How I Stopped Customers from Typing Their Email Wrong at Checkout

I run a training site that uses GoHighLevel for checkout and a WordPress-based LMS for course delivery. The checkout works great. The courses work great. There's just one problem.

Customers keep typing their email address wrong.

Not in a way that breaks the form. Gmail.com passes validation just fine. So does gmail.como, gmail.con, yaho.com, and about fifty other variations I've seen in my support inbox.

The customer completes the purchase. GHL sends the receipt to an address that doesn't exist. They never get their login credentials. They email support angry, or worse, they file a chargeback.

This was happening often enough that I finally decided to fix it at the source.

The Problem

GoHighLevel's checkout forms use a standard text input for the email field. There's no built-in typo detection. If someone types [email protected] and it passes basic @ and . checks, it goes through.

The tricky part is that you can't just add server-side validation here. GHL owns the checkout page. You don't control the backend. The form submits to GHL's servers, and by the time it processes, the bad email is already in the system.

So the fix has to happen client-side, before the form submits.

The Approach

I needed something that would:

1. Detect common domain misspellings in real time
2. Suggest the correct domain when a typo is likely
3. Let the customer accept the suggestion with one click
4. Never block the form from submitting (I'm not in the business of preventing sales)

There are JavaScript libraries for this. Email Spell Checker is one of the more popular ones. It checks the domain part of the email against a dictionary of common domains and suggests corrections.

The key design decision: make it a suggestion, not a block. Show a small message below the field. The customer can click "Yes, fix it" or ignore it entirely.

Building It

Here's the core of what I ended up with. I'll walk through the pieces.

First, include the library. I hosted it on Cloudflare Pages so I could update it in one place and have every checkout page pull the latest version:

<script src="https://your-domain.com/email-fix.js"></script>

The script itself does the following:

1. Find the email field. GHL checkout forms use input[name="email"]. The script waits for the DOM to load, finds that input, and attaches listeners.

2. Listen for changes. Two events: blur (when the customer tabs or clicks away) and input (as they type). Blur triggers the suggestion. Input clears it if they start typing again.

3. Run the spell check. When the customer leaves the email field, the script extracts the domain, runs it through the correction library, and checks if there's a likely typo.

4. Show the suggestion. If a typo is detected, a small message appears below the field: "Did you mean [email protected]?" with a clickable fix button.

5. Apply the fix. Clicking the button replaces the email field value with the corrected version. Clicking anywhere else dismisses the suggestion.

That's it. No form hijacking. No blocked submissions. No risk of breaking the checkout flow.

Cache Busting

One issue I ran into: Cloudflare Pages caches aggressively. If I pushed an update to the script, existing visitors might keep getting the old cached version.

The simplest fix was to set a short cache duration using a _headers file in the public directory:

/email-fix.js
  Cache-Control: public, max-age=300

Five minutes. Short enough that updates propagate quickly. Long enough that it's not hammering the server on every page load.

What About Real-Time Validation?

I considered showing the suggestion as the customer types, but that gets annoying fast. If someone is mid-word and a correction message pops up, it feels intrusive. The blur event is the right trigger. They've finished typing their email. They've moved on. Now you gently say, "Hey, double-check this."

If they start editing the field again, the suggestion disappears immediately. No friction.

The Results

After deploying this to my checkout pages, the typo-related support tickets dropped to near zero. Customers who would have been locked out of their course now get the right email on the first try.

It's not a complex solution. It's about 50 lines of JavaScript. But it solves a real problem that costs real money in chargebacks and support time.

Why This Matters for Course Creators

If you're selling courses through GoHighLevel, ClickFunnels, or any platform where you don't control the form backend, email typos are silently eating into your revenue. You just don't see it because the sale goes through. The customer thinks they got scammed. You think your delivery is working.

The email address is the linchpin of your entire delivery system. It's how they get login credentials, course access, receipts, and follow-up sequences. When that email is wrong, the whole chain breaks. And the customer blames you, not their own typing.

A simple client-side check on the checkout form can prevent most of these issues. You don't need to be a developer to set it up. The script runs on page load. You paste one line into your funnel settings. Done.

The broader lesson: look at your funnel from the customer's perspective, not yours. You might find other small friction points that are costing you customers. A form field that's confusing. A checkout page that takes too many steps. A confirmation email that lands in spam. These aren't glamorous problems to solve, but they're the ones that quietly eat into your revenue.

The takeaway: if there's a small friction point between your customer and their success, fix it before it becomes a support ticket. Your future self will thank you.

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If you're running into checkout issues or want to talk about building a smoother course delivery system, book a call.