How to POST a JSON Object Using HttpClient in Web API?

Using HttpClient to POST JSON Objects in Web APIs

This guide explains how to send a JSON object via a POST request using HttpClient in a Web API context.

First, create a JSON object and fill it with your data. Next, create an HttpClient instance, specifying the API endpoint URL. Set DefaultRequestHeaders.Accept to "application/json" to specify the expected response format.

Convert your JSON object into a StreamContent for transmission within the HTTP request body. Use StringContent, providing your JSON object as a string and specifying UTF-8 encoding.

Send the POST request using client.PostAsync, providing the URL and the content. This returns an HttpResponseMessage. Access the result using the .Result property.

For asynchronous operation, use await with client.PostAsync to get the HttpResponseMessage asynchronously.

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