Dev Tools

JWT Decoder

Decode JWT tokens and inspect header, payload and expiry. Client-side only.

Built these tools for my own daily development use over the years — sharing them freely with the community. All processing is 100% client-side; nothing is sent to any server.

JSON Base64 JWT UUID URL Encode Password Regex Diff

JSON Formatter & Validator

Input

Output

Base64 Encoder / Decoder

Input

Output

JWT Decoder

Token

Client-side decode only. Signature NOT verified. Never paste tokens with real user data.

UUID v4 Generator

Count:

URL Encoder / Decoder

Input

Output

Password Generator

Length: 16

A–Z a–z 0–9 !@#$

Count:

Regex Tester

Pattern

Flags

Test string

Text Diff

Original

Modified