Remove key-value from object JavaScript

You can use the delete operator to Remove key-value from object JavaScript. When only a single key is to be removed we can directly use the delete operator specifying the key in an object.

delete(object_name.key_name);
// or
delete(object_name[key_name]);

Remove key-value from object JavaScript example

In simple example code to remove the key-value pair with key ‘b’, we use the delete operator followed by the object name and the key we want to remove. After deleting the key-value pair, we print the modified object to the console using console.log().

<!DOCTYPE html>
<html>

<body>
  <script >
    let obj = {a: 1, b: 2, c: 3};

    // removes the key-value pair with key 'b'
    delete obj.b; 

    console.log(obj);

  </script>
</body>
</html>

Output:

Another example

<!DOCTYPE html>
<html>

<body>
  <script >
    var myObj = {
      Name: "John",
      Age: 30,
      Sex: "Male",
      Work: "Coder",
      YearsOfExperience: 6,
      Address: "Bangalore"
    };
      
    console.log("After removal: ");
   
    delete (myObj.Address); // Or delete(myObj[Address]);
    console.log(myObj);
  </script>
</body>
</html>

Output:

JavaScript key-value pair from an object

Remove the key-value pair from an object having values as another array of objects.

var valGroup = {
    "Tier1": [
        {
            "DE": 0,
            "CreditRange": "0",
            "VintageCriteria": [],
            "DBR": 0,
            "NetsalesCriteria": [],
            "ABBmultiplier": 0,
            "BTO": 0,
            "MUE": [],
            "TurnoverCriteria": 0,
            "DSCR": 0,
            "category": "Tier1"
        },
        {
            "DE": 0,
            "CreditRange": "0",
            "VintageCriteria": [],
            "DBR": 0.8,
            "NetsalesCriteria": [],
            "ABBmultiplier": 0,
            "BTO": 0,
            "MUE": [],
            "TurnoverCriteria": 0,
            "DSCR": 0,
            "category": "Tier1"
        }
    ],
    "Tier2": [
        {
            "DE": 0,
            "CreditRange": "0",
            "VintageCriteria": [],
            "DBR": 0,
            "NetsalesCriteria": [],
            "ABBmultiplier": 0,
            "BTO": 0,
            "MUE": [],
            "TurnoverCriteria": 0,
            "DSCR": 0,
            "category": "Tier2"
        },
        {
            "DE": 0,
            "CreditRange": "",
            "VintageCriteria": [],
            "DBR": 0,
            "NetsalesCriteria": [],
            "ABBmultiplier": 0,
            "BTO": 0,
            "MUE": [],
            "TurnoverCriteria": 0,
            "DSCR": 0,
            "category": "Tier2"
        }
    ]
}

const result = Object.fromEntries([
    ...Object.keys(valGroup)
        .map(key => [key, valGroup[key].map(({category, ...rest}) => rest)])
])

console.log(result);

Output:

{
  "Tier1": [
    {
      "DE": 0,
      "CreditRange": "0",
      "VintageCriteria": [],
      "DBR": 0,
      "NetsalesCriteria": [],
      "ABBmultiplier": 0,
      "BTO": 0,
      "MUE": [],
      "TurnoverCriteria": 0,
      "DSCR": 0
    },
    {
      "DE": 0,
      "CreditRange": "0",
      "VintageCriteria": [],
      "DBR": 0.8,
      "NetsalesCriteria": [],
      "ABBmultiplier": 0,
      "BTO": 0,
      "MUE": [],
      "TurnoverCriteria": 0,
      "DSCR": 0
    }
  ],
  "Tier2": [
    {
      "DE": 0,
      "CreditRange": "0",
      "VintageCriteria": [],
      "DBR": 0,
      "NetsalesCriteria": [],
      "ABBmultiplier": 0,
      "BTO": 0,
      "MUE": [],
      "TurnoverCriteria": 0,
      "DSCR": 0
    },
    {
      "DE": 0,
      "CreditRange": "",
      "VintageCriteria": [],
      "DBR": 0,
      "NetsalesCriteria": [],
      "ABBmultiplier": 0,
      "BTO": 0,
      "MUE": [],
      "TurnoverCriteria": 0,
      "DSCR": 0
    }
  ]
}

Do comment if you have any doubts or suggestions on this JS object topic.

Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version

Remove key-value from object JavaScript