Developer tools
Formatters, decoders and generators for the data formats developers touch daily — JSON, Base64, JWT, UUID. Each one runs entirely in your browser, so payloads and tokens never leave your machine.
JSON Formatter
Pretty-print and validate JSON, with the error line reported.
Open →Base64 Encode / Decode
Convert text to Base64 and back, with proper UTF-8 support.
Open →JWT Decoder
Read a JWT's header and payload. The signature is not verified.
Open →UUID v4 Generator
Generate random UUID v4 identifiers, one at a time or in bulk.
Open →