Property 'map' does not exist on type 'Observable<Response>'

Question

I am trying to call an API from Angular but am getting this error:

Property 'map' does not exist on type 'Observable<Response>'

The answers from this similar question didn't solve my issue: Angular 2 beta.17: Property 'map' does not exist on type 'Observable<Response>'.

I am using Angular 2.0.0-beta.17.

Solution 1

You need to import the map operator:

import 'rxjs/add/operator/map'

Or more generally:

import 'rxjs/Rx';

---

Notice: For versions of RxJS 6.x.x and above, you will have to use pipeable operators as shown in the code snippet below:

import { map } from 'rxjs/operators';
import { HttpClient } from '@angular/common/http';

// ...
export class MyComponent {
  constructor(private http: HttpClient) { }
  getItems() {
    this.http.get('https://example.com/api/items').pipe(map(data => {})).subscribe(result => {
      console.log(result);
    });
  }
}

This is caused by the RxJS team removing support for using See the breaking changes in RxJS' changelog for more info.

From the changelog:

operators: Pipeable operators must now be imported from rxjs like so: import { map, filter, switchMap } from 'rxjs/operators';. No deep imports.

Solution 2

Revisiting this because my solution isn't listed here.

I am running Angular 6 with rxjs 6.0 and ran into this error.

Here's what I did to fix it:

I changed

map((response: any) => response.json())

to simply be:

.pipe(map((response: any) => response.json()));

I found the fix here:

https://github.com/angular/angular/issues/15548#issuecomment-387009186

Solution 3

Just write this command in the VS Code terminal of your project and restart the project.

npm install rxjs-compat

You need to import the map operator by adding this:

import 'rxjs/add/operator/map';

Solution 4

For the Angular 7v

Change

import 'rxjs/add/operator/map';

To

import { map } from "rxjs/operators"; 

And

 return this.http.get('http://localhost/ionicapis/public/api/products')
 .pipe(map(res => res.json()));

Solution 5

I had the same issue with Angular 2.0.1 because I was importing Observable from

import { Observable } from 'rxjs/Observable';

I resolve my problem on importing Observable from this path instead

import { Observable } from 'rxjs';

View more solutions

Comments

[Malik Kashmiri]

Invalid module name in augmentation, module '../../Observable' cannot be found. Property 'map' does not exist on type 'Observable<Response>'.

[Thierry Templier]

How do you import the Observable class? Like this: import {Observable} from 'rxjs/Observable'; or import {Observable} from 'rxjs/Rx';?

[Malik Kashmiri]

i am not import this class so far

[Thierry Templier]

Okay you use observables indirectly. I think that it's a problem related to your version of rxjs. See github.com/ocombe/ng2-translate/issues/81. Could you give versions of Angular2 and Rxjs you use?

[Malik Kashmiri]

angular 2.0.0-beta*17 and rxjs 25.0.0-beta7

[Thierry Templier]

I think that you use rxjs 5.0.0-beta2 with angular2 beta17.

[Darshan Puranik]

I am using Angular 2 RC1 and rxjs 5.0.0-beta2. I have imported Observable as import {Observable} from 'rxjs/observable'; and imported map operator like import 'rxjs/add/operator/map'; It was working when I was using Beta 7. I just upgraded to RC1 and it broke.

[Mohan Ram]

I feel its not right to include rxjs-operators in every services. It should be included only at app.module.ts but unfortunately ng test throws error if operators are not imported in specific places

[Sarun Intaralawan]

This practice is considered not bundle-size-friendly since that statement imports all operators of Observable (including the ones that you don't use) into the bundle. Instead, you should import each operator individually. I recommend using "lettable operators", which was introduced in RxJS v5.5 to support better tree-shaking.

[Devner]

@AndrewBenjamin I highly suggest that you do that. That will save you a lot of trouble down the lane.

[CE_REAL]

There have been more changes, see this page: github.com/ReactiveX/rxjs/blob/master/MIGRATION.md

[Joe]

I'm not sure why the migration tool rxjs-5-to-6-migrate doesn't pick this up? It's interesting that it doesn't address the do/tap re-mapping which in my environment is still unresolved even though the import tool recognizes it. 90% of my 'unanticipated wasted time' in Angular development is spent with RxJS document and code boundary issues, this is really frustrating.

[malvadao]

Thank you! You are a lifesaver!! Whoever is interested, the full reference to this change is available here: github.com/ReactiveX/rxjs/blob/master/…

[paul]

This worked for me, I also needed to add import { map } from 'rxjs/operators';

[Max]

Funny, this is exactly how we fixed it on angular 6 upgrade - which brought the latest rxjs too.

[FindOutIslamNow]

@paul Thanks. Regarding .catch, we can use catchError like .pipe(catchError(this.handleError)) ?

[Hang]

Yes, I'm using Angular6 and syntax from this post now works for me stackoverflow.com/questions/50527873/…

[Karan Raiyani]

First write this command in vs code terminal of your project and restart the project. npm install rxjs-compat , than import the map operator.

[atconway]

Take note of this answer as anyone doing RxJS v6 will need to use the .pipe() or none of the operators will work directly off the Observable. You'll see an error like, Property 'share' does not exist on type 'Observable<{}>'

[Ajay Takur]

if it does not work close all the files and restart the vs studio.

[punkologist]

it helped me @Katana24 as I saw the correct syntax with pipe.

[Tom Faltesek]

This late answer is redundant.

[trustidkid]

Please don't forget to import 'rxjs/add/operator/map'

[Giacomo Brunetta]

@ThierryTemplier Using Angular9 the same code of yours (changing url of course) it give me 'undefined'. Url return a json result if you try to put on browser

[mrapi]

that solution works good in angular 10 where not need to install rxjs-compat that will give warnings like 'Fix CommonJS or AMD dependencies can cause optimization bailouts'

[Nisanur]

@FindOutIslamNow , thanks for answer about catchError. I use it after ı solved another problem :)

[Eric]

How do you access the JSON object through this? When i try to print the JSON string with console.log(), I only get a Observable<Any> object?

[Nick Patterson]

This is the way to go with Angular 12, apparently. Thanks!