JSON

What is JSON

JSON stands for JavaScript Object Notation

JSON is a text format for storing and transporting data

JSON is "self-describing" and easy to understand

JavaScript Object Notation (JSON) is a standard text-based format for representing structured data based on JavaScript object syntax. It is commonly used for transmitting data in web applications (e.g., sending some data from the server to the client, so it can be displayed on a web page)

JSON Example

'{"name":"John", "age":30, "money": 5000}'

How to access the data from JSON?

Let's see the example ...

• In the Visual Studio Code, create an data.json file

   

  

• copy this code to your data.json file

   

  {
    "users": [
      {
        "id": 1,
        "firstname": "Alice",
        "balance": 1000,
        "credit_ID": 2
      },
      {
        "id": 2,
        "firstname": "Bob",
        "balance": 500,
        "credit_ID": 1
      },
      {
        "id": 3,
        "firstname": "Charlie",
        "balance": 1500,
        "credit_ID": 4
      },
      {
        "id": 4,
        "firstname": "David",
        "balance": 2000,
        "credit_ID": 3
      }
    ],
    "banks": [
      {
        "id": 1,
        "owner": 1,
        "sender": "Alice",
        "receiver": 2,
        "note": "For lunch",
        "amount": 200,
        "bank": "Bank A",
        "type": "transfer"
      },
      {
        "id": 2,
        "owner": 2,
        "sender": "Bob",
        "receiver": 1,
        "note": "Repayment",
        "amount": 100,
        "bank": "Bank B",
        "type": "transfer"
      },
      {
        "id": 3,
        "owner": 3,
        "sender": "Charlie",
        "receiver": 4,
        "note": "Gift",
        "amount": 500,
        "bank": "Bank C",
        "type": "transfer"
      },
      {
        "id": 4,
        "owner": 1,
        "sender": "Alice",
        "receiver": 3,
        "note": "For lunch",
        "amount": 500,
        "bank": "Bank A",
        "type": "transfer"
      }
    ]
  }
  

  
  

   

• Create index.js file 

const data = require("./data.json");

console.log(data.banks[0]);

•  Query in JSON File

  const data = require("./data.json");
  data.users.forEach((e) => {
    if (e.firstname == "Bob") {
      console.log(e);
    }
  });

  or
  

  const data = require("./data.json");
  console.log(data.users.find((user) => user.firstname === "Bob"));

  

--- End of the example ---