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Working with JSON and Local Storage in JavaScript

bookStringifying JavaScript Objects


              
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const user = {
  name: "Alice",
  age: 30,
  hobbies: ["reading", "biking"],
  isMember: true
};

const jsonString = JSON.stringify(user);
console.log(jsonString);
// Output: {"name":"Alice","age":30,"hobbies":["reading","biking"],"isMember":true}
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When you need to store or transmit a JavaScript object, you must first convert it into a string format. This process is called stringification. In JavaScript, you use the JSON.stringify method to turn an object into a JSON string. The result is a plain string that contains your data in JSON format, which is easy to save, send, or store.

The JSON.stringify function can also take two optional parameters to give you more control over the output. The second parameter, called replacer, lets you specify which properties should be included or filtered out. The third parameter, called space, is useful for formatting the output with indentation and line breaks, making the JSON string easier to read. For example, passing 2 as the third argument will add two spaces of indentation to each level in the output string.

1. What is the purpose of JSON.stringify?

2. Which parameter in JSON.stringify can be used to format the output?

question mark

What is the purpose of JSON.stringify?

Select the correct answer

question mark

Which parameter in JSON.stringify can be used to format the output?

Select the correct answer

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bookStringifying JavaScript Objects

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12345678910

            
const user = {
  name: "Alice",
  age: 30,
  hobbies: ["reading", "biking"],
  isMember: true
};

const jsonString = JSON.stringify(user);
console.log(jsonString);
// Output: {"name":"Alice","age":30,"hobbies":["reading","biking"],"isMember":true}
copy

When you need to store or transmit a JavaScript object, you must first convert it into a string format. This process is called stringification. In JavaScript, you use the JSON.stringify method to turn an object into a JSON string. The result is a plain string that contains your data in JSON format, which is easy to save, send, or store.

The JSON.stringify function can also take two optional parameters to give you more control over the output. The second parameter, called replacer, lets you specify which properties should be included or filtered out. The third parameter, called space, is useful for formatting the output with indentation and line breaks, making the JSON string easier to read. For example, passing 2 as the third argument will add two spaces of indentation to each level in the output string.

1. What is the purpose of JSON.stringify?

2. Which parameter in JSON.stringify can be used to format the output?

question mark

What is the purpose of JSON.stringify?

Select the correct answer

question mark

Which parameter in JSON.stringify can be used to format the output?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 2. Kapitel 1
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