javascript

JSON Formatter / Validator — Format, minify, or validate any JSON in your browser. Choose indent style and see error details for invalid input.

JWT Decoder — Paste a JWT and see the header, payload, expiry, and signature parts decoded. Everything happens in your browser.

CSV ↔ JSON — Convert tabular data between CSV and JSON. Header row detection, custom delimiter, quoted-field-with-comma support.

JSON Diff — Compare two JSON values structurally — see exactly what was added, removed, or changed, with full key paths.

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 — Paste a JSON payload and instantly get TypeScript interfaces (or type aliases) describing its shape. Optionally mark all properties...

JSON to Go Struct — Paste a JSON sample and get matching Go struct definitions — with optional <code>json:"..."</code> tags, <code>omitempty</code>, and...

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 — Paste JSON and get a ready-to-use <code>z.object({...})</code> Zod schema plus the inferred TypeScript type.

JavaScript Minifier — Paste your JavaScript code to minify it instantly. Removes comments, collapses whitespace, strips console.log and debugger stateme...

Free online code minifier. Compress HTML, CSS, and JavaScript code instantly in one place. Removes comments, whitespace, and formatting to optimize speed.

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.

Press any key to see its JavaScript keyboard event properties: key, code, keyCode, which, charCode. Essential for web developers.

Compare JavaScript code snippet performance side-by-side. Run benchmarks with configurable iterations and see ops/sec. Free browser-based tool.

XLSX to JSON — Convert any Excel sheet to JSON — array of objects keyed by header row, or array of arrays with no header.

JSON to CSV — Convert any JSON array (of objects or arrays) — or even a single object — into clean CSV. Tick the Flatten option to expand nested objects...