JavaScript How to add an element to a JSON object ?
In order to add Key/value pair to a JSON object, Either we use dot notation or square bracket notation. Both methods are widely accepted.
Example 1: This example adds {“prop_4” : “val_4”} to the GFG_p object by using dot notation.
html
< h1 style = "color:green;" > GeeksforGeeks </ h1 > < p id = "GFG_up" > </ p > < button onclick = "Geeks()" > Click to add </ button > < p id = "GFG_down" > </ p > < script > var GFG_p = { prop_1: "val_1", prop_2: "val_2", prop_3: "val_3" }; var p_up = document.getElementById("GFG_up"); var p_down = document.getElementById("GFG_down"); p_up.innerHTML = JSON.stringify(GFG_p); function Geeks() { GFG_p.prop_4 = "val_4"; p_down.innerHTML = JSON.stringify(GFG_p); } </ script > |
Output:

JavaScript | How to add an element to a JSON object?
Example 2: This example adds {“prop_4” : “val_4”} to the GFG_p object by using square bracket notation.
html
< h1 style = "color:green;" > GeeksforGeeks </ h1 > < p id = "GFG_up" > </ p > < button onclick = "Geeks()" > Click to add </ button > < p id = "GFG_down" > </ p > < script > var GFG_p = { prop_1: "val_1", prop_2: "val_2", prop_3: "val_3" }; var p_up = document.getElementById("GFG_up"); var p_down = document.getElementById("GFG_down"); p_up.innerHTML = JSON.stringify(GFG_p); function Geeks() { GFG_p["prop_4"] = "val_4"; p_down.innerHTML = JSON.stringify(GFG_p); } </ script > |
Output:

JavaScript | How to add an element to a JSON object?
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