Retrieve a specific data point from a web API using Angular framework

Question

Retrieve a specific data point from a web API using Angular framework

Objective: How can I retrieve the specific value "test" in Angular?

Issue: An error message is being displayed.

Error: SyntaxError: Unexpected token e in JSON at position 1 at JSON.parse ()

Which syntax element am I missing?

ASP.NET

// Retrieve "test" from https://localhost:44353/api/Jobadvertisement/VVValidate/4
[HttpGet("VVValidate/{id:int}")]
public ActionResult<String> VVValidate(int id)
{
    return "test";
}

Angular

const url = environment.url

let apiUrl = url + 'api/Jobadvertisement/VVValidate/' + "4";

var response = this.http.get(apiUrl).subscribe(data => {

  console.log(data);

});

https://i.sstatic.net/au70F.png

https://i.sstatic.net/y5UyR.png

asp.net angular typescript

Answer 1

Answer №1

Could you attempt to utilize httpOptions in Angular using the following code snippet?

const apiUrl = environment.apiUrl;
let endpoint = apiUrl + 'api/Jobadvertisement/VVValidate/' + "4"; 
var response = this.http.get(endpoint, { responseType: 'text' }).subscribe(data => { console.log(data); });

Answer 2

Could you attempt to utilize httpOptions in Angular using the following code snippet?

const apiUrl = environment.apiUrl;
let endpoint = apiUrl + 'api/Jobadvertisement/VVValidate/' + "4"; 
var response = this.http.get(endpoint, { responseType: 'text' }).subscribe(data => { console.log(data); });

Answer 3

Answer №2

To make the necessary change, switch ActionResult to string:

[HttpGet("VVValidate/{id:int}")]
public string VVValidate(int id)
{
    return "test";
}

Answer 4

To make the necessary change, switch ActionResult to string:

[HttpGet("VVValidate/{id:int}")]
public string VVValidate(int id)
{
    return "test";
}

Answer 5

Answer №3

When working with Angular's HttpClient, it is important to note that it expects JSON data by default. This can cause a JSON deserialization error if you try to return plain text from your API.

To avoid this error, you need to include responseType: 'text' as an option when using the get method:

httpClient.get("url", { responseType: 'text' });

For more information on this topic, refer to Angular's Documentation.

While your API code may currently work fine, there are a couple of improvements that could be made:

You can simplify your code by removing unnecessary wrappers like ActionResult and simply returning a String.
Consider using the C# type string instead of System.String. You can read more about this distinction in this article.

Implementing these changes will result in cleaner code, as shown below:

[HttpGet("VVValidate/{id:int}")]
public string VVValidate(int id)
{
    return "test";
}

Answer 6

When working with Angular's HttpClient, it is important to note that it expects JSON data by default. This can cause a JSON deserialization error if you try to return plain text from your API.

To avoid this error, you need to include responseType: 'text' as an option when using the get method:

httpClient.get("url", { responseType: 'text' });

For more information on this topic, refer to Angular's Documentation.

While your API code may currently work fine, there are a couple of improvements that could be made:

You can simplify your code by removing unnecessary wrappers like ActionResult and simply returning a String.
Consider using the C# type string instead of System.String. You can read more about this distinction in this article.

Implementing these changes will result in cleaner code, as shown below:

[HttpGet("VVValidate/{id:int}")]
public string VVValidate(int id)
{
    return "test";
}

Retrieve a specific data point from a web API using Angular framework

Answer №1

Answer №2

Answer №3

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