[Vuejs]-API service return 200, but it is really a 404

It seems like bad API design to return a “no response found” as HTTP 200, but if you have no control over the API, you’ll just have to handle that in your success function.

Put your error handling code in a function and call it accordingly:

fetchData: function(name){
    var self = this;
    self.$http.get('http://www.apiservice.com/', {
    params: {
       city: name
    },
    }).then((response) => {
        // success callback
        if (response.Response === "False") {
            onError(response)
        } else {
            toastr.success('Success!');
            console.debug(response);
        }
    }, onError);
}

function onError(response) {
   toastr.error('Something went wrong!') 
}

You can use promise chaining to switch a promise from resolve to reject:

fetchData: function(name){
          var self = this;
          self.$http.get('http://www.apiservice.com/', {
            params: {
              city: name
            },
            }).then(response)=>{
              if(response.Response === "False"){
                return Promise.reject(response)
              }else{
                return response
              }
            },(a)=>a).then((response) => {
              // success callback
              toastr.success('Success!');
              console.debug(response);
            }, (response) => {
              // error
              toastr.error('Something went wrong!')
            });
        }

The important part is this:

then(response)=>{
  if(response.Response === "False"){
    return Promise.reject(response)
  }else{
    return response
  }
},(a)=>a)

so if the response is valid, and the data contains Response: "False" we return a rejected promise, otherwise we just return the response data, which is then wrapped in a resolved promise, after that the next then executes as before, but invalid data has already been rejected.