A fast, secure, free collection of browser-based developer utilities for formatting JSON, decoding JWT tokens, encoding/decoding URLs, and comparing text differences. All tools run completely offline and process your data locally in your browser for absolute privacy.
Paste, format, and validate JSON data instantly. The online JSON validator helps you parse and troubleshoot syntax errors, showing exact line error messages. Inspect complex JSON files using the tree view explorer or tabular data table. Export parsed objects to CSV format or clean minified JSON strings. Secure client-side execution ensures your JSON files never leave your computer.
Decode JSON Web Tokens (JWT) safely. The online JWT tool extracts claims, token headers, payloads, and signatures from JWTs. Easily verify encryption algorithms, type flags, token issues (iss), expiration times (exp), subjects (sub), and audiences (aud). Decoding is performed entirely client-side using JavaScript, keeping your sensitive JWT tokens safe from external networks.
Percent-encode or decode URLs, URI fragments, and query string parameters. Automatically parses full URLs to isolate components: protocol, host, port, path, anchor hash, and key-value query parameters in an interactive grid. Useful for troubleshooting API URLs and query param formats.
Compare two versions of code, configurations, logs, or plain text side-by-side or in a unified inline layout. Highlights character and word-level modifications in added, removed, or changed lines. Features include automatic height synchronization between input panels, resizable text editors, and floating Next/Prev navigation for quick diff reviews.