Is javascript possible with Checkout extensibility?

Topic summary

Feasibility of adding custom JavaScript to Shopify’s checkout after the Checkout Extensibility upgrade. The original poster cites Shopify’s documentation and asks if basic JS can be inserted via the new drag-and-drop editor (sections/blocks) without building/hosting an app.

One reply claims it’s possible on Shopify Plus and provides a screenshot, but no implementation details are shared. The poster clarifies they need simple JS functions and want to avoid creating a full app.

Subsequent participants ask for updates or a method. The original poster later states there doesn’t appear to be a solution yet.

Key points:

  • Desire: add basic JS in the new checkout without an app.
  • Claim: possible on Shopify Plus (undocumented in the thread).
  • Constraint: no confirmed path to inject JS directly via sections/blocks.

Status: Unresolved. No concrete workaround or official method is confirmed in the discussion; multiple users continue seeking a non-app solution.

Summarized with AI on January 9. AI used: gpt-5.

I’ve just be reading up about the checkout extensibility upgrade and it looks like it will be impossible to add javascript to the checkout post-upgrade:

https://help.shopify.com/en/manual/checkout-settings/checkout-extensibility/checkout-upgrade

Will there be the ability to add custom javascript in a section/block with the new drag and drop editor (previewed in the latest Editions (Winter))?

It seems major overkill to build and host and app for a couple of basic javascript functions (which is all that most of our Plus stores require).

2 Likes

@timd

Yes, it’s possible if you have Shopify plus store attaching a screenshot for reference.

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@gr_trading sorry if the original post was unclear but I’m wanting to be able to add basic javascript function without having to host an entire app.

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Hi, @timd did you find any way to add javascript using Shopify checkout extensibility?

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It doesn’t look like theres a solution for this yet.

2 Likes

Hey Timd, any updates? Did you managed to sort this in maybe another way?

1 Like

Did you find a solution for adding Javascript to the new checkout? I’m having the exact same issue. Thanks

1 Like