Discord JS Message Leveling System - discord.js

Question

I'm making a level system for my discord bot, I want it so if I reach level 5, it will give me a role. I want it to be so when you reach a certain level you will be given a role.
I pasted the code for the message leveling system I am using.
bot.on("message", async message => {
let xpAdd = Math.floor(Math.random() * 7) + 8;
if(!xp[message.author.id]) {
xp[message.author.id] = {
xp: 0,
level: 1
}
}
if(xp[message.author.id].level[5]) //idk if im doing this right, I want it so if level reaches a certain number, it will give out a role
{
console.log("skrt");
}
let curxp = xp[message.author.id].xp;
let curlvl = xp[message.author.id].level;
let nxtlvl = xp[message.author.id].level * 300;
let rankuplvl = xp[message.author.id].xp * 7;
xp[message.author.id].xp = curxp + xpAdd;
if(nxtlvl <= xp[message.author.id].xp) {
xp[message.author.id].level = curlvl + 1;
const lvlUp = new Discord.RichEmbed()
.setTitle("You leveled up!")
.setColor("#FFC0CB")
.addField("NEW LEVEL", curlvl + 1);
message.channel.send(lvlUp);
}
fs.writeFile("./xp.json", JSON.stringify(xp), (err) => {
if(err) console.log(error)
});
if(message.content.startsWith(prefix + "level")) {
message.channel.bulkDelete(1)
if(!xp[message.author.id]){
xp[message.author.id] = {
xp: 0,
level: 1
};
}
let curxp = xp[message.author.id].xp;
let curlvl = xp[message.author.id].level;
let nxtlvl = curlvl * 300;
let difference = nxtlvl - curxp;
const lvlEmbed = new Discord.RichEmbed()
.setAuthor(message.author.username)
.setColor("#FFC0CB")
.addField("XP", curxp, true)
.addField("Level", curlvl, true)
.setFooter(`${difference} XP until next rank!`, message.author.displayAvatarURL);
message.channel.send(lvlEmbed)
}
});

Answer 1

Let's break down what we need to do in order to reach your desired behavior. Assuming you're using the stable branch (most likely)...
Check if the user's level is 5.
Equality operator
Retrieve the desired role.
Guild.roles
By ID: Map.get() or use the ID as the RoleResolvable in #3.
By property: Collection.find()
Add a role to the user.
GuildMember.addRole()
Now, let's put it all together and implement it into your code.
if(nxtlvl <= xp[message.author.id].xp) {
xp[message.author.id].level = curlvl + 1;
// Check if the user's level is 5.
if (xp[message.author.id].level === 5) {
// Retrieve the desired role. Uncomment whichever line you need, as described.
// const role = message.guild.roles.get('idHere');
// const role = message.guild.roles.find(role => role.name === 'Level 5');
message.member.addRole(role) // Or simply use the role ID directly.
.catch(console.error); // Make sure to catch any rejected promises.
}
// Continue with your level-up embed.
}