How to store an array in a javascript file

Question

So I'm using discord.js and am trying to get a block command to store its value in an array. In other words, when I do /block It will ignore that person, but I want it to store it in a file so it stays after restarting. My current code is below:

//at the top
var { blockedUsers } = require('./blocked.json')

//in the command listener
if (command == 'block') {
    let user = message.mentions.users.first();
    if (user && !blockedUsers.includes(user.id)) blockedUsers.push(user.id);
    message.channel.send(`blocked!`)
}

blocked.json:

{
"blockedUsers": []
}

This works fine, but after restarting the bot, the blocked list clears. How can I get it to store it in the file so that it stays after restarting?

Using require, you get access to the JSON data, no the file. Try using fs library to write your JSON file. Check this post: stackoverflow.com/questions/36856232/… — Leandro Matilla
– Leandro Matilla, Commented Feb 18, 2021 at 19:58

Guerric P · Accepted Answer · 2021-02-18 20:04:53Z

1

By using require on a JSON file, you are evaluating the file content as a JavaScript object, which lives independently of the JSON source file.

For persisting the modifications in the file, use this:

const fs = require('fs');

fs.writeFile("./blocked.json", JSON.stringify({ blockedUsers }), function(err) {
    if(err) {
        return console.log(err);
    }
    console.log("The file was saved!");
});

answered Feb 18, 2021 at 20:04

Guerric P

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