How to Fix: Swashbuckle/Swagger + ASP.Net Core: "Failed to load API definition"
Swagger API definition not loaded due to missing HTTP action.
📋 Table of Contents
To resolve the "Failed to load API definition" error in ASP.NET Core with Swashbuckle and Swagger, you need to explicitly define HTTP actions for all methods.
🔍 Why This Happens
- [Cause]
🔧 Proven Troubleshooting Steps
Method 1: Add Action Attribute to the Method
- Step 1: Open your controller file and add the [HttpGet] attribute above the Index() method.
Method 2: Define API Actions in Swashbuckle
- Step 1: In the Startup.cs file, add the SwaggerOptions to the ConfigureServices method.
🎯 Final Words
By following these steps, you should be able to resolve the "Failed to load API definition" error and successfully generate Swagger documentation for your ASP.NET Core application.
❓ Frequently Asked Questions
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