JavaScript Object Notation (JSON)

What is JSON?

• JSON stands for JavaScript Object Notation
• JSON is lightweight format for storing & transporting data.
• JSON is “Self-describing” and easy to understand
• JSON is often Used when data is sent from a server to a web page.

JSON Example

Here is defines an instaChannel object: an array of 3 channel records (objects)

{  
    "InstaChannels" : [
      {
          "firstName": "Nazmulalbiswas Dev",
          "ChannelName": "@nazmulalibiswas"
      },
      {
          "firstName": "Ali Dev",
          "ChannelName": "@alijavaScript"
      },
      {
          "firstName": "Biswas Dev",
          "ChannelName": "@biswasjavaScript"
      },
      {
          "firstName": "Team Dev",
          "ChannelName": "@teamjavaScript"
      },
   ]
}

Keys & Values

The two parts that make up JSON are keys and values

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Together they make a key/value pair:

1. Key: A key is always a string enclosed in quotation marks
2. Value: A value can be string, number, Boolean expression, array or object

"firstName": "Nazmulalbiswas Dev",

The key is “firstName” & value is “Nazmulalibiswas Dev”

JSON.parse()

When receiving data from a web server, the data is always a string

'{"name: "Ali", "age": ="18", "country": "Bangladesh"}';

let obj = JSON.parse('{"name: "Ali", "age": ="18", "country": "Bangladesh"}');

JSON.stringify()

The JSON.stringify() method convert a javaScript object or value to JSON string. Opthonally replacing including only the specified properties if a replacer array is specified.

'{
    "name": "Ali",
    "age": "18",
    "country": "Bangladesh"
}'

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