Nuxt Csurf

Cross-Site Request Forgery (CSRF) prevention.
Create a middleware for CSRF token creation and validation.

✅ Supports Node.js server & serverless environments
✅ Supports both universal and client-side rendering (ssr: true|false)
✅ TypeScript

Setup

yarn add @gotedo/nuxt-csurf # yarn
npm i @gotedo/nuxt-csurf # npm

Usage

The only thing you need to do to use the module in the default configuration is to register the module in the modules array in nuxt.config.ts:

// nuxt.config.js
{
  modules: [
    "nuxt-csurf",
  ],
  csurf: { // optional
    https: false, // default true if in production
    cookieKey: '', // "__Host-csrf" if https is true otherwise just "csrf"
    cookie: { // CookieSerializeOptions from unjs/cookie-es
      path: '/',
      httpOnly: true,
      sameSite: 'strict'
    },
    methodsToProtect: ['POST', 'PUT', 'PATCH'], // the request methods we want CSRF protection for
    excludedUrls: ['/nocsrf1', ['/nocsrf2/.*', 'i']], // any URLs we want to exclude from CSRF protection
    encryptSecret: /** a 32 bits secret */, // only for non serverless runtime, random bytes by default
    encryptAlgorithm: 'aes-256-cbc' // by default 'aes-256-cbc' (node), 'AES-CBC' (serverless)
    useFormToken: true; // Read CSRF token from JSON body or FormData object.
  }
}

useCsrfFetch

This composable provides a convenient wrapper around useFetch. It automatically adds the CSRF token in headers.

const { data, pending, error, refresh } = useCsrfFetch('/api/login', { query: param1: 'value1' })

$csrfFetch

This helper provides a convenient wrapper around $fetch. It automatically adds the CSRF token in headers.

const { $csrfFetch } = useNuxtApp()
const { data } = await $csrfFetch('/api/login', { method: 'POST', body: …, headers: … })

$csrf

The $csrf helper directly provides the active CSRF token so that you can use it anyhow you want within your component.

<template>
  <form
    id="my-form"
    @submit.prevent="testForm"
  >
    <input
      v-show="false"
      v-model="form['csrf-token']"
      name="csrf-token"
      type="text"
    />
    <button @click.prevent="testForm">Submit</button>
  </form>
</template>

<script setup lang="ts">
const { $csrf } = useNuxtApp();

const form = reactive({
  "csrf-token": "",
});

const formData = computed(() => {
  const formData = new FormData();
  formData.set("csrf-token", form["csrf-token"]);
  return formData;
});

onMounted(() => {
  form["csrf-token"] = $csrf || "";
});

const testForm = async function () {
  const data = await $fetch("/api/test", {
    method: "POST",
    credentials: "same-origin",
    body: formData.value,
  })
};
</script>

useCsrf

Use this composable if you need to access to the CSRF token value.

const { csrf } = useCsrf();
console.log(csrf); // something like: mo4+MrFaeXP7fhAie0o2qw==:tLUaqtHW6evx/coGQVAhtGAR+v6cxgFtrqmkOsuAMag8PHRnMwpbGGUO0TPJjL+4

Credits

• inspired by tiny-csrf and expressjs/csurf
• see OWASP CSRF cheatsheet