Online JWT Decoder
Decode and inspect JSON Web Tokens (JWT) instantly in your browser.
Understanding JSON Web Tokens (JWT)
JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed.
Our free Online JWT Decoder allows developers to quickly inspect the header and payload sections of any JWT without sending sensitive authorization tokens to remote servers.
Structure of a JSON Web Token
A JWT is structured into three parts separated by dots (.):
1. Header
Consists of the type of token (JWT) and the signing algorithm being used, such as HMAC SHA256 or RSA.
2. Payload
Contains the claims, which include statements about an entity (typically, the user) and additional metadata like expiration times.
3. Signature
Used to verify that the sender of the JWT is who it says it is and to ensure that the message wasn't changed along the way.
Features of MicroToolStack's JWT Decoder
- Client-Side Security: All token decoding occurs locally inside your browser ensuring 100% data privacy.
- Instant Inspection: View header metadata and claims payload formatted clearly.
- Developer Friendly: Fully responsive interface optimized for desktop and mobile screens.
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Frequently Asked Questions (FAQs)
How does this JWT Decoder work?
Paste your encoded token into the input field and click Decode. The tool parses the base64url segments to reveal the underlying JSON header and payload data.
Is my token stored on your servers?
No. All parsing happens entirely within your local browser environment.
Is this tool free to use?
Yes, MicroToolStack's JWT Decoder is 100% free with no registration required.