Local JWT Tool

A local JWT inspector for macOS.

Wring gives macOS developers a fast way to decode and inspect JSON Web Tokens from the menu bar. Paste a JWT, review its header, payload, claims, expiry state, and signature section, then copy the useful parts back to your editor.

What it does

  • Decode JWT header and payload locally on your Mac.
  • Inspect standard claims such as exp, iat, nbf, iss, sub, and aud.
  • Verify HS256/HMAC signatures with a secret you provide.
  • Avoid sending OAuth tokens, API tokens, or session data to random web tools.

Why local matters

Wring v1 does not fetch JWKS endpoints automatically. The app has no network entitlement, so JWT inspection stays local unless a future opt-in workflow explicitly adds network access.

When to use it

  • Debug OAuth and API tokens during development.
  • Check whether a token is expired before pasting it into logs or docs.
  • Inspect payload shape while keeping private claims on your Mac.