Can I use this for sensitive production tokens?

Local decoding avoids upload, but pasted tokens can still be visible on your screen and copied into browser memory. Prefer redacted or short-lived tokens when debugging.

JWT Decoder

Decode JSON Web Token headers and payloads locally in your browser, then inspect expiration and validity timing claims.

JWT input

0 characters

Paste a JWT and decode it locally. Signature verification is not performed.

Header

Payload

Claim timing

exp, nbf and iat details appear here when present.

Decode only

This page does not verify signatures or validate trust. Treat decoded claims as untrusted until a backend or approved key-handling flow verifies the token.

Token parts

Header segment
Payload segment
Signature segment

Local developer debugging

Inspect API tokens, session fixtures and OAuth samples without using an upload endpoint.

Readable claims

Pretty printed JSON makes issuer, subject, audience, scopes and custom claims easier to review.

Timing checks

Quickly see whether exp, nbf and iat are in the past, current or future using your device clock.

Frequently Asked Questions

Is my JWT uploaded when I decode it?

No. The token is decoded with JavaScript in your browser. It is not sent to Convertr servers.

Does this tool verify JWT signatures?

No. This MVP decodes the header and payload only. Signature verification is intentionally not included until key handling and trust UX are approved.

What timing claims does the decoder show?

The tool highlights exp, nbf and iat when those claims are present, with UTC time, local time and relative status.