REST API vs JSON

Question

I've found lots of questions and answers on REST API vs SOAP API.

Some of them like this one mention JSON.

Could you explain what is the difference between REST API vs JSON. (aka create custom module, controller and send JSON)

REST API can also output JSON, right? So why it's marked as separate category.

What is the difference in usage between both approaches. What are pros and cons. Please provide example if possible.

Answer 1

Magento framework API has built in:

• authentication & permissions
• error handling
• you can call your existing models metods directly, no need to create more "special" controllers.

Creating own "json" API is like building your own car. Of course you can do it, but better, faster and cheaper is to use existing one ;)