# JSON-to-data conversion in JavaScript

Using the `JSON.parse` method, you can convert JSON to a JavaScript data structure. Let's look at an example.

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

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

Let's convert our string to an array:

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

If the string contains invalid JSON, our method will throw an error:

`let json = '[1, 2, 3, 4, 5,]'; // invalid JSON let arr = JSON.parse(json); // throws an error`

Given a JSON string containing an array of numbers:

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

Convert this string to a real JavaScript array and find the sum of the numbers of this array.

Given a JSON string containing an object with data:

`let json = `{ "data1": [1,2,3], "data2": [4,5,6], "data3": [7,8,9] }`;`

Find the sum of numbers from the given data.

Given a JSON string containing usernames:

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

Output these names as an `ul` list.

Given a JSON string, containing an array with employees data:

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

Display these employees in the form of an HTML table.

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