How to check if value already exists in javascript JSON array?

Question

var ComfyJS = require("comfy.js");
var fs = require('fs');

const dataBuffer = fs.readFileSync('database.json');
const dataJSON = dataBuffer.toString();
const scoreBoard = JSON.parse(dataJSON);

ComfyJS.onChat = (user, message, flags, self, extra) => {
      for (let i = 0; i < scoreBoard.length; i++) {
      if (scoreBoard[i].name == user) {
        console.log('The name already exist');
      }
      else{
        scoreBoard.push({name:user,score:message});
      }
    }

    var data = JSON.stringify(scoreBoard);

    fs.writeFile('database.json', data, function (err) {
      if (err) {
        console.log('There has been an error saving your configuration data.');
        console.log(err.message);
        return;
      }
      console.log('Configuration saved successfully.')
    });
}

Hi I'm new to code and I'd like to build a twitch bot and I want to save my data on a JSON file. ComfyJS.onchat triggers when somebody types something on chat and I want to take their name and message(score) as value and save it on my database but I need to save them one by one so if the name already exists in JSON file I don't want to add it. How should I fix it?

Answer 1

ComfyJS.onChat = (user, message, flags, self, extra) => {
  const exists = scoreBoard.find(fn => fn.name === user)
  if (exists) return;
  scoreBoard.push({
    name: user,
    score: message
  });

  var data = JSON.stringify(scoreBoard);

  fs.writeFile('database.json', data, function(err) {
    if (err) {
      console.log('There has been an error saving your configuration data.');
      console.log(err.message);
      return;
    }
    console.log('Configuration saved successfully.')
  });
}