JWT Decoder
Decode and inspect JSON Web Tokens (JWT) without verification. View header, payload, and signature components in a readable format.
Useful for debugging authentication issues, inspecting token claims, or understanding JWT structure. This tool does NOT verify signatures or validate tokens.
⚠️ Header
Enter a JWT token above to see its decoded content
📦 Payload
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🔏 Signature
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Common Use Cases
Debug Authentication Issues
Quickly inspect JWT claims to troubleshoot login problems, expired tokens, or missing permissions.
Verify Token Expiration
Check the exp claim to see when a token expires without writing code.
Inspect User Claims
View user ID, roles, permissions, and custom claims embedded in the token payload.
Understand Token Structure
Learn how JWTs work by seeing the header (algorithm), payload (claims), and signature parts.
Frequently Asked Questions
What is a JWT (JSON Web Token)?
A JWT is a compact, URL-safe token format used for securely transmitting information between parties. It consists of three parts: a header (algorithm info), payload (claims/data), and signature (verification). JWTs are commonly used for authentication in APIs and single sign-on (SSO) systems.
Is it safe to paste my JWT here?
This tool only decodes JWTs — it does not verify or store them. Your token is processed server-side and immediately discarded. However, never share JWTs from production systems publicly, as they may contain sensitive user data.
Does this tool verify the JWT signature?
No. This is a decoder only — it shows you the contents of the token without verifying the signature. To verify a JWT, you need the secret key or public key used to sign it. Use this tool for debugging, not for security validation.