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NodeJS : The default Firebase app does not exist. Make sure you call initializeApp() before using an
Introducing Firebase App Check
JavaScript : Check if value exists in firebase DB
JavaScript : How to check if a cloud firestore document exists when using realtime updates
NodeJS : Node, firebase functions Property 'map' does not exist on type 'Promise QuerySnapshot
NodeJS : Error: The default Firebase app already exists. Really
NodeJS : Firebase App named '[DEFAULT]' already exists & google firebase reference does not work on
NodeJS : firebase functions Property 'data' does not exist on type 'Change DataSnapshot '
NodeJS : This document does not exist, it will not appear in queries or snapshots Cloud Firestore
Node Tutorial: How to check if files and directories exist.
NodeJS - How to Check if a File Exists
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Last Updated: August 16, 2026
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![NodeJS : Firebase App named '[DEFAULT]' already exists & google firebase reference does not work on](https://i.ytimg.com/vi/w4UXqhoauDM/mqdefault.jpg)
