Скачать или смотреть Fixing JSON Serialization Issues in Vue and ASP.NET Core DTO Models

Learn how to resolve JSON serialization problems between Vue.js and ASP.NET Core, specifically addressing the common `400 Bad Request` error caused by improper data structures.
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This video is based on the question https://stackoverflow.com/q/63180640/ asked by the user 'DRW' ( https://stackoverflow.com/u/4138732/ ) and on the answer https://stackoverflow.com/a/63182040/ provided by the user 'Noah Stahl' ( https://stackoverflow.com/u/2411713/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing JSON Serialization Issues in Vue and ASP.NET Core DTO Models

If you’re building applications with Vue.js and ASP.NET Core, you may encounter various challenges, one of which is handling JSON serialization errors. A common scenario triggers a 400 Bad Request error when sending data from your Vuex store to your ASP.NET Core web API, caused specifically by mismatched data structures. In this post, we’ll explore the problem and provide a clear solution to ensure your data is sent correctly.

Understanding the Problem

When sending data from your Vue.js frontend to an ASP.NET Core backend, the structure of the data must align with what the server expects. For instance, consider the following code snippet from a Vuex store:

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This data structure is being sent to an API endpoint via Axios. However, the backend is expecting a different structure. The ASP.NET Core DTO model defines the Detail as a List<Detail>, which means it expects an array instead of an object. This mismatch leads to the following error:

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

The Solution

To resolve this issue, you need to modify the way the Detail data is structured in your JSON payload. Here's how to do it:

1. Wrap the Detail Object in an Array

Since .NET requires Detail to be an array, you can wrap your current Detail object in square brackets [], as shown below:

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2. Naming Convention Suggestion

To improve clarity and better communicate the nature of the data being sent, consider renaming the Detail property to DetailItems. This name indicates to other developers (and your future self) that it represents a collection of detail objects rather than a single entity:

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3. Sending the Data

You can send the updated data structure using Axios as follows:

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

Final Thoughts

By ensuring that the data structure matches what your backend expects, you can avoid the common 400 Bad Request error often caused by JSON serialization issues. Adjusting the Detail from an object to an array not only fixes the issue but also enhances the readability of your code by adhering to clearer naming conventions.

If you follow the steps outlined in this post, you should now be able to successfully send data from Vue.js to your ASP.NET Core API without encountering serialization errors.

Remember, the key takeaway is to ensure the data structure aligns perfectly with what your backend models expect to avoid any serialization headaches!