Developer Tools
Essential utilities for developers including formatters, validators, encoders, and decoders.
Free Online JSON Formatter and Validator
Format, validate, and beautify JSON instantly in your browser with local processing by default.
Free Online JSON Validator
Validate JSON syntax instantly with detailed error diagnostics and local browser processing.
Free Base64 Encoder and Decoder
Encode and decode text to and from Base64 instantly in your browser.
URL Encoder and Decoder
Encode and decode URLs and query parameters instantly.
Free UUID v4 Generator
Generate random UUIDs (v4) instantly with bulk copy support.
JWT Decoder
Decode a JWT header and payload, inspect its claims, and see expiry warnings. Decoding is not verification, and this tool says so plainly.
Number Base Converter
Convert integers between binary, octal, decimal, hexadecimal and any base from 2 to 36, exactly, with two’s-complement views.
JSON Minifier
Minify JSON by removing insignificant whitespace, with exact size savings reported and string contents preserved byte for byte.
XML Formatter and Validator
Format and validate XML with real indentation, precise error locations, and CDATA and comments preserved exactly.
CSV Formatter and Viewer
Parse and reformat CSV correctly, including quoted fields, escaped quotes, embedded commas and newlines inside values.
Regex Tester
Test JavaScript regular expressions against sample text with live matches, capture groups, named groups and clear syntax errors.
URL Parser
Split any URL into scheme, host, port, path, query parameters and fragment, with security warnings and credentials never displayed.