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I've implemented my website to be like
domain/objects?id=xxx
like
domain/objects?id=bikeId
What I am worrying is the way that search engines will react to it.
I've already implemented the meta tags so each item will have it's own name printed into the title and meta tags but will they show it as different pages?
Is it suggested to implement a custom routing so instead I have the id in the url?
domain/objects/xxx
like
domain/objects/bikeId
but will they show it as different pages?
Yes, they are different URLs, therefore (unless otherwise stated) they will be seen and indexed as different pages in the SERPs.
If you wanted search engines to see these as the same URL then you would need to explicitly declare the canonical URL in the HTML and/or explicitly instruct Google to ignore the URL parameter in Google Search Console.
Is it suggested to implement a custom routing...
You do not need to do that for search engines. That URL structure is primarily to benefit users, not search engines.
Read Google's article about duplicate URLs and duplicate pages: https://support.google.com/webmasters/answer/139066?hl=en
Also you can specify in Google Search Console which query params should be ignored.
If you cannot do both of it you can also exclude duplicate pages using robots.txt but I wouldn't recommend it
Disallow: /*?*id=
