Updated 2026-06-01
Add a newsletter signup to your stack
emcognito guides show how to add double-opt-in newsletter signup to Astro, Next.js, SvelteKit, and other static or serverless frontends. Each guide uses one publishable key, browser-safe requests, and portable subscriber data so developers can collect confirmed signups without building a custom backend first.
Add a newsletter signup to your Astro site
Drop one Astro component into any page to collect double-opt-in newsletter subscribers and lead metadata — no backend, no build plugin, no ESP.
Read the guide →Next.jsAdd a newsletter signup to your Next.js app
A single client component collects double-opt-in subscribers and lead metadata in any Next.js app (App Router or Pages) — and you read the list back from your server with a secret key.
Read the guide →SvelteKitAdd a newsletter signup to your SvelteKit site
One Svelte component collects double-opt-in subscribers and lead metadata on any SvelteKit page, static or server-rendered — pipe new confirmations into your stack with a signed webhook.
Read the guide →Using something else? The integration guide has copy-paste examples for Vanilla JS, React, Vue, Nuxt, Angular, and more — plus lead metadata, the server-side API, and webhooks.
References: MDN Fetch API, HTML forms standard.