JSON-Async-error.md

JSON-Async-error

Using Node.JS,read a JSON object?

https://www.npmjs.com/package/jsonfile

js code

// Read Asynchrously

// D:\NodeJs>node readAsync.js

// Define JSON File
var fs = require("fs");

console.log("***STARTING***\n");

//Get content from file
//ES 5
var contents = fs.readFile('dummy.json', 'utf8', function (err, data) {
    if (err) throw err;
    console.log("data =" + data);
});

//ES 6
/*var contents = fs.readFile('dummy.json', 'utf8', (err, data) => {
    if (err) throw err;
    console.log(data);
});*/

// Define to JSON type
var jsonContent = JSON.parse(contents);


// Get Value from JSON
console.log("User Name:", jsonContent.username);
console.log("Email:", jsonContent.email);
console.log("Password:", jsonContent.password);

console.log("\n***EXIT***");

json file

{
    "username": "xyz",
    "password": "xyz@123",
    "email": "[email protected]",
    "uid": 1100
}

???

The contents of the file is available only after the read is finished, so either use fs.readFileSync, which will return the content, or

fs.readFile('dummy.json', 'utf8', function (err, data) {
    if (err) throw err;
    console.log("data =" + data);
    // Define to JSON type
    var jsonContent = JSON.parse(data);


    // Get Value from JSON
    console.log("User Name:", jsonContent.username);
    console.log("Email:", jsonContent.email);
    console.log("Password:", jsonContent.password);

    console.log("\n***EXIT***");
});

https://github.com/jprichardson/node-jsonfile

https://github.com/xgqfrms-GitHub/json-server/