This repository contains a collection of samples showcasing some typical uses of Cloud Functions for Firebase.

Cloud Functions is a hosted, private, and scalable Node.js environment where you can run JavaScript code. Cloud Functions for Firebase integrates the Firebase platform by letting you write code that responds to events and invokes functionality exposed by other Firebase features.

To learn how to get started with Cloud Functions for Firebase by having a look at our Getting Started Guide, trying the quickstart samples and looking at the documentation.

This repository contains a few categories of samples:

1. Quickstarts are minimal examples for each types of triggers.
2. Development Environment Samples and Boilerplates illustrates how to get started with different, commonly used JavaScript development patterns such as Typescript, React SSR, ES2017 etc...
3. Image Processing shows a few ways where you can process and transform images using Cloud Functions such as generating thumbnails, converting images extracting metadata...
4. Firebase Realtime Database Data Consistency shows how to implement automatic data consistency such as keeping a count of children, having a max amount of node childs, cleaning up old data etc... for your Realtime Database.
5. Other common usecases a set of other common usecases for Cloud Functions.

Here is a set of minimal samples for each Cloud Functions trigger types.

This quickstart sample demonstrates using Cloud Functions triggered by Firebase Realtime Database or Cloud Firestore events. The function transforms message text written to Firestore to uppercase.

This quickstart sample demonstrates using Cloud Functions triggered by HTTPS requests. The function returns the current server time and allows for date time formatting.

This quickstart demonstrates using Cloud Functions with an HTTPS trigger that's triggered through a Firebase Hosting URL. The function will display a repeated number of "BONG"s depending on the hour of the day.

This quickstart sample demonstrates using Cloud Functions triggered by Firebase Storage events. The function generates a thumbnail of uploaded images.

This quickstart sample demonstrates using Cloud Functions triggered by Firebase Auth events. The function sends a Welcome Email when user accounts are created (or when users sign-in using an Identity Provider for the first time) and sends a Goodbye Email when user accounts are deleted.

This quickstart sample demonstrates using Cloud Functions triggered by PubSub events. The functions log the PubSub payload in a Hello world message.

This quickstart sample demonstrates using Cloud Functions triggered by Crashlytics. The functions send an email when there is a new issue in an important conversion flow.

The Firebase CLI generates sample code for Cloud Functions using JavaScript that is natively supported in NodeJS. Most developers use more modern JavaScript or TypeScript which requires additional tools.

This sample shows how you can write your Cloud Functions code using Typescript. This requires a build step, included as an npm script, which transpiles the source code to a supported version of JavaScript. Uses an HTTPS request.

This sample shows how to serve server-side generated HTML pages using the HandlebarsJs templating system and serve user-specific content by always passing the Firebase ID token in a __session cookie.

This sample demonstrates how to create an isomorphic React application with server-side data fetching. This sample uses Cloud Functions, Hosting, and the Realtime Database.

Here is a few sample that shows how you can process or analyze images using Cloud Functions.

This sample demonstrates how to create various customized images such as sparkline or sphere charts through Cloud Functions and Hosting and serve it to the client. Uses an HTTP trigger.

Demonstrates how to automatically convert images that are uploaded to Firebase Storage to JPEG using ImageMagick. Uses a Firebase Storage trigger.

Demonstrates how to automatically generate a thumbnail for images that are uploaded to Firebase Storage using ImageMagick and generate a public download link for the images. Uses a Firebase Storage trigger.

Demonstrates how to use Node.js Stream to read image from Cloud Storage, generate a thumbnail image using Sharp and upload it back to Cloud Storage. Uses a Firebase Storage trigger.

Demonstrates how to automatically moderate offensive images that are uploaded to Firebase Storage by using the Google Cloud Vision API to detect offensive images and ImageMagick to blur these images. Uses a Firebase Storage trigger.

Demonstrates how to automatically extract image's metadata using ImageMagick for images that are uploaded to Firebase Storage. Uses a Firebase Storage trigger.

These samples show how to implement automatic data consistency such as keeping a count of children, having a max amount of node childs, cleaning up old data etc...

Tracking when the Firebase Database (or a subset) was last modified. Uses a Realtime Database trigger.

