Marketo Form Conflict Across Pages in Next.js (Forms Persist in Memory and Override Each Other)

[VijayTa]

Hi everyone 👋

I’m running into a persistent issue while integrating Marketo Forms inside a Next.js (React) application for Seismic’s website.

The issue:
When navigating between two pages that both contain Marketo forms — for example:

• https://www.seismic.com/resources/reports/g2-grid-spring-2025/

• The “Connect With Us” button will take you to get a demo (also a Marketo form)

— the Marketo forms conflict with each other.

Once a user visits one page and then navigates to another (SPA routing, not full reload), the Marketo form from the first page persists in memory (window.MktoForms2 cache). This leads to:

• Duplicate or multiple form instances (window.MktoForms2.allForms() keeps old forms)

• Conflicting success handlers — one form overrides another

• Stale or broken styling when switching between form types (inline vs popup)

• Programmatic reloads (router.reload() or window.location.reload()) causing further side effects like state loss and flickering

I’ve already tried:

• Clearing window.MktoForms2.allForms() and calling destroy() on each form

• Deleting window.MktoForms2 and reloading the script

• Using dynamic imports and script loaders

• Reloading the page programmatically on route changes

…but none of these provided a stable solution inside a single-page app context.

What I’m Looking For

Has anyone successfully isolated or reset Marketo Forms between routes in a React or Next.js application without a full page reload?
Would implementing a middleware or hook (to manage Marketo’s global state between page transitions) be a better long-term fix?

Any code patterns, examples, or best practices to handle this cleanly would be super helpful. 🙏

Environment details:

• Framework: Next.js 14+

• Integration: Marketo Forms 2.0 (MktoForms2 global script)

• Pages involved: Both use different Marketo form IDs

• Observed in Chrome and Edge

Thanks in advance to anyone who’s handled this kind of Marketo/SPA integration before!

[EstebanBustamante · Accepted solution]

Hi,

I think this issue has the same root cause as yours. Try the solution suggested here:
https://nation.marketo.com/t5/product-discussions/marketo-forms-in-single-page-applications-incorrec...

In theory, reloading the script after flushing the window.MktoForms2 object should work. What issues are you running into with that approach?

Hope this helps

[VijayTa]

Hi @EstebanBustamante,
Thank you so much, It resolved most of the issues i had with Forms2.

In theory, reloading the script after flushing the window.MktoForms2 object should work. What issues are you running into with that approach?

---

Of course, I have this one side effect which happens when ever I come back to the original page.
Form completely disappears due to flushing out the existing script ( Including cache ) But I will figure it out.

Thank you so much @EstebanBustamante.

This really help me alot.