Guides and tutorials for developers — JSON, JWTs, cryptography, and more.
Analyze log files online for free. Learn how to read Apache and Nginx access logs, filter by status code and log level, debug 5xx errors, and parse JSON logs — all in your browser.
Learn how to generate realistic mock data for APIs, tables, demos, CSV exports, SQL seeds, and frontend testing without exposing production records.
A practical guide to reading HTTP response headers, spotting missing security headers, debugging CORS, and checking cache behavior.
Format JavaScript, TypeScript, JSON, HTML, CSS, and SQL snippets online. Learn when to beautify, minify, and validate code before sharing or debugging.
Understand Base64, URL encoding, hex, binary, and gzip. Learn when to encode, decode, avoid double-encoding, and inspect data safely in your browser.
Learn how to format, validate, and debug JSON instantly using a free online tool. Covers common JSON errors, best practices, and how to read JSON like a pro.
A practical guide to decoding JSON Web Tokens — understand the header, payload, and signature, read standard claims, and spot security issues in seconds.
Generate SHA-256, SHA-512, and other cryptographic hashes directly in your browser. Learn what hashing is, why SHA-256 is the industry standard, and how to verify file integrity.