100% In-Browser & Private — your data never leaves this device

JavaScript & TypeScript Tools Online

Whether you need a JavaScript compiler to test a quick snippet, a TypeScript playground to try generics, or utilities to format JSON and escape strings, PeachTools runs everything locally. Pick a tool below — each page works instantly without sending your source code to a server.

Run, test, format, and convert JavaScript and TypeScript privately in your browser. No uploads, no accounts — your code stays on your device.

6 tools · 100% in-browser · All developer tools

JavaScript Playground

Run and test JavaScript online in a private, in-browser sandbox. Use it as a JS compiler or snippet tester — execute code with console output in an isolated Web Worker. Your code never uploads to PeachTools.

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TypeScript Playground

Run TypeScript online — use it as a TS compiler and tester. Transpile interfaces, generics, and async code locally, then execute in your browser with instant console output. Nothing uploads to a server.

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Regex Tester

Test regular expressions with live matches, capture groups, and replace — 100% in your browser.

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JSON Formatter