Developer Tools
14 tools- JSON Formatter / Validator
JSON Formatter / Validator — Format, minify, or validate any JSON in your browser. Choose indent style and see error details for invalid input.
- JWT Decoder
JWT Decoder — Paste a JWT and see the header, payload, expiry, and signature parts decoded. Everything happens in your browser.
- CSV ↔ JSON
CSV ↔ JSON — Convert tabular data between CSV and JSON. Header row detection, custom delimiter, quoted-field-with-comma support.
- JSON Diff
JSON Diff — Compare two JSON values structurally — see exactly what was added, removed, or changed, with full key paths.
- YAML Formatter
YAML Formatter — Paste any YAML and format it cleanly — pick indent width and line wrap, optionally sort keys. Also validates YAML syntax and converts b...
- JSON to TypeScript
JSON to TypeScript — Paste a JSON payload and instantly get TypeScript interfaces (or type aliases) describing its shape. Optionally mark all properties...
- JSON to Go Struct
JSON to Go Struct — Paste a JSON sample and get matching Go struct definitions — with optional
json:"..."tags,omitempty, and... - JSON to JSON Schema
JSON to JSON Schema — Paste any JSON sample and get a JSON Schema describing its shape — useful for API documentation, request/response validation, and ...
- JSON to Zod Schema
JSON to Zod Schema — Paste JSON and get a ready-to-use
z.object({...})Zod schema plus the inferred TypeScript type. - JavaScript Minifier
JavaScript Minifier — Paste your JavaScript code to minify it instantly. Removes comments, collapses whitespace, strips console.log and debugger stateme...
- HTML CSS JS Minifier
Free online code minifier. Compress HTML, CSS, and JavaScript code instantly in one place. Removes comments, whitespace, and formatting to optimize speed.
- HTML/CSS/JS Sandbox
Write HTML, CSS, JS in tabbed editors with live iframe preview. Auto-run, download as HTML file. Preloaded counter app sample. No server — pure browser.
- Keycode Info
Press any key to see its JavaScript keyboard event properties: key, code, keyCode, which, charCode. Essential for web developers.
- Benchmark Builder
Compare JavaScript code snippet performance side-by-side. Run benchmarks with configurable iterations and see ops/sec. Free browser-based tool.