What is the difference between PUT and POST request in REST APIs?

Put is use to update the resources and post is used to create resources.

PUT is idempotent means if you send n request to the server for for the same resource ,the resource will not be created instead will be updated. POST is not an idempotent means if you send n number of request to the server for the same resource n number of resource will be created Generally Put is used for update the resource and Post is used for create the resource

PUT: Used to create a resource, or overwrite it. While you specify the resources new URL. POST: Used to modify and update a resource.

PUT and POST both can be used for creating objects. PUT - Create or Update object i.e. its idempotent which means if you put an object twice it has no effect. POST - Create object i.e. it updates the data in resource and creates new instance.