How to make a command randomly fail - node.js

Question

Okay so on my bot I have a beg command but the peoblem is I want it to sometimes fail.
For example one time it might say "Someone gave you $5" but if it fails it would say "Famous Person: NOPE"
The code below chooses a random text from a file where all the text is.
Is there anyway to mke it randomly fail so a user does not get money?
const { RichEmbed } = require("discord.js");
const { stripIndents } = require("common-tags");
const { prefix } = require("../../botconfig.json");
const db = require('quick.db')
let bal = require("../../database/balance.json");
const fs = require('fs');
const cooldowns = new Map();
const humanizeDuration = require('humanize-duration');
//Set cooldown
module.exports = {
name: "beg",
aliases: [],
category: "economy",
description: "Gets you money",
usage: "[command | alias]",
run: async (client, message, args) => {
const cooldown = cooldowns.get(message.author.id);
if (cooldown) {
const remaining = humanizeDuration(cooldown - Date.now(),{ units: ['s'],round: true });
let cEmbed = new RichEmbed()
.setColor("RANDOM")
.setTitle("Slow down, cmon!")
.setDescription(`You dont want to be like a cry baby! You will be able to beg in \`${remaining}\` just you wait!\n\nWhile you wait why not follow our [Twitter](https://twitter.com/switchoffical)`)
return message.channel.send(cEmbed)
.catch(console.error);
} else {
if(!bal[message.author.id]){
bal[message.author.id] = {
balance: 0
};
}
const Jwork = require('../../beg.json');
const JworkR = Jwork[Math.floor(Math.random() * Jwork.length)];
var random = Math.floor(Math.random() * 20) + 3;
let curBal = bal[message.author.id].balance
bal[message.author.id].balance = curBal + random;
fs.writeFile('././database/balance.json', JSON.stringify(bal, null, 2), (err) => {
let embed = new RichEmbed()
.setColor("RANDOM")
.setDescription(`**\ ${message.author.username}**, ${JworkR} 💵 **${random}**`)
message.channel.send(embed)
if (err) console.log(err)
});
//Adds the user to the set so that they can't talk for a minute
cooldowns.set(message.author.id, Date.now() + 10000);
setTimeout(() => cooldowns.delete(message.author.id), 10000);
}
}
}
I just don't know how to make it fail

Answer 1

So what you can do is run a Math.floor((Math.random()-0.001)*4) store it to a variable. Now you have a random number from 0 to 3 (4 different numbers/outcomes). And then check whether your new variable equals 0. if(failChance === 0) if it's true just don't do the add bal cmd.
Example:
...
} else {
var failChance = Math.floor((Math.random()-0.001)*4);
if(failChance === 0){
message.channel.send('FAILURE');
return;
}
if(!bal[message.author.id]){
...