CSRF with fastify session cookies - node.js

Question

I have a fastify session plugin that creates user sessions and manages them in postgres, but i want to make sure that i have all my sessions protected from CSRF. Im looking at the fastify-csrf plugin and im not exactly sure how to properly implement this. Do i need to generate the csrf token only when the session cookie is first generated or on all requests?
session plugin:
const cookie = require('fastify-cookie');
const session = require('fastify-session');
const csrf = require('fastify-csrf');
const pgSession = require('connect-pg-simple')(session);
const fp = require('fastify-plugin');
/**
* #param {import('fastify').FastifyInstance} fastify
*/
const plugin = async (fastify) => {
// All plugin data here is global to fastify.
fastify.register(cookie);
fastify.register(csrf, { sessionPlugin: 'fastify-session' });
fastify.register(session, {
store: new pgSession({
conString: process.env.DATABASE_URL,
tableName: 'user_session', // Defaults to 'session'
}),
secret: process.env.SESSION_SECRET,
saveUninitialized: false,
cookie: {
httpOnly: true,
secure: process.env.NODE_ENV !== 'development',
maxAge: 86400 * 1000, // 1 day expiration time
},
});
<!-- This is from the documentation, should this only be applied to the /login route when the cookie is generated? When do i verify that the cookie has not been tampered with?
fastify.route({
method: 'GET',
path: '/',
handler: async (req, reply) => {
const token = await reply.generateCsrf();
return { token };
},
});
// Add the user object to the session for later use.
fastify.addHook('preHandler', (req, reply, next) => {
if (!req.session) req.session.user = {};
next();
});
};
module.exports = fp(plugin);