Keeps track of the number of child nodes of a Firebase Database element allowing clients to filter or order results using the child count. This can be useful to keep track of the number of "likes" or "followers" of something shared through social media. Uses a Realtime Database trigger.

Makes sure that the number of child nodes stays below a certain threshold. This can be useful to limit the number of lines of logs or chat history below a given number. Uses a Realtime Database trigger.

This sample shows how to remove child nodes older than 2 hours from a Firebase Database list. This can be useful for removing outdated items from a collection. Uses a Realtime Database trigger.

This sample demonstrates how to send a Firebase Cloud Messaging (FCM) notification from a Realtime Database triggered Function when users get new followers. The sample also features a Web UI to experience the FCM notification. Uses a Realtime Database trigger.

This sample shows how to create an action for the Google Home/Assistant using the Actions SDK hosted on Cloud Functions. The sample action asks users to say a number and reads out the ordinal of that number. Uses an HTTP trigger.

This sample shows how to authenticate access to a JSON API to only allow access to data for a specific Firebase user. Uses an HTTP trigger.

This sample shows how to restrict an HTTPS Function to only the Firebase users of your app. Only users who pass a valid Firebase ID token as a Bearer token in the Authorization header of the HTTP request or in a __session cookie are authorized to use the function. Checking the ID token is done with an ExpressJs middleware that also passes the decoded ID token in the Express request object. Uses an HTTP trigger.

Demonstrates how to authorize with a 3rd party sign-in mechanism, create a Firebase custom auth token, update the user's profile and authorize Firebase. Uses an HTTP trigger.

Demonstrates how to automatically post GitHub commits to a Slack channel using an HTTPS triggered Function.

Demonstrates hows to integrate Firebase Auth and the Realtime database with Stripe via the Stripe Node.js library and shows how to create HTTP endpoints to charge customers via Paypal.

Demonstrates how to moderate user input text for bad words. This can be used to moderate usernames, chat or forum messages. Uses a Realtime Database trigger.

Sends email confirmation after users subscribed to a mailing list. Uses a Realtime Database trigger.

Integrates the Google Translate API to perform automatic text translation across any number of languages. Language codes can be stored in Firebase for on the fly changes. Uses a Realtime Database trigger.

Integrates the Bit.ly API to shorten URLs automatically as they are added to the database. Uses a Realtime Database trigger.

Enable full-text search on Firebase Database data or Cloud Firestore documents by using an Algolia hosted search service. Uses a Realtime Database or Cloud Firestore trigger.

Deletes all associated user data in the Realtime database when a user deletes his Firebase account. Uses an Auth trigger. This code has moved to its own repo at https://github.com/firebase/user-data-protection

This sample demonstrates how to sync new data written to a Firebase database to a Google Sheet. It includes a method for obtaining, storing, and using Oauth2 tokens for Google API access. Uses HTTPS triggers and Realtime Database triggers.

Copies Firebase Database elements into BigQuery automatically. This can be useful for instance for further logs analysis. Uses a Realtime Database trigger.

Writing to the Firebase Database triggers a request to a callback URL (a Webhook). The content of the modified Data is sent to the Webhook. Uses a Realtime Database trigger.

This sample shows how to send a survey to your users who have updated your app. App Update is detected using a Firebase Analytics event. Uses an Analytics trigger.

This sample shows how to send a coupon to your users who have just purchased something. 10% off on your next purchase! Uses an Analytics trigger.

Periodically deletes the accounts of users who have not signed in in the last month. Uses an HTTPS trigger.

This sample demonstrates how to send a Firebase Cloud Messaging (FCM) notification to the developer device each time your app gains or loses a user. Uses an Analytics trigger.

This sample uses ffmpeg / fluent-ffmpeg and automatically converts audio files that are uploaded to Cloud Storage to FLAC file format with mono-channel audio @ 16000hz. Uses a Storage trigger.

Build a simple online / offline status indicator for your users by leveraging Cloud Firestore and Realtime Database together. Uses a Realtime Database trigger.

Automatically creates a new issue in your Jira project when a new issue is reported in Crashlytics. Uses a Crashlytics trigger.

Automatically sends a Slack notification to a specific Slack channel when a new issue is reported in Crashlytics. Uses a Crashlytics trigger.

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