Firebase

Functions Commands

Deploy and manage serverless Cloud Functions triggered by Firebase events, HTTP requests, or scheduled jobs. Handle backend logic without managing servers.

8 commands

Pro Tips

Use 'firebase functions:log' to tail function logs in real-time for debugging deployed functions.

Deploy a single function: 'firebase deploy --only functions:functionName' — avoids redeploying all functions.

Set runtime config with 'firebase functions:config:set service.key="value"' for API keys and secrets.

Common Mistakes

functions:config is deprecated for Firebase v2 functions. Use parameterized configuration or Secret Manager instead.

Cold starts add latency. Keep function dependencies minimal and use '--min-instances 1' for latency-critical functions.

Commands

Get function config

$ firebase functions:config:get

Get current function configuration

Set function config

$ firebase functions:config:set service.key="value"

Set environment config for functions

Unset function config

$ firebase functions:config:unset service.key

Remove a function configuration key

Delete function

$ firebase functions:delete <functionName>

Delete a deployed Cloud Function

List functions

$ firebase functions:list

List all deployed Cloud Functions

View function logs

$ firebase functions:log

View Cloud Functions logs

Stream function logs

$ firebase functions:log --follow

Stream Cloud Functions logs in real-time

Functions shell

$ firebase functions:shell

Start interactive functions shell for testing