What file should I edit?

[Esely1945]

Hi,

New user here, I just installed Prestashop 8.2.0, I want to add simple javascript/jQuery code right before </body> ?

What file should I edit? or should I do it via backend?

Thank you.

[Prestashop Addict]

Hi, it depends if you use js CCC or not, and the theme used.

[Andrei H]

Hello,

PrestaShop automatically loads a custom.js file if it exists in the themes/<theme>/assets/js/ directory as you can see here

You just need to create the file and add your custom code in there. Then clear the browser cache and the changes should be visible.

[Caroline Harper]

On 1/7/2026 at 2:42 PM, Esely1945 said:

Hi,

New user here, I just installed Prestashop 8.2.0, I want to add simple javascript/jQuery code right before </body> ?

What file should I edit? or should I do it via backend?

Thank you.

Hi,

You generally should not edit core PrestaShop files to add JavaScript. The recommended way depends on how permanent and reusable your code is.

Recommended approach (safe and update-friendly)

Option 1: Use the theme footer template (simple scripts)
If you just need to add a small script before </body>:

Edit

/themes/your-theme/templates/_partials/footer.tpl

Add your JavaScript at the end of the file.

This is safe and won’t be overwritten by core updates (only theme changes).

Best practice (cleanest solution)

Option 2: Create a small custom module

Register your JS using hookHeader (position = bottom) or hookDisplayFooter

This keeps your changes upgrade-safe and independent of the theme

This is the preferred solution if the script is reusable or you plan to maintain it long-term.

What to avoid

❌ Editing core files in /classes, /controllers, or /themes/core

❌ Injecting JS directly into backend templates

Summary

Quick test or small script → footer.tpl

Long-term or reusable logic → custom module

If you want, I can share a step-by-step mini module example to inject JavaScript properly in PrestaShop 8.x.