I try to send an POST request from Angular 4 to my Laravel backend.

My LoginService has this method:

login(email: string, password: string) { return this.http.post(` { email, password })
}

I subscribe to this method in my LoginComponent:

.subscribe( (response: any) => { console.log(response) location.reload() }, (error: any) => { console.log(error) })

And this is my Laravel backend method:

...
if($this->auth->attempt(['email' => $email, 'password' => $password], true)) { return response('Success', 200);
}
return response('Unauthorized', 401);

My Chrome dev tools says that my request was a success with 200 status code. But my Angular code triggers the error block and gives me this message:

Http failure during parsing for

If I return an empty array from my backend, it works... So Angular is trying to parse my response as JSON? How can i disable this?

13 Answers

You can specify that the data to be returned is not JSON using responseType.

In your example, you can use a responseType string value of text:

return this.http.post( ' {email, password}, {responseType: 'text'})

The full list of options for responseType is:

• json (the default)
• text
• arraybuffer
• blob

See the docs for more information.

2

I just want to add that you have to omit the generic argument on the get/post method method (.get<T>).

✔️ This will work:

this.http.get(` {responseType: 'text'})

❌ This will not work:

this.http.get<string>(` {responseType: 'text'})

The later will produce an error:

The expected type comes from property 'responseType' which is declared here on type '{ headers?: HttpHeaders | { [header: string]: string | string[]; } | undefined; observe: "events"; context?: HttpContext | undefined; params?: HttpParams | { ...; } | undefined; reportProgress?: boolean | undefined; responseType?: "json" | undefined; withCredentials?: boolean | undefined; }'

4

if you have options

return this.http.post(`${this.endpoint}/account/login`,payload, { ...options, responseType: 'text' })

2

Even adding responseType, I dealt with it for days with no success. Finally I got it. Make sure that in your backend script you don't define header as -("Content-Type: application/json);

Becuase if you turn it to text but backend asks for json, it will return an error...

1

I had the same problem and the cause was That at time of returning a string in your backend (spring) you might be returning as return "spring used"; But this isn't parsed right according to spring. Instead use return "\" spring used \"";-Peace out

4

In my case the problem was a missing "/" in the url call, just after the resource. It was then trying to fetch the angular component (html) instead of the JSON resource. I hope this helps since I did not found the answer to my question in this thread.

1

You should also check you JSON (not in DevTools, but on a backend). Angular HttpClient having a hard time parsing JSON with \0 characters and DevTools will ignore then, so it's quite hard to spot in Chrome.

Based on this article

I had the same problem, but in my case I forgot to add the proxy url to the api.

readonly apiUrl = this.appConfigService.appConfig.apiUrl + 'EndPointUrl';

This answer helped me figure it out:

For my case, I had a line break from PHP results.

E.g.,

echo json_encode($row)."\<br/>";

I removed the <br/> and all was well.

In my situation I had copied code from the documentation that used an "echo" in my API after querying another API, and the echoed text was aggregated onto the response causing invalid JSON.

I was facing the same issue in my Angular application. I was using RocketChat REST API in my application and I was trying to use the rooms.createDiscussion, but as an error as below.

ERROR Error: Uncaught (in promise): HttpErrorResponse: {"headers":{"normalizedNames":{},"lazyUpdate":null},"status":200,"statusText":"OK","url":"myurl/rocketchat/api/v1/rooms.createDiscussion","ok":false,"name":"HttpErrorResponse","message":"Http failure during parsing for myrul/rocketchat/api/v1/rooms.createDiscussion","error":{"error":{},"text":"

I have tried couple of things like changing the responseType: 'text' but none of them worked. At the end I was able to find the issue was with my RocketChat installation. As mentioned in the RocketChat change log the API rooms.createDiscussion is been introduced in the version 1.0.0 unfortunately I was using a lower version.

My suggestion is to check the REST API is working fine or not before you spend time to fix the error in your Angular code. I used curl command to check that.

curl -H "X-Auth-Token: token" -H "X-User-Id: userid" -H "Content-Type: application/json" myurl/rocketchat/api/v1/rooms.createDiscussion -d '{ "prid": "GENERAL", "t_name": "Discussion Name"}'

There as well I was getting an invalid HTML as a response.

<!DOCTYPE html>
<html>
<head>
<meta name="referrer" content="origin-when-crossorigin">
<script>/* eslint-disable */
'use strict';
(function() { var debounce = function debounce(func, wait, immediate) {

Instead of a valid JSON response as follows.

{ "discussion": { "rid": "cgk88DHLHexwMaFWh", "name": "WJNEAM7W45wRYitHo", "fname": "Discussion Name", "t": "p", "msgs": 0, "usersCount": 0, "u": { "_id": "rocketchat.internal.admin.test", "username": "rocketchat.internal.admin.test" }, "topic": "general", "prid": "GENERAL", "ts": "2019-04-03T01:35:32.271Z", "ro": false, "sysMes": true, "default": false, "_updatedAt": "2019-04-03T01:35:32.280Z", "_id": "cgk88DHLHexwMaFWh" }, "success": true
}

So after updating to the latest RocketChat I was able to use the mentioned REST API.

I use .NetCore for my back-end tasks,I was able to resolve this issue by using the Newtonsoft.Json library package to return a JSON string from my controller.

Apparently, not all JSON Serializers are built to the right specifications..NET 5's "return Ok("");" was definitely not sufficient.

Check is your JSON is valid JSON. I experience the exact same issue and I found that I had one extra comma "," in my json. If the JSON is "hardcoded" in the js file, extra comma is not a problem, but if it's served from a server, it's a problem.