Serialization and Deserialization in JavaScript

In JavaScript, data often needs to be stored or transferred efficiently.
This is where serialization and deserialization come into play.

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What is Serialization?

Serialization is the process of converting a JavaScript object into a structured format (usually a string).

The most common serialization format is JSON (JavaScript Object Notation) — it’s easy for both humans and machines to read and write.

Example

const data = {
  name: "Renil",
  age: 20,
  city: "Rajkot"
};

// Convert object -> String (JSON) (serialization)
const serializedData = JSON.stringify(data);
console.log(serializedData);
// Output: {"name":"Renil","age":20,"city":"Rajkot"}

Now, our data is in a JSON string format.

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What is Deserialization?

Deserialization is the process of converting serialized data (a JSON string) back into a JavaScript object, so it can be used in the program.

Example

// Convert JSON string back to a JavaScript object (deserialization)
const deserializedData = JSON.parse(serializedData);
console.log(deserializedData);
// Output: { name: 'Renil', age: 20, city: 'Rajkot' }

Now, our data is reconstructed.

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Why serialization and deserialization is important in js

serialization and deserialization are used for copying objects in JavaScript. When you assign an object to another variable, it creates a reference, not a new copy. To create a deep copy (a completely independent object), serialization and deserialization can be used.

let original = { name: "Renil", age: 20 };
let copy = JSON.parse(JSON.stringify(original));

copy.age = 25;
console.log(original.age); // 30

Here, JSON.stringify() serializes the object into a string, and JSON.parse() deserializes it back into a new object. This ensures copy is independent of original.

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