TypeScript Tutorials

How to Convert a JSON String to a Map in TypeScript

How to Convert a JSON String to a Map in TypeScript ?

Answer

To convert a JSON string to a map in TypeScript, you can use the JSON.parse method to parse the JSON string into an object and then convert the object into a Map.

✐ Examples

1 Converting a JSON String to a Map

We can convert a JSON string to a map in TypeScript by using the JSON.parse method to parse the JSON string into an object and then converting the object into a Map.

For example,

We start by defining a JSON string containing key-value pairs.
We use the JSON.parse method to parse the JSON string into an object.
We create a new Map by passing the object's entries (key-value pairs) to the Map constructor.
We print the resulting map to the console to verify the conversion.

TypeScript Program

const jsonString = '{"1": 10, "2": 20, "3": 30, "4": 40, "5": 50}';

// Parse the JSON string into an object
const jsonObject = JSON.parse(jsonString);

// Create a new Map from the object's entries
const myMap = new Map<string, number>(Object.entries(jsonObject).map(([key, value]) => [key, Number(value)]));

// Print the resulting map
console.log('Map from JSON string:');
myMap.forEach((value, key) => {
    console.log(`${key}: ${value}`);
});

Output

Map from JSON string:
1: 10
2: 20
3: 30
4: 40
5: 50

Summary

In this tutorial, we learned How to Convert a JSON String to a Map in TypeScript language with well detailed examples.

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