Free online developer tools
Format code, decode tokens, read cron expressions, compare files and generate identifiers. Small tools for the jobs that interrupt an afternoon.
- Code Formatter — Prettier in Your BrowserFormat JavaScript, TypeScript, CSS, SCSS, HTML, JSON, YAML, Markdown and GraphQL with Prettier. Runs locally — your code is never uploaded.
- Text Comparison ToolFree online tool to compare two blocks of text or JSON side by side, in your browser. No sign-up, no ads, and completely private.
- JWT Decoder — Read Tokens PrivatelyDecode a JSON Web Token's header, payload and expiry, and verify an HS256 signature, entirely in your browser. No dependencies and no network requests.
- Cron Explainer — Read Any Cron ExpressionPaste a cron expression and get plain English, a field-by-field breakdown, and the next five run times. Free, instant and entirely in your browser.
- UUID & ID GeneratorGenerate UUIDs and short random IDs in bulk, using the browser’s cryptographic random source rather than Math.random. Free, instant and private.