A JWT Decoder is an essential online tool that allows developers, QA engineers, and security testers to quickly decode and inspect JSON Web Tokens without exposing secrets. Our JWT Decoder web page helps you view the token header, payload (claims), algorithm (HS256, RS256, etc.), expiration time (exp), issuer (iss), audience (aud), subject (sub), roles, scopes, and custom application claims in a clean, user-friendly interface. This improves debugging of authentication and authorization issues, speeds up API testing, and supports verification of multi-tenant, role-based, and secure access implementations. Use the decoder to validate token structure, confirm expiry timing, compare refreshed tokens, and ensure sensitive data is not improperly included in plaintext claims. Designed for modern web, mobile, and microservices architectures, this JWT analysis tool enhances productivity, strengthens security hygiene, and supports SEO queries such as “decode JWT online,” “inspect JSON Web Token,” “verify JWT claims,” and “analyze access token for QA.”