Puter.js

Puter.js is a JavaScript SDK built on top of Puter, the open-source "Internet Computer" licensed under AGPL-3.0. It lets developers ship full-stack web apps without provisioning servers, managing API keys, or configuring infrastructure — everything from user authentication to 500+ AI models is available from a single <script> tag. The project's GitHub repository has accumulated over 42,000 stars and the developer portal reports powering more than 130,000 apps.

What It Is

Puter.js is a frontend-first backend SDK designed to make building production-ready web apps as simple as writing a prompt. It wraps a comprehensive set of cloud services — auth, NoSQL database, object storage, serverless workers, real-time peer communication, TCP/IP networking, and an AI gateway — behind a small, consistent JavaScript API. Because the SDK is keyless and serverless by design, there are no credentials to obtain, rotate, or protect, and no backend code to deploy.

The "User-Pays" Model

The most distinctive aspect of Puter.js is its infrastructure cost model. According to the developer portal, developers pay $0 for infrastructure regardless of user count. Instead:

• Every Puter account includes its own allowance of storage, database, and AI usage.
• When an app calls puter.ai.chat() or writes to the database, usage is metered against the signed-in user's own Puter account.
• Users who exceed their allowance pay Puter directly; the charge never flows through the developer.
• App-level shared resources (e.g., a serverless worker) can run on the developer's own account.

This model eliminates the traditional scaling problem where infrastructure costs grow linearly with user count.

AI Gateway and Security Architecture

The AI Gateway is one of Puter.js's headline features, providing access to 500+ models from OpenAI, Claude, Gemini, Grok, and others through a single unified call. Because there are no API keys embedded in the frontend or backend, the attack surface for credential theft is eliminated. The Puter security layer sits between the app and AI providers, handling authentication, per-user scoping, rate limiting, abuse filtering, and DDoS protection automatically.

Platform Capabilities

Puter.js exposes a broad set of services through its SDK:

• AI Gateway — 500+ models, unified API
• Auth — user authentication and account management
• Storage — scalable cloud file system
• Database — serverless NoSQL key-value store
• Serverless Workers — run backend logic on demand
• Peer — real-time communication
• Networking — TCP/IP in the browser
• Hosting — instant static site hosting
• Image/Video Generation, Text-to-Speech, Speech-to-Text, OCR — media AI APIs

Designed for AI Coding Agents

The developer portal positions Puter.js explicitly as the backend for AI-generated apps. Because there is nothing to configure — no API keys, no server provisioning, no SDK setup — AI coding agents can produce a working full-stack app in a single shot. Puter publishes an llms.txt file at docs.puter.com/llms.txt so AI tools can read the full API in one request. The site claims compatibility with Claude Code, Codex, Cursor, GitHub Copilot, Google AI Studio, v0, Bolt, Lovable, and others, with no special integration required.

Update: Version 26.07.1

The latest release of the underlying Puter platform is version 26.07.1, published on July 15, 2026, with active development continuing on the main branch (last push July 17, 2026). The repository is written primarily in TypeScript and has accumulated over 3,900 forks, signaling an active open-source contributor base. The AGPL-3.0 license governs the core platform; Puter.js itself is distributed via npm as @heyputer/puter.js.