[angular] Can't bind to 'ngForOf' since it isn't a known property of 'tr' (final release)

I'm using Angular2 Final release (2.1.0). When I want to display a list of companies, I got this error.

in file.component.ts :

public companies: any[] = [
    { "id": 0, "name": "Available" },
    { "id": 1, "name": "Ready" },
    { "id": 2, "name": "Started" }
];

in file.component.html :

<tbody>
  <tr *ngFor="let item of companies; let i =index">
     <td>{{i}}</td>
     <td>{{item.name}}</td>
  </tr>
</tbody>

For me, what solved the problem was to do a git clone of my project and run (as usual):

npm install

Just in case someone still facing an error after trying to import CommonModule, try to restart the server. It surprisingly work

I had a problem because of ** instead *

*ngFor="let ingredient of ingredients"

**ngFor="let ingredient of ingredients"

In my case, the issue was that my teammate mentioned *ngfor in templates instead of *ngFor. Strange that there is no correct error to handle this issue (In Angular 4).

I received the error because the component I was using wasn't registered in the declarations: [] section of the module.

After adding the component the error went away. I would have hoped for something less obscure than this error message to indicate the real problem.

You have to import 'CommonModule' in the module where you are using these in-built directives like ngFor,ngIf etc.

import { CommonModule } from "@angular/common";


@NgModule({
  imports: [
    CommonModule
  ]
})

export class ProductModule { }

I was getting the same error, You can fix through one of this method:

1. If you don't have any nested module

   a. Import the CommonModule in your App module

   b. Import your Component where you are adding the *ngFor in the App Module, define in declarations

// file App.modules.ts
@NgModule({
  declarations: [
    LoginComponent // declarations of your component
  ],
  imports: [
    BrowserModule
    DemoMaterialModule,
    FormsModule,
    HttpClientModule,
    ReactiveFormsModule,
    AppRoutingModule,
    BrowserAnimationsModule,
    ServiceWorkerModule.register('ngsw-worker.js', { enabled: environment.production })
  ],
  providers: [
    ApiService, 
    CookieService, 
    {
      provide: HTTP_INTERCEPTORS,
      useClass: ApiInterceptor,
      multi: true
    }
  ],
  bootstrap: [AppComponent]
})

c. If you are using the separate module file for routing then Import the CommonModule in your Routing module else Import the CommonModule in your App module

// file app.routing.modules.ts
import { LoginComponent } from './login/login.component';
import { CommonModule } from "@angular/common";

const routes: Routes = [
  { path: '', component: LoginComponent },
  { path: 'login', component: LoginComponent }
];

@NgModule({
  imports: [RouterModule,RouterModule.forRoot(routes), CommonModule],
  exports: [RouterModule]
})

2. If you have nested module then perform the 1st step in that particular module

In my case, the 2nd method solved my issue.
Hope this will help you

So please make sure

1. No syntax error in directives

2. Browser (in App Module) and Common (in other/child) Modules are imported (Same what Günter Zöchbauer mentioned above)

3. If you've routes in the application then route module should be imported in App Module

4. All the routed component's Module are also imported in App Module, for eg: app-routing.module.ts is as follows:

   const routes: Routes = [

   {path: '', component: CustomerComponent},

   {path: 'admin', component: AdminComponent}

   ];

Then App module must imports modules of CustomerComponent and AdminComponent in @NgModule().

This can also happen if you don't declare a route component in your feature module. So for example:

feature.routing.module.ts:

...
    {
        path: '',
        component: ViewComponent,
    }
...

feature.module.ts:

     imports: [ FeatureRoutingModule ],
     declarations: [],

Notice the ViewComponent is not in the declarations array, whereas it should be.

