Developer & Data Formatter Utilities
Essential in-browser formatters, decoders, regex testers, and query beautifiers with zero server roundtrips.
JWT Token Decoder
Decode JSON Web Token header, payload, and verify expiration dates
JWT Token Input
Client-side zero-leak decoder with expiration checks. Sensitive keys never touch our servers.
Mathematical Formula & Engineering Rules
Splits the dot-separated string into Header, Payload, and Signature components, decoding each base64url segment.
Worked Engineering Example
Decode OAuth tokens to verify role claims and whether exp timestamp is still valid.
Frequently Asked Questions
Q1:
Explore Sibling Calculators
JSON Formatter
Beautify, minify, validate, and inspect JSON structures locally
Base64 Converter
Text and binary string encoding/decoding with UTF-8 safety
Regex Tester
Real-time JavaScript regex matching with capture group inspection
SQL Formatter
Clean indentation and keyword capitalization for SQL dialects
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