Free Developer Tools — JSON, Regex, SQL, JWT & More
Developer tools should solve frequent, concrete tasks quickly. Start with the highest-value utilities, then follow related links into adjacent workflows.
Browse Developer utilities
Regex Tester
Test JavaScript regular expressions against sample text with configurable flags, matches and capture-group output in your browser.
Open tool →Developer utilitySQL Formatter
Format common SQL queries with clause-aware indentation and a selectable SQL dialect label for Standard SQL, PostgreSQL, MySQL or SQLite.
Open tool →Developer utilityHash Generator
Generate cryptographic hashes locally in your browser using the Web Crypto API.
Open tool →Developer utilityJSON Formatter
Format and pretty-print JSON in your browser with configurable indentation and clear validation feedback.
Open tool →Developer utilityJSON Validator
Validate JSON syntax in your browser with parser error details including line and column when available.
Open tool →Developer utilityJSON Minifier
Remove unnecessary JSON whitespace while preserving valid JSON structure.
Open tool →Developer utilityJSON Diff / Compare
Compare two JSON documents and report added, removed and changed values by JSON path in your browser.
Open tool →Developer utilityJSON to CSV Converter
Convert an array of JSON objects into CSV in your browser.
Open tool →Developer utilityCSV to JSON Converter
Convert comma-separated tabular data into a JSON array in your browser.
Open tool →Developer utilityURL Encoder & Decoder
Encode or decode URL components safely in your browser.
Open tool →Developer utilityBase64 Encoder & Decoder
Encode text to Base64 or decode Base64 text directly in your browser.
Open tool →Developer utilityHTML Formatter
Format HTML with readable indentation in your browser.
Open tool →Developer utilityXML Formatter
Format XML with readable indentation in your browser.
Open tool →Developer utilityUUID Generator
Generate RFC 4122-style random UUIDs locally in your browser.
Open tool →Developer utilityUnix Timestamp Converter
Convert Unix timestamps to readable UTC dates and dates to Unix seconds.
Open tool →Developer utilityJWT Decoder
Decode the header and payload of a JWT locally without verifying its signature.
Open tool →How this collection is organized
A focused developer cluster is easier to navigate and internally link than a flat catalogue. The collection emphasizes practical browser tools for JSON, regex, SQL, JWT, URLs, hashing, UUIDs and timestamps.