Puter.js
Serverless JS SDK giving frontend apps auth, storage, hosting, and 500+ AI models with no API keys.
About
Puter.js is the JavaScript SDK for Puter, the open-source cloud desktop OS (core platform AGPL-3.0), and its killer feature is the user-pays model: developers add one script tag or npm install @heyputer/puter.js and get auth, cloud file storage, a NoSQL key-value database, hosting, and an AI Gateway spanning 500+ models (GPT, Claude, Gemini, image/video/TTS/STT/OCR) — with usage metered to each signed-in user's own Puter account, so the developer pays $0 and manages zero API keys or servers.
Puter explicitly positions Puter.js as the backend for AI-generated apps: an llms.txt at docs.puter.com lets coding agents ingest the whole API in one request, and the team claims compatibility with Claude Code, Codex, Cursor, Copilot, v0, Bolt, and Lovable, since keyless serverless apps generated by AI work end-to-end with no backend provisioning. Honest caveats: the user-pays model means your users need Puter accounts with their own usage allowances; the platform is young with evolving rate limits; and AGPL-3.0 on the core platform matters if you self-host rather than using Puter's cloud.
What it can do
- AI Gateway: 500+ models via unified puter.ai.chat() API
- User auth, cloud filesystem, and NoSQL key-value store
- Static site hosting and serverless workers
- Image/video generation, TTS, STT, and OCR APIs
- llms.txt for AI coding-agent consumption
Setup
Add <script src="https://js.puter.com/v2/"></script> or npm install @heyputer/puter.js.
Prerequisites
A Puter account for end users (free tier available); no backend or API keys needed.
Use cases
Works with
Trust score — 8/10
Scored 8/10 (verified tier, metrics-v1). Evidence: Verified via vendor site/docs/GitHub and reputable coverage, wave 70; Trending score 76/100 from researcher assessment.
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.