JavaScript Tools
Minify and beautify code, test regular expressions with live highlighting and a plain-English explanation, and decode JSON Web Tokens without sending them anywhere.
JavaScript Minifier
Minify and compress JavaScript with Terser: mangle names, drop dead code, optionally remove console calls.
JavaScript Beautifier
Reformat minified or messy JavaScript with consistent indentation and brace style.
Regex Tester & Explainer
Test JavaScript regular expressions with live highlights, groups and a plain-English explanation.
JWT Decoder
Decode a JSON Web Token locally: header, payload, expiry. Nothing is sent anywhere.
About these JavaScript tools
Every tool on this site runs 100% in your browser. The text, files and tokens you enter are processed on your own device and are never uploaded to a server, so it is safe to try them on real-world data. Each page explains what the tool does, walks through a worked example and answers common questions.
Minification and beautification use the open-source Terser and js-beautify libraries, loaded only on the page that needs them. The regular expression tester uses your browser's own JavaScript engine, so what matches here is exactly what will match in your code.