I’ll introduce the reserved words that Shopify uses as URL parameters and how to use namespaces when developing customizations.

Background: URL Parameter ?sid=1 Disappears on Shopify Sites

I received a consultation about URL parameter ?sid=1 disappearing when added to Shopify sites, so I investigated it.

Testing ?sid=1&__sid=2

I used one EC site made by Shopify from Ecommerce templates and online store template examples - Shopify for testing.

https://www.mollyjogger.com/?sid=1&_sid=2&__sid=3

When accessing this URL, sid=1 disappeared and was redirected to:

https://www.mollyjogger.com/?_sid=2&__sid=3

Others: _sid, q, variant, etc.

It would be nice if Shopify’s official documentation listed URL parameters, but there didn’t seem to be any.

From just my brief investigation, Shopify uses the following URL parameters:

_pos
_sid
_ss
q
variant

Solution: Use Namespace for Custom URL Parameters in Shopify

I think adding double underscores __ or adding a namespace would avoid conflicts with reserved words for URL parameters that Shopify uses.

That’s all from the Gemba about developing with consideration for URL parameters that Shopify uses.

Reference Information

• How to check session in Shopify - Stack Overflow