# Changing JSON data in JavaScript

Let's say we have a string containing in array in JSON format:

`let json = '[1, 2, 3, 4, 5]';`

Let's add one more element to the end of this array. For this we need to take a number of steps.

First, we unpack the JSON into a JavaScript array:

`let arr = JSON.parse(json);`

Add a new element to the array:

`arr.push(6);`

And convert the modified array back to JSON:

`let res = JSON.stringify(arr);`

The final code will look like this:

`let json = '[1, 2, 3, 4, 5]'; let arr = JSON.parse(json); arr.push(6); let res = JSON.stringify(arr); console.log(res);`

The following JSON is given:

`let json = '["user1","user2","user3","user4","user5"]';`

Add another user to the end of the string.

The following JSON is given:

`let json = '["user1","user2","user3","user4","user5"]';`

Change the second user's name.

The following JSON is given:

`let json = `[ { "name": "user1", "age": 25, "salary": 1000 }, { "name": "user2", "age": 26, "salary": 2000 }, { "name": "user3", "age": 27, "salary": 3000 } ]`;`

Add one more employee to this string.

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