OAuth 2.0 Token Tester
Decode and inspect OAuth 2.0 access tokens.
Token Overview
Header
Payload
Signature
Custom Claims
What is an OAuth 2.0 Token?
OAuth 2.0 access tokens are credentials used to access protected resources on behalf of a user. They are typically formatted as JSON Web Tokens (JWT) containing claims about the user, permissions, and token metadata such as issuer, audience, and expiration time.
This tool decodes the token locally to reveal its contents — no data is sent to any server. You can inspect standard claims (iss, sub, aud, exp, iat) as well as custom claims specific to your application.
How to Use
- Paste your token — Copy an OAuth 2.0 access token (JWT format) and paste it into the input area.
- Decode — Click Decode Token or press Ctrl+Enter to decode the token and view its contents.
- Review claims — Check the header (algorithm, type), payload (issuer, subject, audience, expiry, custom claims), and signature.
- Check validity — The status badge shows whether the token is still valid, expiring soon, or expired based on the exp claim.
Frequently Asked Questions
Is my token sent to a server?
No. All decoding happens locally in your browser. Your token never leaves your device.
Does this tool verify the token signature?
No. This tool decodes the token to show its contents, but does not verify the cryptographic signature. Use the JWT Token Verifier tool to verify signature validity.
What is the difference between OAuth 2.0 and JWT?
OAuth 2.0 is an authorization framework that defines how tokens are issued and used. JWT is a token format that can be used as an OAuth 2.0 access token. Not all OAuth tokens are JWTs, but most modern implementations use JWT format for access tokens.
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