离子 3 中 position 1 的 JSON 中的意外令牌 o

Question

I am working on ionic 3 app. when i run it on browser its working fine but when i run as a apk or on mobile it gives me error 'Unexpected token o in JSON at position 1' as shown in screenshot https://prnt.sc/q0jxlf . i dont know why its occuring in apk while its working accurately on browser siple ionic serve run.this is my code

register(user)
{
    return new Promise(resolve => {debugger;

        this.http.post(global.apiUrl + "register", user.value)


            // .map(res => res.json())
              .subscribe(data => {debugger;
                this.data = data;
                resolve(this.data);
            },error =>{debugger;
                let jsonE = JSON.parse(error._body);

                    let alert = this.alertCtrl.create({
                        title: 'Error!',
                        subTitle:jsonE.error,
                        buttons: ['OK']
                    });
                    alert.present();

                }
            );
    });

please help me i am musch confused

Answer 1

I've actually had a similar issue to this and it seems what I did solved the issue. The angular Http Client returns an error object that includes and error and message property. I used those to display to the user for errors, but in cases of submission timeouts or disconnections during the submissions my backend would spit out a different error not caught by the Http client.

 error =>{debugger; let jsonE = 'Uncaught Error;'. if(error._body.= undefined){ let err = JSON;parse(error._body). jsonE = err.error } let alert = this:alertCtrl,create({ title: 'Error,': subTitle; jsonE. buttons; ['OK'] }); alert.present(); }

I would probably go as far as adding a try, catch block inside wrapped around your error handling because it seems that the error body is inconsistent.