Jetpack will allow you to authorize applications and services to securely connect to your blog and allow them to use your content in new ways and offer you new functionality.
To enable/disable the JSON API module, follow these steps:
- Go to Jetpack > Dashboard.
- Scroll down to the bottom of the page and click “Debug”.
- Click “Access the full list of Jetpack modules available on your site”.
- Hover over a module and click “Activate” or “Deactivate”.