Table of contents
Definition
A query parameter is the part of a URL that carries information and relays it back to the server [→].
Use Cases and Examples
URLs can relay information using different formats.
The query parameter structure is one of them. There is also the path parameter [→].
A query parameter takes to format: domainname.com?queryKey=queryValue.
?queryKey=queryValue is the part known as the query parameter.
Here is a more concrete example example.com?search=john.
In this last example, the server will receive the value john under the key search.
In this example, upon receiving the query parameter and its value it will perform a search and return the results to the user.
Summary
Query parameters are one of the oldest ways to pass data back to the server and it's still used by a lot of web services out there.
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