NeilFraser/JS-Interpreter

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

2185 stars · 364 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A sandboxed JavaScript interpreter written in JavaScript that executes arbitrary ES5 code in isolation and safety. It supports line-by-line stepping, making it suitable for safely running untrusted user-supplied scripts.

Use cases

• safely execute untrusted user JavaScript in the browser
• run user-submitted scripts in a sandboxed environment
• step through JavaScript code line by line for debugging or education
• embed a scripting engine in a web application without eval
• build a code playground with restricted execution
• run plugins or extensions written by users safely

When to choose

• you need to run arbitrary, untrusted JavaScript safely in a browser or Node.js
• you need fine-grained control over execution, such as stepping line by line or limiting APIs
• you want to expose a restricted API surface to user scripts

When to avoid

• you need modern ES6+ JavaScript features, since the interpreter targets ES5
• you need maximum performance for trusted code, since interpretation is far slower than native execution
• you just need JSON parsing or templating rather than full script execution

Facets

library · maturity active

interpreter security parser programming-languages security developer-tools web-development browser javascript-interpreter sandbox es5 arbitrary-code-execution step-execution sandboxing nodejs javascript

Member repositories

For agents

markdown · JSON · MCP: product_card(name="NeilFraser/JS-Interpreter")