Static + Browser-Only
Decode JWT header and payload claims in your browser before sharing tokens in tickets, docs, AI prompts, or debugging threads.
This page helps you read JWT claims locally without relying on a remote token inspector.
Input
Output
What Is It
A JWT decoder turns the Base64 URL header and payload of a JSON Web Token into readable JSON so engineers can review claims, scopes, roles, timestamps, and token metadata.
Use Cases
exp, iat, role, and scope claimsWhy It Matters
JWTs often contain emails, user IDs, tenant IDs, scopes, and internal claims. Decoding them locally helps reduce unnecessary data leakage while following better redaction and privacy review practices.
FAQ
No. This page decodes the token only. Signature validation should happen in your auth stack or a dedicated validation flow.
Yes, but you should still avoid sharing decoded claims externally until they are reviewed and masked if necessary.
JWTs are often copied into tickets, chat threads, and docs because they look compact and harmless. In practice, decoded claims can expose PII, account identifiers, scopes, tenant information, or session context.
A browser-based JWT decoder helps teams inspect token content as part of industry-standard cyber hygiene before deciding what needs redaction, masking, or removal.
Examples
These examples show how a compact JWT becomes readable JSON in the browser.
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzAwMDEiLCJlbWFpbCI6ImpvaG4uZG9lQGV4YW1wbGUuY29tIiwicm9sZSI6ImFkbWluIn0.c2lnbmF0dXJl
{
"header": {"alg": "HS256", "typ": "JWT"},
"payload": {"sub": "user_0001", "email": "john.doe@example.com", "role": "admin"},
"signature": "c2lnbmF0dXJl"
}