What is a query string

What is a query string – A query string is the part of a URL that contains extra information in the form of key-value pairs, usually starting after a question mark (?). It is used to pass data such as search terms, filters, or tracking parameters to a website or application.

How a Query String Works

• A query string begins after the ? in a URL.
• It consists of parameters (keys) and their values, separated by an equals sign (=).
• Multiple parameters are separated by an ampersand (&).
• Example:Codehttps://example.com/search?term=shoes&color=blue
  • term=shoes → search term
  • color=blue → filter applied

The server reads these values and customizes the response, such as showing filtered products or search results.

Common Uses of Query Strings

• Search queries: Passing keywords to search engines.
• Filters: Sorting products by price, color, or category.
• Tracking: Marketing campaigns use UTM parameters (e.g., utm_source=google).
• Preferences: Language or currency selection.
• Form submissions: Sending user input data to servers.

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Benefits of Query Strings

• Dynamic content delivery without changing the page structure.
• Easy tracking of user behavior and campaign performance.
• Flexible data transfer between pages without server-side storage.

Query String vs. Other URL Parts

Query String	Path
Starts after ?	Comes before ?
Contains parameters and values	Defines the location of the resource
Example: ?id=123&sort=asc	Example: /products/shoes

Examples

• Google Search: https://www.google.com/search?q=weather+Lucknow
  • q=weather+Lucknow passes the search term.
• E-commerce filter: https://store.com/products?category=electronics&price=low
  • Filters products by category and price.

FAQs : What is a query string