API Comparisons

Comparisons

Comparison of GET and POST Methods

Feature	GET Method	POST Method
Purpose	Retrieve data from a specified resource.	Submit data to be processed to a specified resource.
Data Location	Appended to the URL as query parameters.	Included in the body of the request.
Visibility	Visible in the URL.	Not visible in the URL.
Cacheable	Yes, responses can be cached.	No, responses are not typically cached.
Idempotent	Yes, multiple identical requests have the same effect.	No, multiple identical requests may have different effects.
Safe	Yes, does not modify resources.	No, modifies resources.
Data Length	Limited by the URL length.	Not limited by the URL length.
Use Cases	Fetching data, search queries, retrieving resources.	Submitting forms, uploading files, creating resources.
Has Body	No	Yes
Parameters	URL (query parameters)	Body (form data, JSON, etc.)

Comparison of PUT and PATCH Methods

Feature	PUT Method	PATCH Method
Purpose	Update a current resource with new data.	Apply partial modifications to a resource.
Data Location	Included in the body of the request.	Included in the body of the request.
Idempotent	Yes, multiple identical requests have the same effect.	No, multiple identical requests may have different effects.
Safe	No, modifies resources.	No, modifies resources.
Data Length	Not limited by the URL length.	Not limited by the URL length.
Use Cases	Replacing an entire resource.	Updating specific fields of a resource.
Has Body	Yes	Yes
Parameters	Body (form data, JSON, etc.)	Body (form data, JSON, etc.)

Other Comparisons

Comparison of Headers vs Query Parameters vs Path Variables

Feature	Headers	Query Parameters	Path Variables
Purpose	Provide additional information about the request or response.	Pass additional information to the server in the URL.	Identify specific resources in the URL path.
Location	Included in the request or response headers.	Appended to the URL after a question mark (?).	Included in the URL path, enclosed in curly braces ({}).
Visibility	Not visible in the URL.	Visible in the URL.	Visible in the URL.
Usage	Used for authentication, content type, caching, etc.	Used for filtering, sorting, and pagination.	Used for identifying specific resources.
Data Length	Not limited by the URL length.	Limited by the URL length.	Limited by the URL length.
Example	Authorization: Bearer your_token	GET /users?name=JohnDoe&age=30	GET /users/{userId}
Postman Display	Added in the Headers tab.	Added in the Params tab.	Displayed with a colon (:) in front of them.