What are the Best Ways to Get the Key of a JavaScript Object?

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Oftentimes, we have to get the keys and values of a JavaScript object.

In this article, we’ll look at how to get the keys and values from an object.

We can use the Object.keys method to get the keys of an object.

It returns an array with the object’s string keys.

For instance, we can write:

const obj = {
  first: 'someVal',
  second: 'otherVal'
};
const keys = Object.keys(obj)
console.log(keys)

Then keys is [“first”, “second”] .

To get an object’s property values, we can use the Object.values method.

It returns an array with the object’s property values.

For example, we can write:

const obj = {
  first: 'someVal',
  second: 'otherVal'
};
const values = Object.values(obj)
console.log(values)

Then values is [“someVal”, “otherVal”] .

To get an array of key-value pair arrays of an object, we can use the Object.entries method.

For instance, we can write:

const obj = {
  first: 'someVal',
  second: 'otherVal'
};
const pairs = Object.entries(obj)
console.log(pairs)

Then pairs is:

[
  [
    "first",
    "someVal"
  ],
  [
    "second",
    "otherVal"
  ]
]

We can get a JavaScript’s object keys and values separately or together easily with some JavaScript object methods.

By John Au-Yeung