Client-Side JSON Web Token (JWT) Inspection & Debugging
JSON Web Tokens (JWT), defined in RFC 7519, are the open industry standard for securely representing claims between two parties in modern authentication flows (such as OAuth 2.0 and OpenID Connect). A typical compact JWT consists of three parts separated by periods (header.payload.signature).
WebTorq's JWT Decoder provides an instant, secure way to inspect the claims, scopes, and expiration dates packed inside access and identity tokens. Because decoding executes entirely in local browser memory without network calls, your sensitive session tokens remain strictly confidential.
Understanding JWT Token Architecture
1. Header Segment
Specifies the cryptographic signing algorithm (such as HS256, RS256, or ES256) and token type (JWT).
2. Payload (Claims)
Contains the decoded claims including user ID (sub), permissions, custom roles, and expiration (exp).
3. Signature
The cryptographic hash ensuring authenticity. Note that this tool decodes payload content and does not perform signature key verification.
Related Developer Security Utilities
- Convert token expiration timestamps with the Epoch Converter.
- Format and validate decoded JSON payload structures using the JSON Formatter.
- Decode raw Base64 data with our Base64 Decoder.