exports.run = (client, message, args) => { if (message.author.id == "267065637183029248") { // Gets the prefix from the command (eg. "!prefix +" it will take the "+" from it) let newPrefix = message.content.split(" ").slice(1, 2)[0]; // change the configuration in memory config.prefix = newPrefix; // Now we have to save the file. fs.writeFile("./config.json", JSON.stringify(config), (err) => console.error); } }