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

I'm using Angular2 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>

angular angular2-template

Solution 1:^[1]

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).

Solution 2:^[2]

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 { }

Solution 3:^[3]

There can be any possible reason:

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

Solution 4:^[4]

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
  ]
})

Solution 5:^[5]

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.

Solution 6:^[6]

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: []
})

Solution 7:^[7]

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.

Solution 8:^[8]

Future Readers

Check each of the following:

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

Solution 9:^[9]

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

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]
})

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

Solution 10:^[10]

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

Solution 11:^[11]

Add the component to your app.module

import { ModalComponent } from './modal/modal.component';

@NgModule({
  declarations: [ModalComponent],
  entryComponents: [ModalComponent],
  
  }),
  providers: [
  ],
  bootstrap: [AppComponent]
})

Solution 12:^[12]

For Angular 10:

Add BrowserModule to the imports of your routes module.
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 !!!

Solution 13:^[13]

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

Solution 14:^[14]

So please make sure

No syntax error in directives
Browser (in App Module) and Common (in other/child) Modules are imported (Same what Günter Zöchbauer mentioned above)
If you've routes in the application then route module should be imported in App Module
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().

Solution 15:^[15]

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:

Make directives NgIf, NgFor etc visible to your project.
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:

import Module OtherModule
import Component OtherComponent
ng build (important!)
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{
}

Solution 16:^[16]

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 ],

Solution 17:^[17]

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
        ])
    ]
})

Solution 18:^[18]

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]
})

Solution 19:^[19]

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).

Solution 20:^[20]

Custom Module Needs common module

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


@NgModule({
  imports: [
    CommonModule
  ]
})

Solution 21:^[21]

I had the same problem, even though I had imported "BrowserModule" and "CommonModule" in "module.ts" it didn't work, my error was, not adding in "NgModule.declarations" my Component.

@NgModule ({
   declarations: [
     Your_Component // here
   ]
})

Solution 22:^[22]

if you already imopted (BrowserModule, CommonModule, FormsModule) and its still not working

then all you have to do is check if the component that has the error is declared in the module

Solution 23:^[23]

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

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

Solution 24:^[24]

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.

Solution 25:^[25]

I had a problem because of ** instead *

*ngFor="let ingredient of ingredients"

**ngFor="let ingredient of ingredients"

Solution 26:^[26]

For future reference, I'm doing some unit testing on Angular 12 and ran into this.

My issue was that I was using the ng bootstrap library and testing a method that was creating a new modal with NgbModal.

I was getting these warnings because I had forgotten to import the component being created by the popup.

I did not need to import FormsModule, CommonModule, or BrowserModule.

So, if you run into these errors make sure that the component you're trying to create an instance of is listed in the imports.

Solution 27:^[27]

If you have module implementation, then you must import the component and set the component in the declaration

Good Luck on your coding :)

Solution 28:^[28]

Just had the same issue after modifying a couple of components. There was no syntax error and all modules were imported, but a restart of the server fixed the issue. The error occurred in a component, that was added several dozen successful commits ago.

Just in case someone else experiences the same issue.

Solution 29:^[29]

I think my scenario is a rare case, but I will answer anyway.

I didn't have any syntax errors, I imported BrowserModule, I restated my IDE (VS Code), but I still got red lines in my template because I used *ngFor.

I happened because I was using an extension, Angular Language Service, but it was quite old. After updating it, the error stopped appearing.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Mr_Green
Solution 2	David Wolf
Solution 3
Solution 4	Ruben Szekér
Solution 5	Max Mumford
Solution 6	Rut Shah
Solution 7	Malcolm Swaine
Solution 8
Solution 9
Solution 10	Alok Kamboj
Solution 11	Lokesh G
Solution 12	Ziv Barber
Solution 13	Ahmad Alfy
Solution 14	Abhinav Saxena
Solution 15
Solution 16	Maddy
Solution 17	scsx
Solution 18
Solution 19	Alexei - check Codidact
Solution 20	Ahmad Alfy
Solution 21	Yudner
Solution 22	Mohamed Ali
Solution 23	Juan Carlos WebMaster Ajahuana
Solution 24	Nagnath Mungade
Solution 25	sunleo
Solution 26	JeffryHouser
Solution 27	Chamath Jeevan
Solution 28	Daniel Methner
Solution 29	John

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

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