JSON + Javascript Cheatsheet.

Content

• Convert array to JSON
• Parse JSON (convert from JSON to array)
• Count JSON array length
• Do loop with JSON array
• Get data from JSON array
• Add item to JSON array
• Remove item from JSON array

Convert array to JSON

var myArr = {
    key: value,
    key2: value2
};

var myJSON = JSON.stringify(myArr);

Result:

'{"key":"value","key2":"value2"}';

Parse JSON (convert from JSON to array)

var myJSON = '{"key":"value","key2":"value2"}';

var myArr = JSON.parse(myJSON);

Result:

{
    key: value,
    key2: value2
};

Count JSON array length

var myJSON = '{"key":"value","key2":"value2"}';

var myArr = JSON.parse(myJSON);

var jsonLength = myArr.length;

Result:

2

Do loop with JSON array

var myJSON = '{"key":"value","key2":"value2"}';

var myArr = JSON.parse(myJSON);

myArr.forEach(function(nowItem) {
    // Do things here
})

Get data from JSON array

var myJSON = '{"key":"value","key2":"value2"}';

var myArr = JSON.parse(myJSON);

console.log(myArr["key2"]);

Result:

value2

Add item to JSON array

var myJSON = '{"key":"value","key2":"value2"}';

var myArr = JSON.parse(myJSON);

myArr["key3"] = "value3";

myArr result:

{
    key: "value", 
    key2: "value2", 
    key3: "value3"
}

Remove item from JSON array

var myJSON = '{"key":"value","key2":"value2"}';

var myArr = JSON.parse(myJSON);

delete myArr["key2"];

myArr result:

{
   "key": "value"
}