@fastify/cookie

Plugin for Fastify that adds support for reading and setting cookies, including signed cookies.

@fastify/cookie

Fastify

Plugin for Fastify that adds support for reading and setting cookies, including signed cookies.

npm GitHub Docs

Fit

Install size includes transitive dependencies. Bundle size is gzipped browser payload.

Freshness

The Problem

Fastify does not parse cookies out of the box, so reading session identifiers or preferences from Cookie headers and setting Set-Cookie responses requires manual header handling on every route.

What It Does

@fastify/cookie decorates requests with parsed cookies and replies with a setCookie/clearCookie API, and supports signed cookies for tamper detection. It integrates with Fastify's plugin and hook system.

Installation

bash

npm install @fastify/cookie

Usage Example

import Fastify from "fastify";
import cookie from "@fastify/cookie";

const app = Fastify();
app.register(cookie, { secret: process.env.COOKIE_SECRET });

app.get("/", (req, reply) => {
  const visits = Number(req.cookies.visits ?? 0) + 1;
  reply.setCookie("visits", String(visits), { path: "/" });
  reply.send({ visits });
});

app.listen({ port: 3000 });

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