What is the difference between PUT and POST?
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The main difference between PUT and POST lies in how they are used to send data to a server and what they intend to do with that data.
✅ POST – Create a new resource
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Purpose: Used to create a new resource on the server.
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Behavior: Every time you send a POST request, it creates a new item.
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Idempotent?: No. Sending the same POST multiple times may result in multiple new records being created.
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Example:
Sending POST /api/users/ with user data creates a new user.
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Purpose: Used to create a new resource on the server.
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Behavior: Every time you send a
POSTrequest, it creates a new item. -
Idempotent?: No. Sending the same
POSTmultiple times may result in multiple new records being created. -
Example:
SendingPOST /api/users/with user data creates a new user.
✅ PUT – Create or replace a resource
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Purpose: Used to update an existing resource completely, or create it if it doesn’t exist (depending on implementation).
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Behavior: It replaces the entire resource at a specific URL.
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Idempotent?: Yes. Sending the same PUT request multiple times won’t change the result after the first request.
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Example:
Sending PUT /api/users/1/ replaces all data for the user with ID 1.
Use POST to add, PUT to replace.
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Purpose: Used to update an existing resource completely, or create it if it doesn’t exist (depending on implementation).
-
Behavior: It replaces the entire resource at a specific URL.
-
Idempotent?: Yes. Sending the same
PUTrequest multiple times won’t change the result after the first request. -
Example:
SendingPUT /api/users/1/replaces all data for the user with ID 1.
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