'Angular: Cannot Get /

I am trying to open, build and run someone else's Angular 4 project but I am not able to view the project when I run it my way. I don't see what is going wrong or what I should do now. I already had everything in place to use NPM and NodeJS

The steps I took were:

Open up the project
npm install
ng serve

The project compiles the right way. (I have an own Angular app and I know how this looks like) The console is showing:

'** NG Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200 **'.

Then, when I opened up a web browser, I navigated to localhost:4200 and a web page with the following text were shown:

'Cannot GET /'

And on the console was the following text:

'GET http://localhost:4200/ 404 (Not Found)'

The project should work fine but I am not able to navigate to a working URL on the web page. Routing is set-up another way as I am used to doing this. In app.module.ts the following is implemented:

app.module.ts

const appRoutes: Routes = [
{ path: '',   redirectTo: 'tree', pathMatch: 'full' },
{ path: 'admin', component: AdminPanelComponent, canActivate: [AuthGuard],
children: [{path:'', component: PanelComponent},{path: 'add', component: 
AddTreeComponent}, {path:'manage-trees', component:ManageTreesComponent}, 
{path:'manage-users', component: ManageUsersComponent}, {path:'view-trees', 
component: ViewTreeComponent}]},
{path:'tree', component: TreeComponent},
{path:'error', component: ErrorComponent},
{path:'unauthorized', component: UnauthorizedComponent},
{path:'login', component: LoginComponent},
{path:'entire-tree', component: EntireTreeComponent},
{ path: '**', component: PageNotFoundComponent },
];

Also opening up a web page like; localhost:4200/tree does not work. When I let angular stop serving the web page, the web page displays: "this site can't be reached'. So I think there is running something at localhost:4200... Also, another project of this person behaves the same way.

Does anybody know what is going on?

EDIT

app.module.ts

RouterModule.forRoot(appRoutes, { useHash: true })

Package.json

{
"name": "xxx",
"version": "0.0.0",
"license": "MIT",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/animations": "^4.0.0",
"@angular/common": "^4.0.0",
"@angular/compiler": "^4.0.0",
"@angular/core": "^4.0.0",
"@angular/forms": "^4.0.0",
"@angular/http": "^4.0.0",
"@angular/platform-browser": "^4.0.0",
"@angular/platform-browser-dynamic": "^4.0.0",
"@angular/router": "^4.0.0",
"angular-oauth2-oidc": "^1.0.20",
"angular-polyfills": "^1.0.1",
"angular2-jwt": "^0.2.3",
"angular2-spinner": "^1.0.10",
"bootstrap": "^3.3.7",
"core-js": "^2.4.1",
"ngx-bootstrap": "^1.8.0",
"rxjs": "^5.1.0",
"zone.js": "^0.8.4"
},
"devDependencies": {
"@angular/cli": "1.2.4",
"@angular/compiler-cli": "^4.0.0",
"@angular/language-service": "^4.0.0",
"@types/jasmine": "2.5.45",
"@types/node": "~6.0.60",
"codelyzer": "~3.0.1",
"jasmine-core": "~2.6.2",
"jasmine-spec-reporter": "~4.1.0",
"karma": "~1.7.0",
"karma-chrome-launcher": "~2.1.1",
"karma-cli": "~1.0.1",
"karma-jasmine": "~1.1.0",
"karma-jasmine-html-reporter": "^0.2.2",
"karma-coverage-istanbul-reporter": "^1.2.1",
"protractor": "~5.1.2",
"ts-node": "~3.0.4",
"tslint": "~5.3.2",
"typescript": "~2.3.3"
 }
}

I also see an icon next to the tab name with the label: "Error".

OBSERVATION:

New observation:

After I ran npm install -g angular-cli I wasn't able to run ng serve. (You have to be inside an angular-cli project in order to use the build command after reinstall of angular-cli)

Then I ran npm install -g @angular/cli@latest and I was able to use ng serve again.

