JWT Editor is a Burp Suite extension for editing, signing, verifying, encrypting and decrypting JSON Web Tokens (JWTs).

It provides automatic detection and in-line editing of JWTs within HTTP requests/responses and web socket messages, signing and encrypting of tokens and automation of several well-known attacks against JWT implementations.

It was written originally by Fraser Winterborn, formerly of BlackBerry Security Research Group. The original source code can be found here.

For further information, check out the repository here.