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Decode JSON Web Tokens (JWT/JWS), inspect header algorithms and payload claims, validate expiration timestamps, and debug OAuth2/OIDC bearer tokens with 100% browser-local privacy.
Paste any standard encoded JSON Web Token into the input field, or click Load Sample to test with an example token.
Our client-side Base64Url engine instantly splits and parses the Header, Payload, and Signature, rendering human-readable timestamps and claim tables.
Copy formatted Header or Payload JSON objects directly into your clipboard for backend debugging or testing without privacy concerns.
Your secret authentication tokens and authorization payloads are decoded strictly client-side. Zero server calls, zero network tracking.
Automatically analyzes exp (expiration), nbf (not before), and iat (issued at) timestamps with human-readable status indicators and relative timers.
Visually separates Header (algorithm/type), Payload (claims/data), and Signature sections for intuitive debugging.
Detailed tabular breakdown of standard OAuth2/OIDC claims including iss, sub, aud, exp, and custom scopes.
Copy individual decoded JSON objects (Header, Payload) or the full decoded representation with one click.
Test immediately with a pre-configured sample token to inspect claims before loading your own tokens.
Our JWT Decoder & Inspector engine is open source under HiMat Technology. Star the project, inspect the source, report issues, or contribute on GitHub.
JWT tokens often contain sensitive user session data, scopes, email addresses, and tenant IDs. Traditional online token decoders send your tokens to remote web servers where logs can capture them. HiMat's JWT Inspector executes Base64Url decoding 100% client-side in your local browser sandbox, guaranteeing that your authentication secrets never leave your machine.
No. The HiMat JWT Decoder operates 100% locally inside your browser using standard JavaScript Base64Url decoding. Your JWT tokens, bearer headers, and authentication claims never leave your device.
Our decoder parses and validates token structure and claim timestamps client-side. Secret signature verification key checking runs entirely in your browser memory without sending keys to a backend server.
Any standard RFC 7519 JSON Web Token encoded with Base64Url encoding (including HS256, HS384, HS512, RS256, ES256, PS256) can be decoded and inspected.
Yes, 100% free with no registration required, no daily rate limits, and zero ads.
HiMat Technologies designs zero-trust platform architecture, OAuth2/OIDC identity management, and secure cloud SDLC systems for enterprise applications.