OBSERVATION 2:

After building the app with: 'ng build ...' there is no index.html in the 'dist' folder... When I set the website online, there is just a folder structure instead of a nice website. I think that's because there is no index.html.

Solution 1:^[1]

The problem was that I ran the commands within the folder /project/src/app. Navigating back to the project folder so to /project and running ng serve from there solved my problem.

Solution 2:^[2]

The way I resolved this error was by finding and fixing the error that the console reported.

Run ng build in your command line/terminal, and it should display a useful error, such as the example in red here: Property 'name' does not exist on type 'object'.

Solution 3:^[3]

For me it also was problem with path, but I had percentage sign in the root folder.

After I replaced %20 with space, it started to work :)

Solution 4:^[4]

I had the same error caused by build errors. I ran ng build in the directory of my application which helped me correct my errors

Solution 5:^[5]

I had the same problem with an Angular 9.

In my case, I changed the angular.json file from

"aot": true

"aot": false

It works for me.

Solution 6:^[6]

Check if in index.html base is set

<head>
  <base href="/">
  ...
</head>

Solution 7:^[7]

I was using export class TestCalendar implements OnInit{} but i did not write the function

 ngOnInit() {
    /* Display initial */
  }

. After running the command ng serve , i found out that i was not using ngOnInit(){} . Once i implemented, it started working fine. Hope it helps someone.

Solution 8:^[8]

I had the same problem with an Angular 6+ app and ASP.NET Core 2.0

I had just previously tried to change the Angular app from CSS to SCSS.

My solution was to go to the src/angularApp folder and running ng serve. This helped me realize that I had missed changing the src/styles.css file to src/styles.scss

Solution 9:^[9]

Just figured out the reason when we type "ng serve" INSIDE OUR PROJECT..
for example C:\Users\EdgeTech1\Desktop\CSharp\WebAPI\MyProject>ng serve

could not resolve module C:\Users\EdgeTech1\Desktop\C
results: failed compiled

root cause:
My folder name was C# Project..

Note: I tried to remove the # in my Project Name, I rename C# Project to CSharp instead and I tried to open cmd prompt again, typed the same thing..

for example:

C:\Users\EdgeTech1\Desktop\CSharp\WebAPI\MyProject>ng serve

and my project compiled successfully.. so as much as possible avoid ASCII characters in naming projects files.

Solution 10:^[10]

I was referring to one of my provider with two different casing. One of them was wrong but only the webpack compiler was complaining. I had to step into the ClientApp folder and use ng build or ng serve to see the errors. (ASP.NET Core SPA with Angular 5)

Solution 11:^[11]

Check baseHref is set to "/" ( angular.cli )

    "architect": {
        "build": {
            "builder": "@angular-devkit/build-angular:browser",
            "options": {
                "baseHref": "/"

if it didn't work, check if your base href in your index.html is set to "/"

Solution 12:^[12]

For me the issue was with @Component Selector path was pointing to wrong path. After changing it solved the issue.

@Component({
selector: 'app-fetch-data',
templateUrl: './fetch-data.component.html',
providers: [ToolbarService, GroupService, FilterService, PageService, ExcelExportService, PdfExportService]
})

Solution 13:^[13]

This error can apparently happen for a number of reasons. Here is my experience for those who land here after searching for "Cannot GET /"

I experienced this error when I installed ng-bootstrap v6 into an Angular 8 project. I downgraded ng-bootstrap to v5 and it seems to be okay now, since ng-bootstrap v6 is only compatible with Angular 9.

This happened while working in Visual Studio 2019 with the Angular .NET Core template. At the same time, the output panel of Visual Studio displayed this esoteric sounding error: "TS1086: An accessor cannot be declared in ambient context," which led me here, which, after a little reading, made me think it was a versioning issue. It appears that it was.

