Ant, a lightweight JavaScript runtime: Ant: Lightweight
A 9 MB JavaScript runtime with npm support, TypeScript, and VM-isolated sandboxing.
★ 4.0 / 5 iKeep scoreScreenshots
Quick facts
Overview
Ant is a lightweight JavaScript runtime built from scratch with its own engine, Ant Silver. It supports npm packages, TypeScript without a build step, and includes a VM-isolated sandbox for secure execution of untrusted code. The entire runtime ships as a portable 9 MB binary.
Getting started with Ant, a lightweight JavaScript runtime
- Download the binaryDownload the 9 MB Ant binary from the official website (antjs.org) for your operating system.
- Run a scriptExecute a JavaScript or TypeScript file directly using the Ant runtime without needing a build step.
- Use npm packagesInstall and use npm packages directly with Ant, as it includes built-in npm support.
- Sandbox executionRun untrusted code securely using Ant's VM-isolated sandbox feature.
Pricing
| Plan | Price | Note |
|---|---|---|
| Open-source | Free | open-source project |
💡 Indicative pricing — check the official rates at antjs.org · Updated 7/16/2026
Original pricing screenshotKey features
- 9 MB binary with built-in npm & TypeScript support
- VM-isolated sandbox for secure code execution
- Cold starts 2-6x faster than Node/Bun/Deno
- Native WebAssembly (Wasm) support
- Compatible with popular frameworks like Hono, Elysia, React
- Open registry (ants.land) with npm protocol support
Pros
- Extremely lightweight with fast startup times
- Built-in security with hardware-isolated sandbox
- No build step required for TypeScript
Cons
- Newer runtime with smaller ecosystem than Node
- Limited documentation compared to established alternatives
Use cases
- Developing lightweight JavaScript/TypeScript applications
- Running untrusted code in secure sandboxes
- Quick prototyping without build toolchains
- Edge computing with small footprint requirements
The verdict
Ant delivers impressive performance in a tiny package, making it ideal for developers who prioritize startup speed and security. While the ecosystem is still growing, its sandbox features and TypeScript support make it stand out from traditional runtimes.
✓ Who should use it
JavaScript/TypeScript developers who need fast cold starts, secure execution environments, or minimal runtime overhead.
✕ Who should skip it
Teams deeply invested in Node.js's ecosystem or needing extensive third-party module support.
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Frequently asked questions
Is Ant, a lightweight JavaScript runtime free?
Ant, a lightweight JavaScript runtime is free to use.
What is Ant, a lightweight JavaScript runtime best for?
Developers needing a fast, secure JavaScript runtime with minimal overhead
Does Ant, a lightweight JavaScript runtime have an API?
Yes, Ant, a lightweight JavaScript runtime offers an API.
Can I self-host Ant, a lightweight JavaScript runtime?
Yes, Ant, a lightweight JavaScript runtime can be self-hosted.
Who should use Ant, a lightweight JavaScript runtime?
JavaScript/TypeScript developers who need fast cold starts, secure execution environments, or minimal runtime overhead.
Reviews 4.0 ★ · 1 review
Ant impresses with its minimal footprint and thoughtful features. The 9MB binary that runs npm packages and TypeScript out of the box is remarkable, as is the hardware-isolated sandbox - a security feature that sets it apart. Performance benchmarks show it starting significantly faster than alternatives, making it ideal for CLI tools and serverless functions. The built-in Wasm support and npm compatibility mean you're not sacrificing ecosystem access. While documentation could be more extensive, Ant delivers where it counts: a fast, secure runtime that gets out of your way. It's particularly compelling for edge computing scenarios and any use case where startup time matters.
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