Error: The specified property 'Body' is not found within the type '{}'

Looking for some assistance here. I've created an http.get method like this:

return this.http
      .get(url)
      .map((response: Response) => {
        response = response.json(); //
        console.log('The http get response', response);
        return response;
      })
      .catch(this.handleError);

This is what the response structure appears to be:

{Body: "[{"Id":1,"Name":"Tomato Soup","Category":"Grocerie…e":"Hammer","Category":"Hardware","Price":16.99}]"}

Here's how I'm handling the subscription to the http.get method:

this.azureService.messageBody.subscribe(
      (response: Response) => {
        this.msgBodyDetail = JSON.parse(response.Body);
      }

The variable msgBodyDetail is defined as a string type. However, I'm running into a typescript error related to response.Body:

this.msgBodyDetail = JSON.parse(response.Body);

The error is : [ts] Property 'Body' does not exist on type 'Response'.
any

Even with the error, the application seems to be functioning as expected.

console.log('Response', JSON.parse(response.Body));

Upon execution, the output is:

Response: 
0 : {Id: 1, Name: "Tomato Soup", Category: "Groceries", Price: 1}
1 : {Id: 2, Name: "Yo-yo", Category: "Toys", Price: 3.75}
2 : {Id: 3, Name: "Hammer", Category: "Hardware", Price: 16.99}

Any suggestions on resolving the typescript error would be greatly appreciated.

Thank you, Lino

Answer №1

Allow me to further elaborate on @Amit's response to clarify why you are experiencing this issue.

.map((response: Response) => {
    response = response.json(); //
    console.log('The http get response', response);
    return response;
})

It seems that you have defined a parameter response of type Response.

Since you did not specify the return type of your function, it assumes the return type to be Response because you are returning the reassigned parameter. However, as an Angular class, it does not have a Body member.

By using response['Body'] with the array notation, you are bypassing the typing and accessors, which resolves the error temporarily.

Although this workaround works, it is not considered a clean solution.

The recommended approach is to type your function and return the appropriate type as shown below:

messageBody(): Observable<{Body: any[]}> { // You can replace any with a class if you have one
return this.http
  .get(url)
  .map((response: Response) => {
    console.log('The http get response', response);
    return response.json();
  })
  .catch(this.handleError);
}

Answer №2

When you use response.json(); to map the response, you can no longer set it to type Response in the subscribe function.

The json(); method returns any type, so you have the option to set it as any type or create an interface for your response.

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