Developer Tools
Format, validate, test, and encode code and data payloads seamlessly. Free, fast, private, and accessible right from your browser.
Available Developer Tools
JSON Formatter
Prettify, format, minify, and inspect JSON payloads locally in browser memory.
JSON Validator
Validate JSON syntax and pinpoint structural errors with line and column numbers.
Base64 Encoder & Decoder
Encode UTF-8 text to Base64 and decode Base64 strings safely in browser.
JWT Decoder
Decode and inspect JSON Web Token (JWT) headers, payloads, and claims locally.
Regex Tester
Test and debug JavaScript Regular Expressions with real-time match highlighting and ReDoS safety.
SQL Formatter
Beautify and format complex SQL queries for PostgreSQL, MySQL, SQLite, and T-SQL.
URL Encoder & Decoder
Encode special characters into percent-encoded URLs or decode URLs to plain text.
Unix Timestamp Converter
Convert Epoch timestamps (seconds/milliseconds) to human dates and vice versa.
About Developer Tools on Toolzone
All utilities in the Developer Tools suite are engineered for maximum speed, strict privacy, and device portability. Compatible operations run entirely within your local browser memory using modern WebAssembly and JavaScript, while heavy document conversions are isolated in temporary sandboxes with automated deletion guarantees.