Exploring JSON data and making precise adjustments in JavaScript

Question

Exploring JSON data and making precise adjustments in JavaScript

I am attempting to create my own database using JavaScript and JSON, but I have encountered some issues along the way.

My main struggle is figuring out how to extract specific content from a JSON file. After doing some research, I came across this code snippet:

fs.readFile('./databases/' + dbName + ".json", (err, data) => {
     if (err) throw err;
     content = JSON.parse(data);
     console.log(content)
});

However, when I run this code, I only receive the entire list of members in the output:

{
  members: [
    { Username: 'User-1', Password: 'lol' },
    { Username: 'User-2', Password: 'lol' }
  ]
}

Process finished with exit code 0

Instead, what I really need is to access specific information like just the password of "User-1" from the JSON file:

{
  "members": [
    {
      "Username": "User-1",
      "Password": "lol"
    },
    {
      "Username": "User-2",
      "Password": "lol"
    }
    ]
}

(I am determined to stick to using JSON files for this project)

Any assistance on this issue would be greatly appreciated :)

javascript node.js json database fs

Answer 1

Answer №1

Your inquiry lacks sufficient information


fs.readFile("./databases/" + dbName + ".json", (err, data) => {
  if (err) throw err;
  var username = "User-1";
  var password = "lol";

  for (var i = 0; i < content.members.length; i++) {
    if (
      content.members[i].Username == username &&
      content.members[i].Password == password
    ) {
      console.log("Login Successful");
      return true;
    }
  }
  console.log("Login Failed");
  return false;
});

Collect the username and password inputs from the user interface and utilize a for loop to verify if the credentials match any entries in the json database file

Answer 2

Your inquiry lacks sufficient information


fs.readFile("./databases/" + dbName + ".json", (err, data) => {
  if (err) throw err;
  var username = "User-1";
  var password = "lol";

  for (var i = 0; i < content.members.length; i++) {
    if (
      content.members[i].Username == username &&
      content.members[i].Password == password
    ) {
      console.log("Login Successful");
      return true;
    }
  }
  console.log("Login Failed");
  return false;
});

Collect the username and password inputs from the user interface and utilize a for loop to verify if the credentials match any entries in the json database file

Answer 3

Answer №2

If you're considering storing data in a format similar to JSON, there are already databases available that provide excellent storage solutions such as MongoDB or Firebase.

In relation to your specific issue, the code is functioning correctly; what you need is a filter.

fs.readFile('./databases/' + dbName + ".json", (err, data) => {
    if (err) throw err;

    const username = username;
    const password = password;

    //const username = "User-2";
    //const password = "lol";

    content = JSON.parse(data);
    console.log(content.members.filter(mem => { if (mem.Username === username && mem.Password === password) return mem} ));
});

This will result in:

[ { Username: 'User-2', Password: 'lol' } ]

You'll need to incorporate a method for accepting the username and password, or any other filtering parameters you may consider.

Answer 4

If you're considering storing data in a format similar to JSON, there are already databases available that provide excellent storage solutions such as MongoDB or Firebase.

In relation to your specific issue, the code is functioning correctly; what you need is a filter.

fs.readFile('./databases/' + dbName + ".json", (err, data) => {
    if (err) throw err;

    const username = username;
    const password = password;

    //const username = "User-2";
    //const password = "lol";

    content = JSON.parse(data);
    console.log(content.members.filter(mem => { if (mem.Username === username && mem.Password === password) return mem} ));
});

This will result in:

[ { Username: 'User-2', Password: 'lol' } ]

You'll need to incorporate a method for accepting the username and password, or any other filtering parameters you may consider.

Exploring JSON data and making precise adjustments in JavaScript

Answer №1

Answer №2

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