functions-samples

This repository is a collection of example projects for Cloud Functions for Firebase, published by Google. Cloud Functions is a service that lets you run small pieces of code on Google's servers in response to events, without setting up or managing your own server. Firebase is Google's platform for building mobile and web applications, and Cloud Functions connects to its various services.

The examples are organized by trigger type, which is the kind of event that causes a function to run. A trigger might be a user uploading a file to cloud storage, a document being written to a database, a new user account being created, an incoming web request, or a scheduled timer. Each sample shows a small, self-contained piece of code that responds to one of these triggers and does something useful with it.

The sample collection covers a wide range of practical use cases. Image processing examples show how to automatically generate thumbnails, convert image formats, or blur inappropriate content when a file is uploaded. Database examples show how to keep counts up to date, delete old records automatically, or keep data in sync across different parts of Firebase. Authentication examples show how to send welcome or farewell emails when users join or leave, or validate a user's email before allowing them to sign in. Other samples cover sending notifications to mobile devices, calling external APIs, using AI models to analyze text or images, and integrating with third-party services like Slack, PayPal, and Stripe.

Samples are available in both JavaScript (Node.js) and Python, and most support both the first and second generation of Cloud Functions. The README notes that Python support is currently in public preview, meaning it may still change. Deploying any of these samples requires a Firebase project with the Blaze pay-as-you-go billing plan enabled, as Cloud Functions does not run on the free tier when deployed to production.

This repository is intended as a learning and reference resource, not as a ready-to-deploy application. Each subdirectory contains its own README with setup and deployment instructions for that specific example.