Convert an Object{} to an Array[] of key-value pairs in Javascript

While working with javascript objects and arrays, the generic requirement developers encounter is converting an object to an array of key-value pairs. This article demonstrates easy ways to convert objects to an array of key-value pairs in javascript using different methods and example illustrations.

Table of Contents:

Convert an Object{} to an Array[] of Key-Value Pairs in Javascript using Object.keys()

Javascript’s Object.keys() returns an array of enumerable property names of the object.

Example 1:-

Convert the object { personFirstName: ‘George’, personLastName: ‘Smith’, dateOfBirth: “Nov 14 1984”, age: 37} to an array of key-value pairs

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Code:-

let myObject =  { personFirstName: 'George', personLastName: 'Smith', dateOfBirth: "Nov 14 1984", age: 37};
var key_value_pair = Object.keys(myObject).map((key) => [key, myObject[key]]);
console.log(key_value_pair);

Output:-

[
  [ 'personFirstName', 'George' ],
  [ 'personLastName', 'Smith' ],
  [ 'dateOfBirth', 'Nov 14 1984' ],
  [ 'age', 37 ]
]

Example 2:-

Convert the object {1: ‘George’, 2: ‘Will’, 3: ‘Patrick’, 4: ‘Barbara’} to an array of key-value pairs

Code:-

let myObject =  { 1: 'George', 2: 'Will', 3: 'Patrick', 4: 'Barbara'};
var key_value_pair = Object.keys(myObject).map((key) => [key, myObject[key]]);
console.log(key_value_pair);

Output:-

[
  [ '1', 'George' ],
  [ '2', 'Will' ],
  [ '3', 'Patrick' ],
  [ '4', 'Barbara' ]
]

Convert an Object{} to an Array[] of Key-Value Pairs in Javascript using Object.entries()

Javascript’s Object.entries() returns an array of enumerable key-value pairs of the object.

Example 1:-

Convert the object { personFirstName: ‘George’, personLastName: ‘Smith’, dateOfBirth: “Nov 14 1984”, age: 37} to an array of key-value pairs

Code:-

let myObject =  { personFirstName: 'George', personLastName: 'Smith', dateOfBirth: "Nov 14 1984", age: 37};
var key_value_pair = Object.entries(myObject);
console.log(key_value_pair);

Output:-

[
  [ 'personFirstName', 'George' ],
  [ 'personLastName', 'Smith' ],
  [ 'dateOfBirth', 'Nov 14 1984' ],
  [ 'age', 37 ]
]

Example 2:-

Convert the object {1: ‘George’, 2: ‘Will’, 3: ‘Patrick’, 4: ‘Barbara’} to an array of key-value pairs

Code:-

let myObject =  { 1: 'George', 2: 'Will', 3: 'Patrick', 4: 'Barbara'};
var key_value_pair = Object.entries(myObject);
console.log(key_value_pair);

Output:-

[
  [ '1', 'George' ],
  [ '2', 'Will' ],
  [ '3', 'Patrick' ],
  [ '4', 'Barbara' ]
]

I hope this article helped you to convert an object to an array of key-value pairs in javascript. Good Luck !!!

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