Sometimes the best way to store some data in a Node.js application is to save it to the filesystem.If you have an object that can be serialized to JSON, you can use the JSON.stringify() method and the fs method fs.writeFileSync() which synchronously writes a piece of data to a ...
A JavaScript object is a collection of key-value pairs known as properties. Objects are commonly used for storing, manipulating, and sending data over the network. There are 6 ways to create an object in JavaScript. You can use: Object Literal Object Constructor Constructor Function Object....
key, value ] = item; obj[key] = value; }returnobj; }constobj =autoConvertMapToObject(map)log(`\nobj`, obj);// obj { a: 1, b: 2, c: 3 } js Object to Map js 构造函数 初始化 Map // 二维数组constmodalMap =newMap([ ['image','img'], ['video','video'], ]); https:...
The rest operator will copy the properties of theobj1intoobj2. This is similar toObject.assign(), where we shallow copy the properties of the objects. To copy an object using the spread operator, you have to write the object name after the spread symbol. ...
stringify(user) // write JSON string to a file fs.writeFile('user.json', data, err => { if (err) { throw err } console.log('JSON data is saved.') }) To pretty-print the JSON object to the file, you can pass extra parameters to JSON.stringify():// pretty-print JSON object ...
To access the JSON object in JavaScript, parse it withJSON.parse(), and access it via “.” or “[]”. JavaScript <script>vardata ='{"name": "mkyong","age": 30,"address": {"streetAddress": "88 8nd Street","city": "New York"},"phoneNumber": [{"type": "home","number":...
Before diving into the conversion process, let’s briefly discuss what JSON is and why it’s essential. JSON, or JavaScript Object Notation, is a lightweight data interchange format that is easy for humans to read and write. It’s also easy for machines to parse and generate, which makes...
In programming, our first consideration is usually the machine — how the computer is reading and interpreting the code we write. However, it’s equally important to consider the people who will be reading and working with the code. Whether you’re working with a team or on your own, you...
Later, using template literal to construct a string with the form data, so that it can be converted into a BLOB object.let data = ` Name: ${name.value} Age: ${age.value} Email: ${email.value} Country: ${country.value} Message: ${msg.value}`; 📋...
Modern JavaScript has many new features that make it easy to write code in a simple and structured manner. One of the handy modern features available in ES6+ is array and object destructuring. JavaScript frameworks like React.js and Angular encourage the use of this technique. So it’s essent...