What is a Query String?
The term query string refers to the part of a URL where data is passed to a web application or backend database. A query string begins after the question mark ("?") and consists of key-value pairs separated by equals signs ("="), while multiple parameters are separated by ampersands ("&"). For example:
www.domainexample.com/product-category/products?sort=asc&price=desc
Here, "sort=asc&price=desc" is the query string, which passes information about sorting and price filtering to the server.
What are query strings used for?
Query strings are primarily used to pass information to the server in order to retrieve dynamic content on a website. For example, they are frequently used on category pages where users can filter and sort products. When a user applies a sort or filter, parameters are added to the URL as a query string, enabling the server to deliver the specific content.
Modern usage and security
- Security aspects: Query strings can contain sensitive data that is visible in the browser's address bar and may be logged on servers. It is therefore important to avoid passing sensitive information such as passwords or personal data in query strings. To protect data from misuse, it is recommended to use encryption or avoid query strings for security-related information, and to sanitise data to guard against injection attacks
- SEO and query strings: Incorrect use of query strings can lead to SEO issues such as duplicate content. Search engines may index multiple versions of the same page with different query strings, which can harm the website's visibility. To avoid this, you should use canonical tags or other SEO tools that help consolidate URLs and prevent duplicate indexing.
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