Build JWT Token
Header
Payload (Claims)
Secret Key
Used to sign the token. Keep this secret!
About JWT Tokens
JSON Web Tokens (JWT) are a compact, URL-safe means of representing claims between two parties. A JWT consists of three parts separated by dots:
- Header — Contains the token type and signing algorithm
- Payload — Contains the claims (user data and metadata)
- Signature — Verifies the token hasn't been tampered with
Common Claims:
iss— Issuer of the tokensub— Subject (usually user ID)aud— Audience (intended recipient)exp— Expiration time (Unix timestamp)iat— Issued at time (Unix timestamp)nbf— Not valid before time
Privacy & Limitations
- All calculations run entirely in your browser -- nothing is sent to any server.
- Results are computed locally and should be verified for critical applications.
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JWT Encoder FAQ
What is JWT Encoder?
JWT Encoder is a free developer tools tool that helps you Create and encode JWT tokens with custom claims.
How do I use JWT Encoder?
Enter your input values, review the calculated output, and adjust inputs until you reach the result you need. The result updates in your browser.
Is JWT Encoder private?
Yes. Calculations run locally in your browser. Inputs are not uploaded to a server by default, and refreshing the page clears session data.
Does JWT Encoder require an account or installation?
No. You can use this tool directly in your browser without sign-up or software installation.
How accurate are results from JWT Encoder?
This tool applies standard formulas or deterministic processing logic for estimates. For medical, legal, tax, or investment decisions, verify with a qualified professional.
Can I save or share outputs from JWT Encoder?
You can bookmark this page and copy outputs manually. Results are not persisted in your account and are typically not embedded in the URL.