How to Use curl to Send JSON Data in a POST Request?

Great tip about using `-d @filename.json`! I was manually typing out JSON for ages before I realized this. Another thing that helps is using tools like Postman or Insomnia to test your API calls before translating them to curl send json commands. Saves a ton of time debugging!

Also, if you're on Windows, watch out for escaping quotes. Powershell can be a pain with curl send json.