Make sure you are running an HTTP proxy on 127.0.0.1:8080 I suggest Burpsuite, Free Edition: https://portswigger.net/burp/download.html
I wrote this in Bash, not because it was easy, but because it was fast. This script lets you max out your CPU and network resources far better than Burpsuite, or a stand-alone python script, by taking advantage of the parallel program, and the many decades of C code optimization that's gone into Bash and GnuUtils.
[enumerate_url.sh]
#!/bin/bash
curlJsonEnum(){