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.
<!DOCTYPE html> < html > < head > < title > JavaScript | Add a key/value pair to JSON object </ title > </ head > < body style = "text-align:center;" > < h1 style = "color:green;" > GeeksForGeeks </ h1 > < p id = "GFG_up" style = " font-weight: bold" > </ p > < button onclick = "Geeks()" > Click to add </ button > < p id = "GFG_down" style="color:green; font-weight: bold" ;> </ 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 > </ body > </ html > |
Output:
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Before clicking on the button:
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After clicking on the button:
Example 2: This example adds {“prop_4” : “val_4”} to the GFG_p object by using square bracket notation.
<!DOCTYPE html> < html > < head > < title > JavaScript | Add a key/value pair to JSON object </ title > </ head > < body style = "text-align:center;" > < h1 style = "color:green;" > GeeksForGeeks </ h1 > < p id = "GFG_up" style = " font-weight: bold" > </ p > < button onclick = "Geeks()" > Click to add </ button > < p id = "GFG_down" style="color:green; font-weight: bold" ;> </ 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 > </ body > </ html > |
Output:
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Before clicking on the button:
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After clicking on the button: