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

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How to integrate Bolt.new AI with Plaid?

To integrate Plaid with a project you build inside Bolt.new, you don’t “connect Bolt to Plaid.” Instead, you write a normal backend server (Node, Python, etc.) inside the Bolt.new workspace and use Plaid’s real REST API or official SDK. Bolt.new is simply the environment where you write, scaffold, and run the code. The integration works exactly the same as in any real app: you load Plaid API keys as environment variables, call Plaid’s sandbox or production endpoints, handle OAuth if needed, and exchange Plaid’s link_token and public_token with your frontend. Nothing special or magical — just standard Plaid auth and API calls.

The Overall Idea

You build a backend in Bolt.new, install the official Plaid SDK, set environment variables (PLAID_CLIENT_ID, PLAID_SECRET), expose endpoints (like /create-link-token and /exchange-public-token), then call them from your frontend. Plaid Link renders in the browser, the user connects their bank, Plaid sends a public_token, your server exchanges it for an access\_token (stored securely — never on the frontend), and then you can request account, transaction, or balance data.

Bolt.new runs your Node server and React/HTML frontend.
Plaid provides banking connections via API + Plaid Link.
You wire them together using standard API auth flows.

Step-by-Step: Integrating Plaid in Bolt.new

Below is the safest, simplest, and 100% real workflow that works exactly the same outside Bolt.new.

Setup backend folder (inside Bolt.new workspace). Use Node.js because Plaid’s Node SDK is simple and official.
Install Plaid SDK

npm install plaid

Create your environment variables inside Bolt.new (.env file).

PLAID_CLIENT_ID=your_client_id
PLAID_SECRET=your_sandbox_or_dev_secret
PLAID_ENV=sandbox

Create your backend server — example using Express.

// server.js
import express from "express"
import { Configuration, PlaidApi, PlaidEnvironments } from "plaid"
import dotenv from "dotenv"

dotenv.config()

const app = express()
app.use(express.json())

// Configure Plaid client
const config = new Configuration({
  basePath: PlaidEnvironments[process.env.PLAID_ENV],
  baseOptions: {
    headers: {
      "PLAID-CLIENT-ID": process.env.PLAID_CLIENT_ID,
      "PLAID-SECRET": process.env.PLAID_SECRET
    }
  }
})

const client = new PlaidApi(config)

// Endpoint to create the link_token
app.post("/create-link-token", async (req, res) => {
  try {
    const response = await client.linkTokenCreate({
      user: { client_user_id: "user-id-123" }, // demo user ID
      client_name: "My Bolt App",
      products: ["transactions"],
      language: "en",
      country_codes: ["US"]
    })

    res.json({ link_token: response.data.link_token })
  } catch (err) {
    console.error(err)
    res.status(500).send("Error creating link token")
  }
})

// Exchange public_token for access_token
app.post("/exchange-public-token", async (req, res) => {
  try {
    const { public_token } = req.body

    const response = await client.itemPublicTokenExchange({
      public_token
    })

    const access_token = response.data.access_token // store securely!
    res.json({ access_token })
  } catch (err) {
    console.error(err)
    res.status(500).send("Error exchanging public token")
  }
})

app.listen(3000, () => console.log("Server running on 3000"))

Create a simple frontend inside Bolt.new to load Plaid Link.

<!-- index.html -->
<!DOCTYPE html>
<html>
<body>
  <button id="link-btn">Connect Bank</button>

  <script src="https://cdn.plaid.com/link/v2/stable/link-initialize.js"></script>
  <script>
    async function createLinkToken() {
      const res = await fetch("/create-link-token", { method: "POST" })
      const data = await res.json()
      return data.link_token
    }

    document.getElementById("link-btn").onclick = async () => {
      const linkToken = await createLinkToken()

      const handler = Plaid.create({
        token: linkToken,
        onSuccess: async (public_token) => {
          await fetch("/exchange-public-token", {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({ public_token })
          })
        }
      })

      handler.open()
    }
  </script>
</body>
</html>

Important Notes When Doing This Inside Bolt.new

Bolt.new sandbox servers can store .env variables safely while prototyping. In production, use a real secrets manager.
You cannot store access\_tokens in frontend — keep them server‑side only.
Plaid requires HTTPS for production; Bolt.new local preview is okay for sandbox.
You must use Plaid's Sandbox mode first — it's free and perfect for Bolt.new testing.

What You End Up With

A fully functional Plaid integration running entirely inside Bolt.new:

Backend with secure Plaid API calls
Frontend that opens Plaid Link
Public token → access token exchange
Ready to fetch real account + transaction data

This is exactly how real production Plaid apps work. Bolt.new is just the workspace where you build it.

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