| name | firebase-ai-logic-basics |
| description | Official skill for integrating Firebase AI Logic (Gemini API) into web applications. Covers setup, multimodal inference, structured output, and security. |
| version | 1.0.1 |
Firebase AI Logic Basics
Overview
Firebase AI Logic is a product of Firebase that allows developers to add gen AI
to their mobile and web apps using client-side SDKs. You can call Gemini models
directly from your app without managing a dedicated backend. Firebase AI Logic,
which was previously known as "Vertex AI for Firebase", represents the evolution
of Google's AI integration platform for mobile and web developers.
It supports the two Gemini API providers:
- Gemini Developer API: It has a free tier ideal for prototyping, and
pay-as-you-go for production
- Vertex AI Gemini API: Ideal for scale with enterprise-grade production
readiness, requires Blaze plan
Use the Gemini Developer API as a default, and only Vertex AI Gemini API if the
application requires it.
Setup & Initialization
Prerequisites
- Before starting, ensure you have Node.js 16+ and npm installed. Install
them if they aren’t already available.
- Identify the platform the user is interested in building on prior to starting:
Android, iOS, Flutter or Web.
- If their platform is unsupported, Direct the user to Firebase Docs to learn
how to set up AI Logic for their application (share this link with the user
https://firebase.google.com/docs/ai-logic/get-started)
Installation
The library is part of the standard Firebase Web SDK.
npm install -g firebase@latest
If you're in a firebase directory (with a firebase.json) the currently selected
project will be marked with "current" using this command:
npx -y firebase-tools@latest projects:list
Ensure there's at least one app associated with the current project
npx -y firebase-tools@latest apps:list
Initialize AI logic SDK with the init command
npx -y firebase-tools@latest init ailogic
This will automatically enable the Gemini Developer API in the Firebase console.
More info in
Firebase AI Logic Getting Started
Core Capabilities
Text-Only Generation
Multimodal (Text + Images/Audio/Video/PDF input)
Firebase AI Logic allows Gemini models to analyze image files directly from your
app. This enables features like creating captions, answering questions about
images, detecting objects, and categorizing images. Beyond images, Gemini can
analyze other media types like audio, video, and PDFs by passing them as inline
data with their MIME type. For files larger than 20 megabytes (which can cause
HTTP 413 errors as inline data), store them in Cloud Storage for Firebase and
pass their URLs to the Gemini Developer API.
Chat Session (Multi-turn)
Maintain history automatically using startChat.
Streaming Responses
To improve the user experience by showing partial results as they arrive (like a
typing effect), use generateContentStream instead of generateContent for
faster display of results.
Generate Images with Nano Banana
- Start with Gemini for most use cases, and choose Imagen for specialized tasks
where image quality and specific styles are critical. (Example:
gemini-2.5-flash-image)
- Requires an upgraded Blaze pay-as-you-go billing plan.
Search Grounding with the built in googleSearch tool
Supported Platforms and Frameworks
Supported Platforms and Frameworks include Kotlin and Java for Android, Swift
for iOS, JavaScript for web apps, Dart for Flutter, and C Sharp for Unity.
Advanced Features
Structured Output (JSON)
Enforce a specific JSON schema for the response.
On-Device AI (Hybrid)
Hybrid on-device inference for web apps, where the Firebase Javascript SDK
automatically checks for Gemini Nano's availability (after installation) and
switches between on-device or cloud-hosted prompt execution. This requires
specific steps to enable model usage in the Chrome browser, more info in the
hybrid-on-device-inference documentation.
Security & Production
App Check
[!WARNING]
Critical Safety Requirement: In order to use AI Logic safely, you MUST set
up App Check on your app. This prevents unauthorized clients from using your
API quota and accessing your backend resources.
See
App Check with reCAPTCHA Enterprise
for setup instructions.
Remote Config
Consider that you do not need to hardcode model names (e.g.,
gemini-flash-lite-latest). Use Firebase Remote Config to update model versions
dynamically without deploying new client code. See
Changing model names remotely
[!WARNING]
CRITICAL: Backend Provisioning Required For all platforms (Flutter,
Android, iOS, Web), you MUST run npx firebase-tools init ailogic to
provision the service. flutterfire configure ONLY handles client
configuration and does NOT enable the AI service, leading to
PERMISSION_DENIED errors.
Initialization Code References
| Language, Framework, Platform | Gemini API provider | Context URL |
|---|
| Web Modular API | Gemini Developer API (Developer API) | firebase://docs/ai-logic/get-started |
| iOS (Swift) | Gemini Developer API | ios_setup.md |
| Flutter (Dart) | Gemini Developer API | flutter_setup.md |
**Always use the most recent version of Gemini (gemini-flash-latest) unless
another model is requested by the docs or the user. DO NOT USE gemini-1.5-flash.
**
References
Web SDK code examples and usage patterns
iOS SDK code examples and usage patterns
Flutter SDK code examples and usage patterns
Android (Kotlin) SDK usage patterns
