Bits of .NET

📄 JSON = Data Exchange

JSON is everywhere. JSON parsing and manipulation is essential for JavaScript developers.

📝 JSON Operations

// Parse JSON
const jsonString = '{"name":"John","age":30}';
const obj = JSON.parse(jsonString);

// Stringify JSON
const objData = { name: 'John', age: 30 };
const jsonData = JSON.stringify(objData);

// Pretty Print
console.log(JSON.stringify(objData, null, 2));

// Handle Errors
try {
    const data = JSON.parse(invalidJson);
} catch (error) {
    console.error('Invalid JSON:', error);
}

// Nested JSON
const data = {
    user: {
        name: 'John',
        address: {
            city: 'New York',
            country: 'USA'
        }
    }
};

// Access Nested Properties
const city = data.user.address.city;

🎯 Advanced JSON

// JSON with Dates
const withDate = {
    name: 'John',
    createdAt: new Date()
};
const json = JSON.stringify(withDate);
// Dates become strings

// Custom Serialization
const data = {
    name: 'John',
    toJSON() {
        return { name: this.name.toUpperCase() };
    }
};

// JSON Reviver
const jsonData = '{"name":"John","createdAt":"2024-01-15T10:00:00Z"}';
const parsed = JSON.parse(jsonData, (key, value) => {
    if (key === 'createdAt') {
        return new Date(value);
    }
    return value;
});

// Deep Clone
const original = { a: 1, b: { c: 2 } };
const cloned = JSON.parse(JSON.stringify(original));

// JSON Validation
function isValidJSON(str) {
    try {
        JSON.parse(str);
        return true;
    } catch {
        return false;
    }
}

// Merge JSON Objects
function mergeJSON(obj1, obj2) {
    return { ...obj1, ...obj2 };
}

💡 JSON Tips

• Always validate JSON
• Use try-catch for parsing
• Pretty print for debugging
• Handle nested data carefully
• Use JSON schema for validation