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JavaScript: Write a JSON object to a file

JavaScript fundamental (ES6 Syntax): Exercise-251 with Solution

Write a JavaScript program to write a JSON object to a file.

  • Use fs.writeFileSync(), template literals and JSON.stringify() to write a json object to a .json file.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const fs = require('fs');
const JSONToFile = (obj, filename) =>
  fs.writeFile(`${filename}.json`, JSON.stringify(obj, null, 2));
JSONToFile({ test: 'is passed' }, 'testJsonFile'); // writes the object to 'testJsonFile.json'

Flowchart:

flowchart: Write a JSON object to a file.

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Previous: Write a JavaScript program to create an element from a string (without appending it to the document).
Next: Write a JavaScript program to convert the values of RGB components to a color code.

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JavaScript: Tips of the Day

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring));

includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found: 

var string = "foo";
var substring = "oo";

console.log(string.indexOf(substring) !== -1);

Ref: https://bit.ly/3fFFgZv