Check Post API data valid Json or not in .net core Web API

Question

Check Post API data valid Json or not in .net core Web API

Binumon George 161

Hi All,

 I am creating one Post API for external Users. API  included string, DateTime, Integer  fields.  This may contain List of datas. So  there is a possibilities like user can enter string values in int and datetime fields. So how we can prevent user entering wrong values in fields and how we can check data is Valid Json or not. I am using .net core 6.  There is Another possibilities user can call this API programatically and assign datas

AgaveJoe 30,126 Reputation points

2023-01-13T11:51:54.4933333+00:00

there is a possibilities like user can enter string values in int and datetime fields.

C# is strongly typed. If the client send a 'abc' but the property is defined int then mode binder will throw an exception. ASP.NET also comes with model validation were you get to further define validation rules.

Model validation in ASP.NET Core MVC and Razor Pages

There is Another possibilities user can call this API programatically and assign datas

It is unusual if a Web API is NOT called programmatically. Can you clarify?

Given you question, I think going through a few beginning level tutorials will help clarify how Web API works.

Tutorial: Create a web API with ASP.NET Core
Anonymous

2023-01-16T05:43:43.27+00:00

Hi @Binumon George

how we can prevent user entering wrong values in fields and how we can check data is Valid Json or not. I am using .net core 6.

In Asp.net core API, if the JSON/Parameter value is in valid, it will automatically trigger an HTTP 400 response, and show the validation errors.

To prevent user to enter wrong values, you could enable client-side validation, if user entered wrong or invalid value, directly show the validation error and prevent submit the data to the API method. Or before calling the API method, you could use the TryValidateModel method to validate the model manually, after that call the API method with the valid parameter.

Best regards,
Dillion

Your answer

AgaveJoe 30,126 Reputation points

2023-01-13T11:51:54.4933333+00:00

there is a possibilities like user can enter string values in int and datetime fields.

C# is strongly typed. If the client send a 'abc' but the property is defined int then mode binder will throw an exception. ASP.NET also comes with model validation were you get to further define validation rules.

Model validation in ASP.NET Core MVC and Razor Pages

There is Another possibilities user can call this API programatically and assign datas

It is unusual if a Web API is NOT called programmatically. Can you clarify?

Given you question, I think going through a few beginning level tutorials will help clarify how Web API works.

Tutorial: Create a web API with ASP.NET Core
Anonymous

2023-01-16T05:43:43.27+00:00

Hi @Binumon George

how we can prevent user entering wrong values in fields and how we can check data is Valid Json or not. I am using .net core 6.

In Asp.net core API, if the JSON/Parameter value is in valid, it will automatically trigger an HTTP 400 response, and show the validation errors.

To prevent user to enter wrong values, you could enable client-side validation, if user entered wrong or invalid value, directly show the validation error and prevent submit the data to the API method. Or before calling the API method, you could use the TryValidateModel method to validate the model manually, after that call the API method with the valid parameter.

Best regards,
Dillion

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Check Post API data valid Json or not in .net core Web API

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