OAuth 2.0 Debugger
Debug and inspect OAuth 2.0 flows, tokens, and parameters.
Decode Access Token
Paste your OAuth 2.0 access token to decode it.
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Using OAuth Token Debugger for open banking
Inspect JWT-formatted OAuth tokens and test a token endpoint request.
Sandbox example and expected result
Use a sandbox JWT to inspect its claims; opaque access tokens cannot be decoded as JWTs.
Limitations and troubleshooting
Decoding is not signature verification. Token endpoint calls may be blocked by browser CORS policy; only use credentials intended for browser-based sandbox testing.
Where your input is processed
Decoding runs locally. Token requests send the entered credentials directly from your browser to the endpoint you specify. Use synthetic test data.
Maintained by OpenFinanceTools. Guidance updated 23 October 2026. Testing and editorial approach