC_FIREBASE_API_KEY,
  authDomain: process.env.NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN,
  projectId: process.env.NEXT_PUBLIC_FIREBASE_PROJECT_ID,
  storageBucket: process.env.NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET,
  messagingSenderId: process.env.NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID,
  appId: process.env.NEXT_PUBLIC_FIREBASE_APP_ID,
};

const app = !getApps().length ? initializeApp(firebaseConfig) : getApp()[0];
const db = getFirestore(app);
const storage = getStorage(app);

export { app, db, storage };

Zustand State Mangement file

"use client";

import { create } from "zustand";
import { collection, addDoc, getDocs } from "firebase/firestore";
import { db, storage } from "@/config/firebase";

const useFirestoreStore = create((set) => ({
  documents: [],
  isLoading: false,
  error: null,

  addDocument: async (collectionName, data) => {
    set({ isLoading: true, error: null });
    try {
      const docRef = await addDoc(collection(db, collectionName), data);
      set((state) => ({
        documents: [...state.documents, { id: docRef.id, ...data }],
        isLoading: false,
      }));
    } catch (error) {
      set({ error: error.message, isLoading: false });
    }
  },

  getDocuments: async (collectionName) => {
    set({ isLoading: true, error: null });
    try {
      const querySnapshot = await getDocs(collection(db, collectionName));
      const docs = querySnapshot.docs.map((doc) => ({
        id: doc.id,
        ...doc.data(),
      }));
      set({ documents: docs, isLoading: false });
    } catch (error) {
      set({ error: error.message, isLoading: false });
    }
  },
}));

export default useFirestoreStore;

A simple form

"use client";

import React, { useState } from "react";
import useFirestoreStore from "@/store/firestore";
import { db } from "@/config/firebase";
export default function Home() {
  const { documents, isLoading, error, addDocument, getDocuments } =
    useFirestoreStore();
  const [formData, setFormData] = useState({ name: "", age: "" });

  const handleAddDocument = async () => {
    if (!formData.name || !formData.age) {
      alert("Please fill in all fields");
      return;
    }
    await addDocument("users", {
      name: formData.name,
      age: parseInt(formData.age, 10),
    });
    setFormData({ name: "", age: "" }); // Reset form
  };

  const handleInputChange = (e) => {
    const { name, value } = e.target;
    setFormData((prevState) => ({ ...prevState, [name]: value }));
  };

  return (
    <div>
      {isLoading && <p>Loading...</p>}
      {error && <p>Error: {error}</p>}
      <form onSubmit={(e) => e.preventDefault()}>
        <label>
          Name:
          <input
            type="text"
            name="name"
            value={formData.name}
            onChange={handleInputChange}
          />
        </label>
        <label>
          Age:
          <input
            type="number"
            name="age"
            value={formData.age}
            onChange={handleInputChange}
            className="text-black"
          />
        </label>
        <button type="button" onClick={handleAddDocument}>
          Add User
        </button>
      </form>
    </div>
  );
}

Here are my Firebase firestore Rules

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if true;
    }
  }
}

GitHub Repo >> https://github.com/Shailendra1703/fb

[dennismunene]

Seeing the same issue did you find a fix? @Shailendra1703

[0xGoenka]

I'm also using firebase inside a chrome extension which is my second guess, will update when I resolve

[dennismunene]

I changed how I initialized my db object from const db = getFirestore(app') to const db = getFirestore(app,'my_collection') and It started working.

[0xGoenka]

Yeah, my problem was a renamed my DB name when I created it, and so it was not the default name : (default) which is what caused the problem on my side, after creating a new db with default name everything worked lol,

Would be nice if they had meaningfull error message

[Shailendra1703]

@dennismunene Hey hii, in my case the culprit was a comma inside my env variables, which I came to now recently, due to which my app was not Initializing.

[alexandreomiranda]

@0xGoenka saved the day. I was trying to find a solution to this for two days. Creating a new DB with (default) name made it work. Agreed, no meaningfull error message at all.

[FPan7792]

Be blessed @dennismunene ! I spent my 3 last days refactoring my code from A to Z thinking I was going to become crazy and losing every piece of trust in my debugging skills until I finally found your solution . This is crazy to realize this details isn't mentioned anywhere easily in firestore docs

[tvadiep]

@dennismunene Hey hii, in my case the culprit was a comma inside my env variables, which I came to now recently, due to which my app was not Initializing.

really really appreciate, you saved me

[jaxazam]

I changed how I initialized my db object from const db = getFirestore(app') to const db = getFirestore(app,'my_collection') and It started working.

I had the same issue for last 3 days and this is what worked for me; needing to explicitly reference the database during getFirestore() initialization. Tysm!

[moza88]

They moved to google cloud and it seems like now we have to deal with service accounts. https://firebase.google.com/docs/firestore/quickstart#node.js

This is what they have in their docs:

const serviceAccount = require('./path/to/serviceAccountKey.json');

initializeApp({
  credential: cert(serviceAccount)
});

const db = getFirestore();

[dlarocque]

Hi @moza88, I am looking into this for my own understanding.

This is what they have in their docs:

const serviceAccount = require('./path/to/serviceAccountKey.json');

initializeApp({
  credential: cert(serviceAccount)
});

const db = getFirestore();

Where exactly did you find this code snippet? I can't find it in the Firebase documentation, and it's not at the page you linked.

[Shailendra1703]

Hello @dlarocque , few days back I was working on some app where I need to send json data to firestore, then I asked claude sonnet the new AI model, which also gave me this code snippet. Might be possible he got it from there not sure tbh.

[ChamodKalupahana]

I created a firestore default database but I kept getting 400 requests errors when I tried to connect with my app. I thought it was because i set my database location to be europe but my functions and hosting in was us.

But in the end, i just had to define my database name when i get firestore.

const app = initializeApp(firebaseConfig);

const db = getFirestore(app, "default");

I tried debugging for hours with ChatGPT 4o but it didn't know the, it kept telling me to create a datastore database, or change the host name to eur. Hopefully this helps some people and firebase can add some error messages for this kind of error.

[blind675]

The solution for me was to add the database nema in the getFirestore init function like:

const db = getFirestore(app, "<the database name>");

It seems that it doesn't work with "default" so you need to name your db when you create it.