Plugin for provide Configuration page or Dashboard for your mobile APP so you can add custom fields as many as you want and get data in Jason API. you just need to install and activate the plugin and add your data in custom fields tab under settings menu after that you need to create a post with jason API type and hit on front end of your post you get jason data of your fields.
Screenshots
You can add multiple fields of different type as many as you want and save data in it.
This picture shows that different fields with different type of data for your mobile app so you can define even your app layout in this plugin.
Create a new post using ‘Custom Fields API’ type for get Jason data.
Hit front end of your new post and you got Jason data for your mobile APP.
Hit front end of your new post and send identifier value then you get only that single fiels data.