Juno

What is Juno?

Juno is an open-source SDK and full-stack platform for apps in WASM containers. The site says Juno is in maintenance and not actively developed anymore.

What Juno does

The stack includes hosting for static sites, SPA, and SSG, authentication with Google, GitHub, Passkeys, and Internet Identity, a key-value datastore, file storage, serverless functions in Rust or TypeScript, and privacy-friendly analytics. A frontend can use React, SvelteKit, or Next.js. The app is bundled into one WebAssembly container. A CLI or the Console UI can manage projects. Deploys can use GitHub Actions. The emulator is for work locally.

Who Juno is for

Juno is for web developers building and hosting apps. The page says not to use it for anything serious, unless the need is only a static website.

How Juno works

Scaffold with npm create juno@latest, or add skills with npx skills add junobuild/skills. Build the frontend, add a Rust or TypeScript function if needed, and test in the emulator. Deploy with a Satellite when the app should go live. The container holds data, logic, and storage. Juno has zero access to the code, data, or infrastructure. There is no cold start.

Key features

• Open-source SDK for apps in WASM containers, with no DevOps.
• Hosting, authentication, key-value datastore, storage, functions, and analytics.
• Google, GitHub, Passkeys, and Internet Identity.
• Serverless functions in Rust or TypeScript.
• React, SvelteKit, or Next.js on the frontend.
• Emulator for work locally, then a Satellite deploy.
• CLI or Console UI, with GitHub Actions for deploys.
• The site says maintenance, and not actively developed anymore.

Facts from juno.build, checked 14 October 2026

• The page says zero DevOps and no cold start.
• npx skills add junobuild/skills is for AI agent skills.
• Monitoring and Snapshots are listed with the other products.
• The page says the emulator mirrors production.

Written from Juno's own website (Homepage, Docs). The maker can claim this listing to edit it.