Скачать или смотреть How to Send JSON Parameters Using [FromBody] in ASP.NET Core with POSTMAN

Learn how to effectively post JSON parameters in your ASP.NET Core application using POSTMAN, with an example method that involves multiple parameters.
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How to Send JSON Parameters Using [FromBody] in ASP.NET Core with POSTMAN

In modern web development, sending data to a server is a common task, especially in RESTful API development. If you're working with ASP.NET Core and need to send JSON parameters using POSTMAN, you may find yourself confused about how to properly format your requests. This guide will guide you through the process of posting JSON parameters in an ASP.NET Core application effectively.

The Problem: Posting JSON Parameters

You have a method in your ASP.NET Core application that requires multiple parameters sent via a JSON object. The initial setup has these requirements:

You want to POST data containing multiple fields (like os, type, versionCode, etc.).

You might not know the exact way to structure your POST request in POSTMAN to ensure compatibility with your controller's [FromBody] annotation.

Here’s the initial method structure in your ASP.NET Core application:

[[See Video to Reveal this Text or Code Snippet]]

The Solution: Properly Structuring Your Request

The key to successfully sending JSON parameters lies in how you define your object and how you structure your POST request. Here’s a step-by-step breakdown.

1. Define a Model Class

Instead of passing each parameter separately, it's more efficient and cleaner to define a model class. This model will correspond to the JSON structure you're expecting:

[[See Video to Reveal this Text or Code Snippet]]

2. Update the Controller Method

Next, update your controller method to accept this model class as a parameter:

[[See Video to Reveal this Text or Code Snippet]]

3. Using POSTMAN to Make the Request

Now it's time to send your request via POSTMAN. Follow these steps:

Select POST Method: Make sure you select POST from the dropdown.

Enter the URL: Input your endpoint URL, for example, http://localhost:5000/CreateStartMessage.

Set Headers: Ensure you set the Content-Type header to application/json.

Add JSON Body: In the body section, select raw and then choose JSON from the dropdown. Here’s the JSON structure to include:

[[See Video to Reveal this Text or Code Snippet]]

4. Send the Request

Once you have filled in all the required information in POSTMAN, simply hit the Send button. You should receive a response from your server based on the logic implemented in your controller.

Conclusion

Sending JSON parameters using [FromBody] in ASP.NET Core is straightforward when you structure it correctly. By defining a model class, updating your controller method, and utilizing POSTMAN to format your request, you can effectively send data to your API endpoint. Follow the steps outlined in this blog, and you'll be on your way to successfully launching your application with minimal hassle.

Now that you have the knowledge, go ahead and implement these techniques in your projects!