String does not act as valid json object when returned from Controller

Question

I'm trying to read a string from a json response however I get an error:

SyntaxError: Unexpected token c in JSON at position

I have a controller which returns a guid as a string from the DB

[HttpPost("TransactionOrderId/{id}")]
public async Task<string> TransactionOrderId(int id)
{
    return await this._service.GetTransactionOrderId(id);
}

In my Angular 2 application I'm subscribing to my provider which has trouble parsing my response from my server.

this.meetingsProvider.getTransactionOrderId(this.meetingId).subscribe((transactionId: string) => {
    this.transactionOrderId = transactionId;
});

And My Provider code looks like so:

getTransactionOrderId(meetingId: number): Observable<string> {

    const headers = new Headers();
    headers.append('Content-Type', 'application/json');

    return  this.http.post(`${this.apiUrl}/${this.route}/transactionOrderId/${meetingId}`, null, {
        headers: headers
    }).map(res => <string>res.json());
}

My Server Responds with the proper transaction order id the response looks like so:

status: 200
statusText: "OK"
type: 2
url: "http://localhost/api/meetings/transactionOrderId/4"
_body: "0c290d50-8d72-4128-87dd-eca8b58db3fe"

I have other api calls using the same code that return bool which return fine, but when I try to return string I get a parsing error why?

Yeah sorry, as has been said, it's not a valid json what the server is returning — Giacomo Cerquone
– Giacomo Cerquone, Commented Oct 18, 2018 at 1:23

johnny 5 · Accepted Answer · 2018-10-18 01:35:11Z

3

That's not a valid JSON object, that's why you get that error. A JSON object starts with { and ends with }.

If you want to be able to JSON-deserialize that, use:

public async Task<JsonResult> TransactionOrderId(int id)
{
    return Json(await this._service.GetTransactionOrderId(id));
}

Note that if you return anything that is not a string, ASP.NET Core should JSON-serialize it (that's the default serializer anyway).

edited Oct 18, 2018 at 1:35

johnny 5

21.2k55 gold badges138 silver badges217 bronze badges

answered Oct 18, 2018 at 1:27

Camilo Terevinto

32.2k7 gold badges95 silver badges127 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

johnny 5 Over a year ago

Hmm, I was testing a few things before. I didn't realize only double quotes count as valid json for a string. I want to do this generically for all Tasks of string but thats outside the scope of this question. Thanks for the response

Collectives™ on Stack Overflow

String does not act as valid json object when returned from Controller

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related