formpost.js

import * as http from 'http';
import { WebflowClient } from "webflow-api";

const WEBHOOK_TOKEN = process.env.WEBHOOK_TOKEN;
const webflowClient = new WebflowClient();

async function handler(req, res) {

	if(req.method === 'POST') {
        
		let body = '';
		req.on('data', chunk => {
			body += chunk.toString();
		});

		req.on('end', async () => {

            const isValidRequest = await webflowClient.webhooks.verifySignature({
                headers: req.headers,
                body: body,
                secret: WEBHOOK_TOKEN,
            });

            if(!isValidRequest) {
                res.writeHead(500, 'Invalid signature');
                res.end();
                return;
            }

            body = JSON.parse(body);

            // Uncomment to see the whole body
            //console.log('BODY:\n', JSON.stringify(body, null, '\t'));

            const formDetails = {
                fromName: body.payload.data.Name,
                fromEmail: body.payload.data.Email,
                comments: body.payload.data.Comments
            }

            /*
            Imaginary routing system:

            based on comment text, go to one of three email addresses
            */

            let contactEmail = 'generic@webflow.com';

            if(formDetails.comments.toLowerCase().indexOf('cat') >= 0) {
                contactEmail = 'cat_support@webflow.com';
            } else if(formDetails.comments.toLowerCase().indexOf('dog') >= 0) {
                contactEmail = 'dog_support@webflow.com';
            }

            console.log(`Info on this form submission will be sent to: ${contactEmail}`);

			res.writeHead(204);
			res.end();

		});

	}

}

const server = http.createServer(handler);
server.listen(3000);
console.log('Listening on port 3000');