JWT Decode & Validate

Instantly decode and verify JWT tokens. Explore headers, payloads, and signatures in real-time.

JWT Decode & Validate


          
        

      

    


    
    
    


						

				

					

				

		

					

				

				

					
What is JWT Decode & Validate?
				

				

				

				

									
JWT Decode & Validate is a powerful and secure online tool that helps you instantly decode, inspect, and validate JSON Web Tokens (JWTs) directly in your browser. Whether you’re a developer, security engineer, or API integrator, this tool gives you full visibility into token structure and helps ensure token integrity without relying on external services.
JWTs are widely used in modern web applications for authentication, authorization, and secure information exchange between parties. Each JWT contains a header, payload, and signature, often encoded using base64url. This tool allows you to break down each section in real time, so you can inspect the claims, verify the algorithm used, and check if the token is expired or tampered with.
Our tool supports HMAC-based algorithms like HS256, HS384, and HS512, enabling real-time signature verification using a secret key you provide. It also recognizes advanced algorithms like RS256, ES256, and PS512, commonly used in enterprise-level applications, and gracefully handles their structure even if validation requires external tools.
This JWT validator is ideal for debugging authentication issues, building secure API flows, or simply learning how JWTs work under the hood. You can edit the decoded header and payload, and the tool will automatically regenerate a new token (if possible) using your selected algorithm and secret. All decoding and validation are handled locally in your browser, ensuring speed and privacy with no data sent to any server.
								

				

				

				

					
Key features include
				

				

				

				

									
– Real-time JWT decoding with automatic formatting
– Visual inspection of header, payload, and signature
– Token expiration check with visual status badge
– Signature validation using your secret key (for HS algorithms)
– Full support for standard algorithms including RS, ES, PS
– Copy and reuse individual components with one click
Whether you’re handling JWTs in OAuth2 flows, OpenID Connect integrations, or microservice architectures, this tool helps you troubleshoot issues and understand what’s going on inside every token.
								

				

				

				

					
How to use the JWT Tool?
				

				

				

				

									
Using our JWT Decoder & Validator is straightforward:
  1. Paste your JWT into the token input field.
  2. The tool will instantly decode and display the token’s header, payload, and signature.
  3. If you want to validate the signature, select the correct algorithm and provide the secret key.
  4. You can edit the payload or header directly — if a valid secret is provided, the token will be re-signed automatically.
  5. Use the Copy buttons to export any part of the token, or verify its expiration and integrity at a glance.
Whether you’re building secure web apps, debugging tokens from a third-party API, or just curious about JWT internals, this tool offers everything you need – no installation, no tracking, just pure client-side power.