A long URL can hide useful details in plain sight. Its hostname, port, path and query string describe different parts of the request. Reading them separately helps explain a broken link or an unexpected tracking parameter.
URL Component Inspector inspects an HTTP or HTTPS URL without fetching it. The tool does not make a network request to the address you enter.
Read the host separately from the path
For https://example.com/shop?city=Lahore&city=Karachi, the host is example.com and the path is /shop. The query contains two city pairs, in order. Neither value is silently discarded just because its name is repeated.
Repeated parameters can be intentional. Some applications accept several filters under one name. Others choose only one value. The parser shows the pairs; it cannot decide how the destination application will interpret them.
A fragment after a # is another component. It is not automatically the same thing as a query parameter. Keep that distinction when diagnosing a copied link.
Parsing is not a reputation check
A neatly parsed host can still lead to an unsafe website. This tool does not check ownership, certificates, malware or whether a business is genuine.
URLs with embedded credentials are rejected. Do not include a username and password in a link just to make it parse. Non web schemes are outside this tool's scope, including local file paths.
If an address fails, check whether it includes a complete HTTP or HTTPS scheme and whether copied whitespace or punctuation has been added at the edges.
Use the output to understand what your application is being asked to request. When comparing two links, examine the hostname first, then the path and individual query pairs. Similar looking visible text is not enough to establish that the addresses target the same resource.