Node 22

Run JavaScript Online

Execute JavaScript code instantly with Node.js 22 in a secure, isolated sandbox. No setup, no installs — just write and run.

Open in Playground Get API Access

index.js

// Node.js 22
const greeting = 'Hello from JavaScript!';
console.log(greeting);
console.log(`Factorial of 10 = ${[...Array(10)].reduce((a, _, i) => a * (i + 1), 1)}`);

Output

Click "Run Code" to execute...

About JavaScript

JavaScript is the language of the web, powering both front-end and back-end development. With Node.js, it brings async/await, the npm ecosystem, and full-stack capabilities to server-side programming.

Our sandbox runs Node.js 22 with full standard library and module support.

Sandbox Features

Secure execution with Docker + gVisor isolation
Node.js 22 with ES modules support
Up to 300s execution time (Pro tier)
Stdin support for interactive programs
REST API for programmatic access
No setup or installation required

Use JavaScript with stateful sessions

Open a session once, then call execute repeatedly — variables, files, and installed packages persist between runs. Perfect for code interpreters and REPL-style agents.

# 1. Create a session
curl -X POST https://api.sandboxapi.dev/v1/sessions \
  -H "X-RapidAPI-Key: $KEY" \
  -d '{"language":"javascript","idle_ttl":300}'
# → {"id":"sess_abc","language":"javascript",...}

# 2. Execute — first call
curl -X POST https://api.sandboxapi.dev/v1/sessions/sess_abc/execute \
  -H "X-RapidAPI-Key: $KEY" \
  -d '{"code":"let x = 42"}'

# 3. Execute again — state carries over
curl -X POST https://api.sandboxapi.dev/v1/sessions/sess_abc/execute \
  -H "X-RapidAPI-Key: $KEY" \
  -d '{"code":"console.log(x * 2)"}'

Read the sessions docs →