Developer Utilities — Free Online Utilities
JSON format & validator, Base64 encoder/decoder, JWT inspector, UUID v4 generator & timestamps.
JSON Formatter & Beautifier
Format, validate, beautify, and minify JSON payloads with detailed syntax error pointers.
JSON Validator
Strict RFC 8259 JSON validation with line and column syntax error highlighting.
JSON Minifier
Compress JSON by stripping all indentation, newlines, and unnecessary whitespace.
Base64 Encoder / Decoder
Encode and decode plain text or files to and from Base64 string representations.
JWT Token Inspector
Decode JSON Web Tokens to inspect Header, Payload, and expiration status safely offline.
UUID / GUID Generator
Generate cryptographically secure RFC4122 Version 4 UUIDs in bulk.
Unix Timestamp Converter
Convert between Unix epoch timestamps (seconds & milliseconds) and human readable dates.
Cryptographic Hash Generator
Compute SHA-256, SHA-384, SHA-512, and SHA-1 hashes using browser Web Crypto.
Regex Tester & Matcher
Test JavaScript regular expressions with live match highlighting and group inspection.
Color Converter & Contrast
Convert between HEX, RGB, HSL and evaluate WCAG contrast ratios.