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Learn how to resolve the issue of Microsoft Graph API internal errors returning as plain text by implementing a structured response format in JSON.
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Understanding the Issue with Microsoft Graph API Error Responses

When working with the Microsoft Graph API in a .NET Core 3.1 Web API, you may have encountered a frustrating problem: receiving error responses that return as plain text with a status code indicating an internal server error. Specifically, this occurs when the API cannot find a specified resource or when there are issues with queried reference properties. But what exactly does this mean, and how can we turn these plain text errors into more manageable JSON responses?

The Problem Explained

Typically, the Microsoft Graph API throws errors that can provide valuable insights, such as error codes and messages indicating what went wrong. However, when an error occurs, the response often comes back as a generic 500 Internal Server Error along with the detail that is not structured in a user-friendly way. Here’s an example of what these responses look like:

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While the above information is useful, it lacks structure and clarity, making it difficult for developers to handle these errors gracefully in their applications.

Solution: Returning Errors in JSON Format

To enhance the clarity and effectiveness of your error handling, you can implement a few strategies to ensure that Microsoft Graph API’s error responses are returned in JSON format instead of plain text. Here’s how you can approach this:

Step 1: Identify the Error Code

The initial action is to identify the error code you are encountering. In your specific case, this is found within the Microsoft.Graph.ServiceException response. The error message often contains codes such as Request_ResourceNotFound, which will help you understand the nature of the problem when it occurs.

Step 2: Use a JSON Converter

To convert these plain text error responses into JSON format, you can utilize a JsonConverter. This allows you to structure the error information in a way that is more interpretable for your application. Here’s a simple illustration of how to achieve this using .NET Core:

Create a Custom Error Class: Define a class to encapsulate your error details.

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Implement JSON conversion: In your error handling middleware, catch the exceptions and map them to the ApiError class.

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Step 3: Return Structured JSON on Errors

Now, whenever an error occurs while communicating with the Microsoft Graph API, the response will be structured in a way that both your application and its users can easily understand. The structured JSON will typically look like this:

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Conclusion

By implementing the above approach, you can transform the way your application handles errors from the Microsoft Graph API. Instead of plain text 500 errors, you now have clear, structured JSON responses that provide essential details about what went wrong. This not only improves the debugging process but also enables better user experiences and error handling within your application.

With these changes, you’re set to tackle error handling in a more efficient manner, paving the way for robust integrations with the Microsoft Graph API.