JSON

JavaScript Object Notation

Why JSON?

Example JSON object

  {
    "Image": {
        "Width":  800,
        "Height": 600,
        "Title":  "View from 15th Floor",
        "Thumbnail": {
            "Url":    "http://www.example.com/image/481989943",
            "Height": 125,
            "Width":  100
        },
        "Animated" : false,
        "IDs": [116, 943, 234, 38793]
      }
  }

Its Image member is an object whose Thumbnail member is an object and whose IDs member is an array of numbers.

(from the spec)

Example JSON array

[
    {
       "precision": "zip",
       "Latitude":  37.7668,
       "Longitude": -122.3959,
       "Address":   "",
       "City":      "SAN FRANCISCO",
       "State":     "CA",
       "Zip":       "94107",
       "Country":   "US"
    },
    {
       "precision": "zip",
       "Latitude":  37.371991,
       "Longitude": -122.026020,
       "Address":   "",
       "City":      "SUNNYVALE",
       "State":     "CA",
       "Zip":       "94085",
       "Country":   "US"
    }
]

(from the spec)

Viewing JSON in Browser

json viewer screenshot

Viewing JSON in NodeJS Console


$ node
> { "Image": { "Width":  800, "Height": 600, "Title":  "View from 15th Floor", "Thumbnail": { "Url":    "http://www.example.com/image/481989943", "Height": 125, "Width":  100 }, "Animated" : false, "IDs": [116, 943, 234, 38793] } }
{ Image:
   { Width: 800,
     Height: 600,
     Title: 'View from 15th Floor',
     Thumbnail:
      { Url: 'http://www.example.com/image/481989943',
        Height: 125,
        Width: 100 },
     Animated: false,
     IDs: [ 116, 943, 234, 38793 ] } }

(beware multi-line strings though: https://github.com/nodejs/node/issues/21657 )

Parsing & Producing JSON

let text = '{ "name": "Ada Lovelace", "id": 1, "title": "The Queen of Numbers" }'

The following code converts the String data into a JavaScript object:

let data = JSON.parse(text)

And this converts a JavaScript object back into a String:

let newText = JSON.stringify(data)

Using POSTMAN

There are also many plugins for Postman that give you collections of comon requests for certain sites and APIs. These collections are stored on the sites themselves rather than on Postman.

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