Bolt.new AI and ConvertKit integration: Step-by-Step Guide 2025

The direct way to integrate Bolt.new with ConvertKit is to treat ConvertKit exactly like any external REST API: you create API calls from your Bolt.new project using ConvertKit’s official REST endpoints, authenticate with your ConvertKit API key and API secret via environment variables, then wire those calls into whatever UI or workflow your app uses. Bolt.new does not have a special ConvertKit connector — but it fully supports calling ConvertKit’s API using fetch, Axios, or any HTTP client inside server-side routes.

 

What ConvertKit Provides

 

ConvertKit exposes a public REST API. You use it for actions such as:

• Creating or subscribing a user to a form or sequence
• Adding tags to a subscriber
• Fetching subscriber data

ConvertKit uses two authentication values:

• API Key (public-ish, used client or server)
• API Secret (server-only, keep hidden)

Bolt.new’s runtime allows safe environment variables, so you put the secret there.

 

What You Actually Do in Bolt.new

 

You create a backend route (for example in a Next.js or Express-style setup inside Bolt.new) that calls ConvertKit’s endpoints. Your frontend submits to your route. Your backend calls ConvertKit securely. That’s the whole integration.

Example: adding an email subscriber to a ConvertKit form.

 

Step-by-Step Integration

 

The flow below is the simplest real-world integration you can build today.

• Inside Bolt.new, open your project and add environment variables:
  CONVERTKIT_API_KEY=your_public_key
  CONVERTKIT_API_SECRET=your_secret_key
  CONVERTKIT_FORM_ID=the_form_id_you_want_to_subscribe\_to
• Create a server route that receives an email and posts it to ConvertKit.
• Call that server route from your frontend form or AI workflow.

 

// Example Next.js-style API route in Bolt.new
// File: app/api/subscribe/route.js

export async function POST(request) {
  try {
    const { email } = await request.json(); // email from frontend

    const apiKey = process.env.CONVERTKIT_API_KEY;
    const formId = process.env.CONVERTKIT_FORM_ID;

    // ConvertKit's official endpoint for subscribing someone to a form
    const url = `https://api.convertkit.com/v3/forms/${formId}/subscribe`;

    const res = await fetch(url, {
      method: "POST",
      headers: {
        "Content-Type": "application/json"
      },
      body: JSON.stringify({
        api_key: apiKey,     // ConvertKit requires api_key here
        email: email
      })
    });

    const data = await res.json();
    return Response.json({ ok: true, convertkit: data });
  } catch (e) {
    return Response.json({ ok: false, error: e.message }, { status: 500 });
  }
}

 

Wire Up a Frontend Form in Bolt.new

 

// Example React component for Bolt.new
// File: app/page.jsx

"use client";
import { useState } from "react";

export default function HomePage() {
  const [email, setEmail] = useState("");
  const [msg, setMsg] = useState("");

  async function submit(e) {
    e.preventDefault();
    const res = await fetch("/api/subscribe", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ email })
    });

    const data = await res.json();
    if (data.ok) setMsg("Subscribed!");
    else setMsg("Error: " + data.error);
  }

  return (
    <div>
      <form onSubmit={submit}>
        <input 
          value={email}
          onChange={(e) => setEmail(e.target.value)}
          placeholder="Your email"
        />
        <button type="submit">Subscribe</button>
      </form>
      <p>{msg}</p>
    </div>
  );
}

 

Webhook Support (Optional)

 

If you want ConvertKit to notify your Bolt.new app when subscribers confirm or change status, you can use ConvertKit’s webhooks. In ConvertKit dashboard you register a webhook URL such as:

https://your-bolt-url.app/api/convertkit/webhook

Then create a route that receives POSTs and handles them. Bolt.new supports this as long as your project is deployed with a public URL.

 

Important Notes

 

• Never expose your API Secret to the frontend. Keep it only in env vars.
• Use server routes to call ConvertKit. Client direct calls are unsafe.
• ConvertKit is a simple REST API — no SDK required.
• Bolt.new does not connect automatically. You are writing real API calls.

 

That’s the full real-world integration: environment variables for credentials, backend route to ConvertKit, frontend to your backend. This works in Bolt.new workspace and in any hardened production environment afterward.