Saving and loading data from disk for persistence in a Discord.js bot

discord-js-data-persistence.js

const fs = require('fs');
const Discord = require('discord.js');
const client = new Discord.Client();

let saveData;
try {
    saveData = JSON.parse(fs.readFileSync('./save-data.json', 'utf8')); // Load save data
} catch(e) {
    saveData = { caseCount: 0 }; // Init if no save data found
}

client.on('ready', () => {
    // Client ready
});

client.on('message', message => {
    if(message.author.bot) return; // Ignore bots
    saveData.caseCount++; // Increment case count
    message.channel.send(`${saveData.caseCount}. Hello`); // Send message with case number
    fs.writeFileSync('./save-data.json', JSON.stringify(saveData)); // Save count to file
});

client.login('bot_token');