Identity & APIs

UUID v4 Generator and JWT Decoder

Generate UUID v4 identifiers for fixtures, tests, and temporary entities, or paste a JWT to view its header and payload. This is a local inspection tool, not a replacement for server-side signature verification.

100% Local In-Browser Processing

Zero uploads to external servers. This tool retains a temporary draft in this device's local storage (localStorage) for convenience and continuity. You can delete saved data via the button on the right.

v2.2.0
Size: 0 B
Keys: 0
Depth: 0
Input JSON
Formatted JSON or TypeScript

100% Local In-Browser Processing

Zero uploads to external servers. This tool retains a temporary draft in this device's local storage (localStorage) for convenience and continuity. You can delete saved data via the button on the right.

v2.2.0

Privacy by default

Tokens and identifiers processed locally

JWT payloads are decoded only in the active browser session. There is no upload, remote storage, or third-party validation request.

Explore the full developer toolkit

Go to Developer Studio

UUID and JWT FAQ

Does the decoder validate a JWT signature?

No. It only decodes the header and payload for inspection. Cryptographic validation must happen in the service that owns the token.

Can I use generated UUIDs in production?

They are suitable for many application flows and tests, but production identifier choices should follow your data model and system requirements.