Developer & Engineering Utilities
Fast, secure, client-side engineering tools. Format JSON, debug JWT tokens, encode Base64, generate UUIDs, test regular expressions, and compare code differences in real time.
JSON Formatter & Minifier
Beautify, validate, fix, and minify JSON payloads with syntax coloring and tree inspector.
JSON Schema & Syntax Validator
Detect syntax errors, line numbers, character positions, and validate JSON structures.
Base64 Encoder & Decoder
Encode and decode text, URLs, and image assets to and from RFC 4648 Base64 strings.
JWT Decoder & Token Inspector
Decode and inspect JSON Web Tokens client-side without sending tokens to any remote server.
UUID / GUID Generator (v4)
Generate cryptographically secure v4 UUIDs in bulk with uppercase, hyphen, and brace options.
Regex Tester & Matcher
Test JavaScript regular expressions with real-time capture groups, match highlighting, and flags.
URL Encoder & Decoder
Encode special characters to percent-encoded URI strings and parse URL query parameters.
Unix Timestamp & Epoch Converter
Convert Unix epoch timestamps (seconds/milliseconds) to human-readable UTC and local time.
Text & Code Diff Checker
Compare two text files or code blocks with side-by-side highlighting of additions and removals.
Strong Password & API Key Maker
Generate entropy-tested secure random passwords, passphrases, and 256-bit API secret keys.
Cryptographic Hash Generator
Compute SHA-256, SHA-512, SHA-384, SHA-1, and MD5 hashes using the Web Crypto API.