Does store-bought salsa have an expiration date/shelf life after being opened? So I like salsa, but don’t eat enough of it to use it all in a few days. In general, does store bought salsa—that is stored in the supermarket on open shelves without temperature control—go bad even if refrigerated after opening?

I’ve personally used store bought salsa a few weeks after opening and it smelled fine and there was no sign of mold. Was this an error on my part because I’ve never gotten sick from that stuff; just want a more informed answer if possible.
Like all shelf stable foods, it's fully packed with preservatives... And how long it lasts after being opened, that generally depends on the processing and preservatives in the product.

Being on the safer side, I'd say, even after opening and kept sealed airtight, within 1-2 weeks you should be done with it. But I'm sure, the manufacturer has the right information, written somewhere on the jar...