JavaScript Tools

Format, inspect and run JavaScript in a sandboxed worker isolated from this site.

JavaScript Beautifier Reformats minified or messy JavaScript into consistently indented code.
JavaScript Benchmark Runner Times a snippet over many iterations and says when the result is too small to believe.
JavaScript Expression Evaluator Evaluates one expression per line and shows the result of each beside it.
JavaScript Minifier Removes comments and whitespace without touching strings or regular expressions.
JavaScript Object to JSON Converts a JavaScript object literal into valid, formatted JSON.
JavaScript Sandbox Runs a snippet in a disposable worker and shows everything it logged and returned.
JavaScript Syntax Checker Says whether a snippet parses, and shows the engine error if it does not.
JSON to JavaScript Object Turns JSON into a readable JavaScript object literal you can paste into source.
Processing happens locally in your browser. What you paste or load is processed by this page and is not uploaded to a server. Nothing is stored unless you use a control that says it stores something, and you can clear anything this site has kept from the privacy page.