Nadhebe

JWT Token Generator & Base64URL Encoder

JWT HEADER, PAYLOAD & SECRET KEY

ENCODED JWT TOKEN
Encoded JWT String 
 
  
  
  
 
 
   
    
 
 
JSON Web Token (JWT) Generation & Encoding Guide
 

JSON Web Tokens are widely used for stateless authentication in modern REST APIs, microservices, and OAuth 2.0 / OpenID Connect flows.

 
Structure of a JWT Token
 
     
  • Header: Defines algorithm (HS256) and token type (JWT).
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  • Payload: Contains entity claims (user ID, roles, expiration timestamp).
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  • Signature: Base64URL encoded signature computed using the secret key.
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Related Security Tools
 

Inspect JWT claims with the JWT Inspector, generate UUIDs with the UUID Generator, or test webhooks with the Webhook Signature Generator.

 
 
  
 
 
Frequently Asked Questions
 
Common questions about this tool.
 
 
 
  What is a JSON Web Token (JWT)? ▼  
 A JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact, self-contained way for securely transmitting information between parties as a JSON object. 
 
  What are the 3 parts of a JWT token string? ▼  
 A JWT consists of 3 Base64URL encoded strings separated by dots (`.`): Header, Payload, and Signature (`header.payload.signature`). 
 
  What is HMAC SHA-256 (HS256) signing? ▼  
 HS256 is a symmetric signing algorithm that uses a single secret key to create a cryptographic signature, verifying token authenticity. 
 
  What are standard claims in a JWT payload? ▼  
 Standard claims include `sub` (subject/user ID), `iss` (issuer), `aud` (audience), `iat` (issued at timestamp), and `exp` (expiration timestamp). 
 
  Is this JWT generator safe to use locally? ▼  
 Yes! Token generation and HMAC signing run 100% client-side using browser-native Web Crypto API primitives. Secret keys never leave your machine. 
 
 
 
  
 
 
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