Paste your JWT token
Copy and paste your JSON Web Token into the JWT decoder input. The tool automatically detects the three JWT segments (header, payload, signature) separated by dots and prepares them for decoding.
JWT Decoder
Decode any JSON Web Token (JWT) to inspect its header, payload, and signature information. Paste a JWT string and instantly see the decoded header and payload as formatted JSON. Perfect for debugging authentication flows, verifying token contents, and learning JWT structure.
Workspace
Use the tool below. Your inputs stay local when the tool supports browser-only processing.
Workflow
How to use the JWT Decoder
View decoded header and payload
The JWT decoder instantly shows the decoded header (token type and signing algorithm) and payload (claims like subject, issuer, and expiration) as formatted, readable JSON objects for easy inspection.
Copy decoded data
Use the copy buttons to grab the decoded header or payload JSON. The JWT decoder is perfect for debugging authentication issues, verifying token contents during development, and learning about JWT structure.
Decode JWT Tokens Safely
The JWT decoder reads the header and payload locally in your browser. This helps developers inspect authentication claims without sending tokens to a remote debugging service.
What the Tool Does Not Do
Decoding a JWT is not the same as verifying trust. This tool displays token content for debugging, but production verification must still check signatures, issuers, audiences, and expiration rules.
Developer Use Cases
Use the decoder while debugging OAuth, OpenID Connect, API sessions, test environments, and claim mappings. Avoid pasting live production secrets unless you understand the risk.
JWT Decoder — Frequently Asked Questions
Is the JWT decoder safe to use with production tokens?
Yes, the JWT decoder runs entirely in your browser — no data is sent to any server. Your JWT tokens, including any sensitive claims in the payload, never leave your device, making it safe for debugging production authentication tokens.
Does the JWT decoder verify token signatures?
The JWT decoder decodes and displays the header and payload but does not verify cryptographic signatures. For signature verification, you need the secret key or public key used to sign the token, which is a server-side operation.