There can be any possible reason:

1. Your module does not have CommonModule in imports[]
2. Your component, where you are using *ngFor, is not a part of any module.
3. You might have syntax error in *ngFor i.e. **ngFor or *ngfor etc. typo.
4. If everything seems fine then restart your IDE i.e. VS Code, IntelliJ etc.

app.module.ts fixed and changed to: import the BrowserModule in your app module

import { BrowserModule } from '@angular/platform-browser';

@NgModule({
  declarations: [
    AppComponent    
  ],
  imports: [
    BrowserModule, 
  ],     
  providers: [],
  bootstrap: [AppComponent]
})

When use "app-routing.module" we forget import "CommonModule". Remember to import!

import { CommonModule } from "@angular/common";
@NgModule({  imports: [ CommonModule]})

Future Readers

Check each of the following:

1. The component is declared in a SINGLE angular module
2. Make sure you have import { CommonModule } from '@angular/common';
3. Restart the IDE/editor
4. Restart the dev server (ng serve)

If you are making your own module then add CommonModule in imports in your own module

A lot of answers seem to converge by importing CommonModule in other(new/custom) modules.
This step only isn't enough in all situations.

The full solution consist in two steps:

1. Make directives NgIf, NgFor etc visible to your project.
2. Reassemble everything in a correct way in the main component (app.module.ts)

Point 1
BrowserModule in main module seems to be enough for having access to NgFor. Angular Documentation stands it here: .

CommonModule Exports all the basic Angular directives and pipes, such as NgIf, NgForOf, DecimalPipe, and so on. Re-exported by BrowserModule,

See also accepted answer here: CommonModule vs BrowserModule in angular

Point 2
The only changes needed (in my case) are the followings:

1. import Module OtherModule
2. import Component OtherComponent
3. ng build (important!)
4. ng serve

app.module.ts

@NgModule({
    imports: [
        BrowserModule,
        OtherModule
    ],
    declarations: [OtherComponent, AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule {
}

other.html

<div *ngFor='let o of others;'> 
</div>

other.component.ts

@Component({
    selector: 'other-component',
    templateUrl: './other.html'
})
export class OtherComponent {
}

app.module.ts

@NgModule({
    imports: [],
    providers: []
})
export class OtherModule{
}

I have encountered a similar error (*ngIf) even if all my imports were OK and the component was rendered without any other error + routing was OK.

In my case AppModule was not including that specific module. The strange thing is that it did not complain about this, but this might be related with how Ivy works with ng serve (kind of loads modules according to routing, but its dependencies are not considered).

I had the same error but I had the CommonModule imported. Instead I left a comma where it shouldn't be because of copy/paste when splitting a module:

@NgModule({
    declarations: [
        ShopComponent,
        ShoppingEditComponent
    ],
    imports: [
        CommonModule,
        FormsModule,
        RouterModule.forChild([
            { path: 'shop', component: ShopComponent }, <--- offensive comma
        ])
    ]
})

For me the problem was that I did not import the custom made module HouseModule in my app.module.ts. I had the other imports.

File: app.module.ts

import { HouseModule } from './Modules/house/house.module';

@NgModule({
  imports: [
    HouseModule
  ]
})

Things to remember:

When custom modules are used (modules other than AppModule) then it is necessary to import the common module in it.

yourmodule.module.ts

import { CommonModule } from '@angular/common';

@NgModule({
  imports: [
    CommonModule
  ],
  exports:[ ],
  declarations: []
})

For Angular 10:

1. Add BrowserModule to the imports of your routes module.
2. Make sure that you added the component that not working to the app module declarations.

Failing to do step 2 will trigger this error!

Make sure to RESTART ng serve !!!

After using correct syntax in all of your code, please see if you have mentioned your component in the declarations of your angular module. Something like below:

@NgModule({ declarations: [ AppComponent, YourComponent ],

I am started on Angular8 base live project got the above issue but When use "app-routing.module" we forget import "CommonModule". Remember to import!

import { CommonModule } from '@angular/common';

@NgModule({
  imports: [
    CommonModule
]})

It will solve your error.

Custom Module Needs common module

import { CommonModule } from "@angular/common";


@NgModule({
  imports: [
    CommonModule
  ]
})