exp) in the payload, helping developers investigate authentication, single sign-on and API token issues.inspect oauth id token jwt payload in browser
Inspect oauth id token jwt payload in browser. This tool handles this and related scenarios — including view jwt expiration exp claim unix timestamp and decode keycloak realm access token jwt offline — entirely in your browser with no signup or file upload.
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Decode firebase auth jwt claims without secret. Whether you work with API data, config files, or log output, everything is processed locally. Related tasks like decode keycloak realm access token jwt offline are also supported.
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Parse auth0 id_token jwt header algorithm. You can also use this tool for inspect okta openid connect jwt token locally and decode supabase auth jwt payload claims. All results appear instantly in the editor — no server round-trip required.
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Inspect aws cognito jwt token claims online. This is one of many scenarios this tool supports. You can also decode supabase auth jwt payload claims without leaving the page or creating an account.
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Decode azure ad jwt access token roles. All processing happens on your device, ensuring your data stays private. Related capabilities include view jwt expiration exp claim unix timestamp and decode keycloak realm access token jwt offline.
Overview
JWT Decoder is a debugging tool built to parse JSON Web Tokens. It splits the compact three-segment string into readable Header, Payload and Signature sections, and intelligently detects the expiration time (
How to Use This Tool
Step 1 — paste a complete JWT (in the form
xxxxx.yyyyy.zzzzz) into the input field, or click "Sample" to load a test token. Step 2 — the tool automatically Base64URL-decodes the Header and Payload and formats them as readable JSON. Step 3 — if the Payload contains an exp claim, the tool compares it with the current time and shows a prominent warning when the token has expired. Step 4 — the Signature is shown as raw Base64URL because verifying a signature requires the secret and must be done server-side. Step 5 — copy the decoded Header or Payload to help debugging.Common Use Cases
Debug OAuth 2.0 and OIDC flows by inspecting claims in
access_token or id_token; front-end developers pull tokens from Cookies or LocalStorage to check identity fields (sub, role, iat, exp); verify JWTs issued through microservice gateways such as Kong or APISIX; debug cross-system token propagation while onboarding an SSO integration.Technical Details
The tool only parses JWT structure; it does not verify HMAC, RSA or ECDSA signatures (which need the signing key or public key and must be done on the server). Base64URL uses
-/_ instead of standard Base64’s +//, and the tool auto-pads. A JWT has three segments separated by .; other segment counts trigger an error. exp, iat and nbf are Unix timestamps (seconds) that are compared to the current time.Privacy & Security
Parsing runs entirely in your browser and no token content is uploaded. Note, however, that a production token is effectively a user credential — avoid leaking it on public devices or in public chat tools.