https://www.vulnsy.com/free-tools/burp-to-openapi

Burp2API converts your Burp Suite project into a JSON for usage with POSTMAN or SWAGGER editor.

There are currently two purposes for the creation of this tool:

• To provide clients with documentation for their own API (Anyone that does API testing knows the struggles)
• To save a history of the endpoints you used in previous testing which can be used for future testing.

This project is maintained by TurvSec

Here's what your JSON will look like in Swagger:

Here's what your JSON will look like in Postman:

Simply git clone and you're away:

git clone https://github.com/MrTurvey/Burp2API.git
cd Burp2API
python Burp2API <BurpXML>

With your BurpSuite project loaded:

• Click on the target tab, if you're not already there
• Right click the target you want to export
• Click "Save selected items"
• Ensure the "Base64-encode" checkbox is checked
• Save as burp_output.xml, or whatever you want

Now you have a Burp Suite output, you can use Burp2API:

python Burp2API burp_output.xml

The output will be

• filename.json
• filename.xml

You can view the JSON file with Swagger (link below) or you can import it into Postman using its import button.

https://editor.swagger.io

The tool is fresh, there are probably a lot of things that need fixing.