JWT Claims Viewer is an offline desktop RFC-7519 token header and JSON claims payload decoder, tree formatter, timestamp inspector, and test fixture composer for Linux developers. Parse dot-separated Base64URL segments locally on your workstation to read structured header and payload JSON trees, convert numeric epoch claims into UTC and local timestamps with live expiry countdowns, check RFC-7519 registered claim fields, and generate unsigned local development fixtures.

Key Features:

• Offline Token Header & Payload Decoder: Decodes Base64URL header and payload segments into formatted color-coded JSON trees and computes UTC and local timestamps for exp, iat, and nbf with live Active, Expired, and Future badges.
• Claims Table & Structure Linter: Explains standard RFC-7519 registered claims (iss, sub, aud, exp, nbf, iat, jti, scope) and highlights missing expiry fields or malformed JSON segments.
• Sample Test Payload Composer & Report Exporter: Interactive JSON payload composer encoding unsigned Base64URL segments for local API development fixtures along with CSV and JSON inspection report export.

Disclaimer: JWT Claims Viewer is an independent open-source project by TC Studio and is not affiliated with, endorsed by, or sponsored by any third-party developer tool vendor.