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JWT Decoder
Decode and inspect JSON Web Tokens.
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About JWT Decoder
A JSON Web Token (JWT) is a compact, URL-safe token format used to securely transmit claims between parties. It consists of three Base64-encoded parts separated by dots: a header (algorithm and type), a payload (claims like user ID, roles, and expiry), and a signature. JWTs are the standard for stateless authentication in modern web applications and APIs.
How to Use
Paste your JWT token into the input field. The tool automatically decodes and displays the header and payload sections as formatted JSON. It also checks the expiration claim and warns you if the token has expired. All decoding happens locally in your browser — your token is never sent to any server.
Common Use Cases
- Inspecting JWT claims during authentication debugging
- Verifying token expiration times and issued-at dates
- Checking user roles and permissions embedded in tokens
- Debugging OAuth 2.0 and OpenID Connect token flows
- Reviewing the signing algorithm used in the token header
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Frequently Asked Questions About JWT Decoder
What is JWT Decoder?
JWT Decoder is a free online tool on akousa.net, a platform with 453+ browser-based utilities. Decode and inspect JSON Web Tokens. It runs entirely in your browser with no installation, signup, or data upload to any server.
How do I use JWT Decoder?
Simply open JWT Decoder on akousa.net, enter or upload your data, configure any options, and click the action button. Results appear instantly in your browser.
Is JWT Decoder free?
Yes, JWT Decoder is completely free to use with no limitations. There is no signup, no ads, and no file size restrictions. All 453+ tools on akousa.net are free and open to everyone.