# How to convert a multidimensional array into a single array

Published July 28, 2020

To convert a multidimensional or nested array into a single array or flatten the array we can use the `flat()` method available in the array.

Suppose you have a nested array like this,

``````// nested array
let arr = ["John Doe", ["Lily Rose", 23]];``````

Let's convert this array into a single array using the `flat()` method available in the array.

``````// nested array
let arr = ["John Doe", ["Lily Rose", 23]];

// convert nested array into single array
let convertedArr = arr.flat();

console.log(convertedArr); // ["John Doe", "Lily Rose", 23]``````

By default, `arr.flat()` method only converts nested arrays up to 1 level deep.

What if we have nested arrays which are 3 levels deep like this,

``````// nested array with 3 levels
let arr = ["John Doe", ["Lily Rose", ["salary", ["baseSalary", 23000]]]];``````

For this to convert into a single array we can pass the depth to which we want to convert the array as an argument to the `flat()` method.

``````// nested array with 3 levels
let arr = ["John Doe", ["Lily Rose", ["salary", ["baseSalary", 23000]]]];

// converted nested array into single array which is 3 levels deep
let convertedArr = arr.flat(3);

console.log(convertedArr); // ["John Doe", "Lily Rose", "salary", "baseSalary", 23000]``````