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Working with JSON Data in Node.js

Working with JSON Data in Node.js

Working with JSON data in Node.js is a common task, especially when dealing with APIs or reading/writing configuration files. Node.js provides built-in modules to handle JSON data. Here's an overview of how to work with JSON data in Node.js:

Parsing JSON:

1. Parsing JSON from a String:

To parse JSON data from a string, you can use JSON.parse():

const jsonString = '{"name": "John Doe", "age": 30}';
const parsedData = JSON.parse(jsonString);
console.log(parsedData.name); // Output: John Doe
 

2. Reading JSON from a File:

If you have a JSON file, you can read and parse it using the fs module:

const fs = require('fs');

fs.readFile('data.json', 'utf8', (err, data) => {
  if (err) {
    console.error(err);
    return;
  }
  const parsedData = JSON.parse(data);
  console.log(parsedData);
});
 

Creating JSON:

1. Creating JSON from JavaScript Objects:

You can create a JavaScript object and convert it to JSON using JSON.stringify():

const data = {
  name: 'John Doe',
  age: 30
};

const jsonString = JSON.stringify(data);
console.log(jsonString); // Output: {"name":"John Doe","age":30}
 

Modifying JSON:

1. Modifying JSON Data:

To modify JSON data, you first need to parse it, make the necessary changes, and then stringify it back:

const jsonString = '{"name": "John Doe", "age": 30}';
const parsedData = JSON.parse(jsonString);

// Modify data
parsedData.age = 31;

const updatedJsonString = JSON.stringify(parsedData);
console.log(updatedJsonString); // Output: {"name":"John Doe","age":31}
 

2. Writing JSON to a File:

To save JSON data to a file, you can use the fs.writeFile() function:

 
const fs = require('fs');

const data = {
  name: 'John Doe',
  age: 31
};

const jsonString = JSON.stringify(data);

fs.writeFile('data.json', jsonString, 'utf8', (err) => {
  if (err) {
    console.error(err);
    return;
  }
  console.log('Data written to file');
});
 

Handling Errors:

When working with JSON data, it's important to handle potential errors, especially when parsing data from external sources or reading files.

try {
  const parsedData = JSON.parse(jsonString);
  console.log(parsedData);
} catch (error) {
  console.error('Error parsing JSON:', error);
}