Example code related to our blog post: Improving the Security of JSON Web Tokens (JWTs)

• Clone the rpository
• Run yarn in terminal
• Run yarn start in terminal

• Open http://localhost:3010
• Click on Get token button - this will gererate a JWT token
• Copy the token
• Paste the token to the textarea and click on Check token
• Token must be shown

• Open the url from another brower or another IP address
• Use the previously generated token
• Paste the token to the textarea and click on Check token
• Token will be invalid

• We added an extra security layer to the JWT.
• We verify the visitor IP address and the User-Agent string
• If any of them change, the token is unusable.