Developer tools
Formatters, encoders and inspectors for everyday programming work.
- JSON Formatter & Validator Format, validate, minify or key sort JSON with clear error messages. Runs in your browser, so API responses and configs never leave your device.
- Base64 Encoder & Decoder Encode text to Base64 or Base64URL and decode it back, with full UTF-8 support for accents, Urdu script and emoji.
- URL Encoder & Decoder Percent encode or decode URL components and full URLs. Handles Unicode and reports malformed escape sequences instead of failing silently.
- JWT Decoder Decode a JSON Web Token header and payload, convert iat, nbf and exp to readable dates, and see whether it has expired. Tokens stay on your device.
- SHA Hash Generator Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text using the browser Web Crypto API. Nothing you type is uploaded.
- UUID v4 Generator Generate up to 1,000 random version 4 UUIDs at once using a cryptographically secure random source, in lowercase, uppercase or without hyphens.
- Regex Tester Test JavaScript regular expressions against sample text and list every match with its position and capture groups.
- Unix Timestamp Converter Convert Unix timestamps in seconds or milliseconds to ISO 8601, UTC and local time, or turn a date string back into a timestamp.
- JSON to CSV Converter Convert a JSON array of objects into a CSV file. Nested objects become dot notation columns and formula like cells are neutralised for spreadsheets.
- CSV to JSON Converter Parse CSV (quoted fields, embedded commas and line breaks included) into a JSON array, using the header row as keys and optional type inference.
- HTML Entity Encoder & Decoder Escape text for safe use inside HTML, encode every non-ASCII character as a numeric entity, or decode named and numeric entities back to text.
- Diff Checker Compare two texts line by line and see exactly which lines were added or removed, with an option to ignore whitespace changes.
- Cron Expression Explainer Translate a five field cron expression into plain English and list its next scheduled run times in your local time zone.
- Number Base Converter Convert integers of any size between binary, octal, decimal, hexadecimal and base 36 using exact BigInt arithmetic.
- JSON to TypeScript Interfaces Generate TypeScript interfaces from a sample JSON payload, with nested types, optional properties inferred from arrays, and safe property names.
- IPv4 Subnet Calculator (CIDR) Calculate network address, broadcast, usable host range, subnet mask, wildcard mask and host count from any IPv4 address and CIDR prefix.
- Chmod Calculator (Linux Permissions) Convert Linux file permissions between octal (755) and symbolic (rwxr-xr-x) notation and see exactly who can read, write and execute.
- YAML ⇄ JSON Converter Convert YAML to JSON and JSON to YAML for Kubernetes manifests, GitHub Actions, Docker Compose and config files, with clear parse errors.
- SQL Formatter Beautify messy SQL queries with consistent indentation and keyword case for MySQL, PostgreSQL, SQL Server, SQLite and more.
- CSS & JavaScript Minifier Minify JavaScript with Terser and CSS with a safe whitespace and comment remover, and see how many bytes and percent you save.
- CSS Gradient Generator Build linear and radial CSS gradients from up to five colours, preview them, and copy ready to use CSS for backgrounds and buttons.
- HTTP Status Code Lookup Look up what any HTTP status code means, from 200 OK and 301 redirects to 404, 429 and 503, with practical notes for debugging.
- User Agent Parser Parse a browser user agent string into browser, version, operating system, rendering engine and device type. Shows your own by default.
- XML Formatter & Validator Pretty print and validate XML for sitemaps, RSS feeds, SOAP and config files, with clear well formedness errors. Parsed safely, never executed.
- Password Strength Checker Check how strong a password is with an entropy estimate, common password and pattern detection, and an estimated offline cracking time.