JSend

JSend (https://github.com/omniti-labs/jsend) is an extremely simple standard that covers three main categories of response: success, fail, and error. Each type further defines mandatory keys. For example, all three types require a status key. Success and fail require a data key. The error type requires a key called message. 

Here is an example of a successful response to a GET request:

{
    status : "success",
    data : {
        "posts" : [
            { "id" : "1111AAAA", "productKey" : "1111AAAA", "title" : "Chocolate Bunny" },
            { "id" : "2222BBBB", "productKey" : "2222BBBB", "title" : "Chocolate Donut" }
        ]
    }
}

Next, we will look at JSON:API.