What is the difference between GET, POST, PUT, DELETE in REST APIs?
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The four most commonly used HTTP methods in REST APIs—GET, POST, PUT, and DELETE—each serve distinct purposes, collectively covering the core CRUD (Create, Read, Update, Delete) operations essential for web development.
GET
GET is used to retrieve data from a server. When a client sends a GET request, it asks for resource representation, such as fetching user details or a collection of records. This method is considered safe and idempotent—repeated identical requests have the same effect and do not modify server data. Query parameters are visible in the URL, making GET unsuitable for transmitting sensitive information.
POST
POST is employed to create new resources or submit data for processing. When a client needs to add an item (e.g., register a user or upload a file), it sends a POST request containing resource details in the body. This method is not idempotent; repeating a POST may result in duplicate entries. POST is more secure than GET for sensitive data, but the resource's final location is determined by the server upon creation.
PUT
PUT updates or replaces an existing resource. Clients send the full representation of the resource they want to modify. PUT is idempotent—making the same request multiple times yields the same outcome, ensuring reliable state changes (e.g., updating a user's profile). The request URL specifies exactly which resource to update.
DELETE
DELETE removes a resource from the server. When a client issues a DELETE request, the targeted item is permanently deleted, and this action is idempotent—repeating the request has the same effect, even if the resource has already been deleted. DELETE is ideal for removing records and is handled with proper error responses if the resource does not exist.
Understanding how these methods differ is fundamental to effective REST API design, ensuring clear, predictable interactions and maintainable web services.
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