Easy to use Firebase Emulator setup

Project provides Docker container to run Firebase Emulator locally.

Currently supported features:

• Firebase Auth
• Firebase Database

Feel free to open PR to enable other Firebase features.

Usage

Build Docker container

docker build -t firebase-emulator .

Run

firebase run -p 9099:9099 -p 4000:4000 firebase-emulator

By default it will:

• run Firebase Auth Emulator at http://localhost:9099/,
• run Emulator UI at http://localhost:4000/,
• use demo-project as project ID.

Configuration

Configuration is done via the following env variables:

• FIREBASE_PORT_DATABASE (default: 9000)
• FIREBASE_PORT_AUTH (default: 9099)
• FIREBASE_PORT_UI (default: 4000)
• FIREBASE_PROJECT (default: demo-project)

Client side

Javascript

Server

1. Make sure that you use recent firebase-admin (at last > 9.5.0),
2. Specify FIREBASE_AUTH_EMULATOR_HOST env var as <host>:<port> without (!) protocol prefix,
3. Specify demo-project as project ID:

   import admin from "firebase-admin"
   
   admin.initializeApp({ projectId: "demo-project" })
   

Client

1. Specify FIREBASE_AUTH_EMULATOR_HOST as http://<host>:<port> with (!) protocol prefix

Firebase Database (optional)

Init Firebase project

If you have existing firebase project, you may want to import rules & dataset first.

To do so, you need to have firebase tool to be installed.

First, create some new directory to host your Firebase data and cd into it.

Then, init project by using your existing remote Firebase project:

firebase list
firebase --project <project-id> init database

After this step you should have two files in your directory:

• firebase.json
• database.rules.json

NOTE: if you do not care about actual rules, you can just create empty firebase.json by yourself:

echo '{}' > firebase.json

Then, you need to export your dataset:

firebase --project <project-id> database:get / > database.json

Start Docker container

You need to run this command from same directory as in previous step:

docker run -d -v `pwd`:/firebase -p 9000:9000 -p 9099:9099 -p 4000:4000 firebase-emulator