How to Make a POST Request Without a Form in ASP.NET: Avoiding Error 400

Learn how to resolve the `400 Bad Request` error when making a POST request without a form in ASP.NET using AJAX with an Antiforgery token. --- This video is based on the question https://stackoverflow.com/q/68501391/ asked by the user 'Joel' ( https://stackoverflow.com/u/14906700/ ) and on the answer https://stackoverflow.com/a/68501536/ provided by the user 'Nitheesh Govind' ( https://stackoverflow.com/u/10364883/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to make a post request without form and without getting error 400 Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/licensing The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/by-sa/4.0/ ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/by-sa/4.0/ ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- How to Make a POST Request Without a Form in ASP.NET: Avoiding Error 400 When working with AJAX requests in ASP.NET, a common issue developers encounter is the dreaded 400 Bad Request error, especially when trying to send a POST request without a form. If you've ever faced this challenge, you're not alone. In this guide, we will provide you with a step-by-step guide to resolving this issue, allowing you to send successful AJAX POST requests seamlessly. Understanding the Problem You might be sending a POST request to delete a category, but if the server expects a form submission, it likely requires an Antiforgery token for security. Not including this token results in a 400 error due to validation failures. Here’s a rough outline of what often happens: You set up your AJAX call correctly. The expected server route is defined but does not receive the necessary token. Consequently, the server rejects the request with a 400 Bad Request response, leading to confusion. Solution: Adding an Antiforgery Token To resolve the 400 Bad Request issue during your AJAX request, follow these organized steps: Step 1: Include the Antiforgery Token in Your View First, ensure that you include the Antiforgery token on the page where the AJAX call is initiated. Place the following code inside your Razor view: [[See Video to Reveal this Text or Code Snippet]] This line generates a hidden input field containing the token, which is necessary for validating the request on the server. Step 2: Modify Your AJAX Call to Include the Token Next, you'll need to configure your AJAX request to include the Antiforgery token. Update your AJAX call as follows: [[See Video to Reveal this Text or Code Snippet]] Step 3: Review Your ASP.NET Controller In your ASP.NET controller, ensure that your action method is properly set up to accept the POST request. Here’s how your method should typically look: [[See Video to Reveal this Text or Code Snippet]] Conclusion By including the Antiforgery token in your view and properly integrating it into your AJAX request, you should be able to send post requests without encountering the frustrating 400 Bad Request error. Always ensure that your server-side code is set up to listen for these tokens, so that your requests are authenticated correctly. If you find yourself facing any additional challenges along the way, don't hesitate to revisit the configurations of both your front-end and back-end code. Happy coding!