In this quick post, you will learn how to convert JavaScript Object to JSON String and JSON object using the methods JSON.stringify() and JSON.parse().

Sometimes when you query a database and retreive a record, it might return you a JavaScript object. You might not know how to parse the values inside the object but if you print the object you might see all the values in it.

For example, I queried MongoDB using Mongoose findOne method. It returned an Object.

var user = await users.findOne({username: req.body.username});
console.log(user);

When you print the object, you can see all the values in it.

{
  _id: 5e16e8a3c3775d62f3acbe72,
  name: 'Sudarshan Thiru',
  username: 'sthiru',
  role: 'Logistics Head',
  group: [ 'Leaders' ]
}

But when you try to access a property inside the object, you won’t be able to.

console.log(user.role); //undefined

To convert this object to JSON object, you need to convert it to string first using JSON.stringify() and then parse it using JSON.parse().

 if(user) {
        user = JSON.stringify(user);
        user = JSON.parse(user);
   		console.log(user.role); //Logistics Head
 }
   		

Once the object is converted to JSON object, you can just access its properties using period (.) like user.role.