Introduction to LiveJSON

LiveJSON is a powerful JSON manipulation library that allows developers to interact with JSON data in a dynamic and real-time manner. The library boasts a rich set of APIs designed to make JSON processing smooth and efficient. From basic operations like reading and writing JSON data to advanced functionalities like schema validation and data transformation, LiveJSON has it all.

APIs and Code Examples

Initializing JSON Object

Initialize your JSON data using the init() method:

  const liveJson = require('livejson');
  let data = liveJson.init({
    "name": "John",
    "age": 30,
    "city": "New York"
  });

Accessing JSON Data

Retrieve data using the get() method:

  let name = data.get('name'); // returns John

Updating JSON Data

Update data with the set() method:

  data.set('age', 31);

Adding New Key-Value Pair

Use the add() method to add new key-value pairs:

  data.add('country', 'USA');

Deleting a Key-Value Pair

Delete data with the remove() method:

  data.remove('city');

Checking Key Presence

Check if a key exists using has():

  let hasCity = data.has('city'); // returns false

Listing All Keys

List all keys using keys():

  let keys = data.keys(); // returns ['name', 'age', 'country']

Converting to String

Convert JSON data to a string with toString():

  let jsonString = data.toString();

Schema Validation

Validate JSON data with a schema using validateSchema():

  let schema = {
    "type": "object",
    "properties": {
      "name": {"type": "string"},
      "age": {"type": "number"}
    },
    "required": ["name", "age"]
  };
  let isValid = data.validateSchema(schema); // returns true

Transforming Data

Transform data with the transform() method:

  let transformedData = data.transform((jsonData) => {
   jsonData.age += 1;
   return jsonData;
  });

App Example: User Information Manager

Let’s create a simple app to manage user information using the LiveJSON APIs:

  const liveJson = require('livejson');

  // Initialize JSON with user data
  let users = liveJson.init([
    { "name": "John", "age": 30, "city": "New York" },
    { "name": "Jane", "age": 25, "city": "San Francisco" }
  ]);

  // Add a new user
  users.add({
    "name": "Doe",
    "age": 22,
    "city": "Los Angeles"
  });

  // Update user age
  users.get(0).set('age', 31);

  // Remove a user
  users.remove(1);

  // Get all user names
  let userNames = users.map(user => user.get('name'));

  console.log(userNames); // Output: ['John', 'Doe']

With LiveJSON, managing and manipulating JSON data is intuitive and efficient, paving the way for smoother application development.

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