Free Developer Tools
Format JSON, decode JWTs, convert timestamps, test regex, and more. No installation required — all tools run in your browser.
JSON
JSON Formatter & TypeScript Generator
Format and validate JSON. Generate TypeScript interfaces from JSON. Copy or download output.
JSON to CSV Converter
Convert JSON array to CSV. Flatten objects and download or copy CSV.
JSON to Code Generator
Convert JSON to TypeScript, Python, Java, Go, Rust, or C#. Select output language and generate types or classes.
Data & Format
Format Converter
Convert between CSV, JSON, XML, and YAML. Select source and target formats.
SQL Formatter
Format and beautify SQL queries. Indent and uppercase keywords.
Diff Checker
Compare two texts or code blocks. Side-by-side and unified views.
Markdown Previewer
Preview Markdown as HTML. Export rendered output.
HTML to Markdown Converter
Convert HTML to Markdown. Paste HTML and get clean Markdown output.
Color Converter
Convert between HEX, RGB, and HSL color formats.
Encoding
Security & Auth
Bcrypt Generator
Hash passwords with bcrypt. Compare hashes to verify.
Password Generator
Generate secure random passwords. Customize length and character types.
SHA256 Generator
Generate SHA256 hashes from text. Fast, client-side hashing.
JWT Decoder
Decode and inspect JWT tokens. View header, payload, and expiration.
JWT Generator
Generate JWT tokens with custom header and payload. Sign with HMAC-SHA256. Pair with JWT Decoder.