I fixed it by changing "@ng-bootstrap/ng-bootstrap": "^6.0.0"," to "@ng-bootstrap/ng-bootstrap": "^5.0.0" in the package.json file and rebuilding.

Solution 14:^[14]

if you changed any name or file component , check if it is the right name

@NgModule({
  declarations: [
    NewNameComponent
  ],
  imports: [
    CommonModule,
  ],
  exports:[
    NewNameComponent
     ]
})
export class YourModule { }

Solution 15:^[15]

Generally it is a versioning issue. Node.js v8 cannot compile with angular-cli 6.0 or later. angularcli v6 and above will work for lastest node versions. Please make sure if your node version is v8, then you need to install angular-cli upto 1.7.4. enter ng -v command in cmd and check the cli and node versions.

Solution 16:^[16]

See this answer here. You need to redirect all routes that Node is not using to Angular:

app.get('*', function(req, res) {
  res.sendfile('./server/views/index.html')
})

Solution 17:^[17]

You can see the errors after stopping debbuging by choosing the option to display ASP.NET Core Web Server output in the output window. In my case I was pointing to a different templateUrl.

Solution 18:^[18]

First, delete existing files package.lock.json and node_modules from your project. Then, the first step is to write npm cache clean --force. Second, also write this command npm i on the terminal. This process resolve my error. :D

Solution 19:^[19]

Many answers dont really make sense but still have upvotes, makes me currious why that would still work in some cases.

In angular.json

"serve": {
  "builder": "@angular-devkit/build-angular:dev-server",
  "options": {
    "deployUrl": "/",
    "baseHref": "/",

worked for me.

Solution 20:^[20]

For me the problem was that I had saved my project folder under C:\Users\... which indeed is a problem. After I saved it under C:\ then npm install and ng serve --open it worked just fine!

Solution 21:^[21]

In my angular.json file the deployUrl was set to static/ang.

"architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "deployUrl": "/static/ang/",
             ....

This was causing my application to get served from localhost:4200/static/ang

Removing deployUrl fixed it for me.

EDIT: I shifted deployUrl to under configurations since it was important when building for production. (Since my lazy loaded chunks were not getting served on the static url).

"architect": {
            "build": {
              "builder": "@angular-devkit/build-angular:browser",
              "options": {
                 ....
                 ....
               },
               "configurations": {
                  "deployUrl": "/static/ang/",

Solution 22:^[22]

Bumped into same issue, I tried this: -ng build

And it worked!

Solution 23:^[23]

Another problem may be that you're importing the component instead of it's module.

imports: [
  YourComponent, // <-- Should be YourComponentModule
]

Solution 24:^[24]

The weird thing that I was experiencing was that I could make changes to the components in Visual Studio 2019 while the app was running and see my changes but, when I restarted the app, I got the Cannot Get / error. Instead of running IIS Express, I chose to run the app using Angular JS and the build window showed me that there was an error in app.component.ts. It turned out to be an extra } at the end of the file. Not sure how it got there but, when I removed it, the app works fine.

Solution 25:^[25]

For me the issue was that my local CLI was not the same version as my global CLI - updating it by running the following command solved the problem:

npm install --save-dev @angular/cli@latest

Solution 26:^[26]

Deleting node modules folder worked for me.

Delete the node modules folder
Run npm install.
Re-run the application and it should work.

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	Klyner
Solution 2	eggy
Solution 3	yezior
Solution 4	J.Kirk.
Solution 5	NIKET PATEL
Solution 6	Salih ?enol Çakarc?
Solution 7	MuhammadMohsan
Solution 8	MaylorTaylor
Solution 9	Tiw
Solution 10	Perrier
Solution 11	Saad Joudi
Solution 12	DonMax
Solution 13
Solution 14	nativelectronic
Solution 15	user11193342
Solution 16	jcroll
Solution 17
Solution 18
Solution 19	Andre Elrico
Solution 20	Panagiotis D.
Solution 21
Solution 22	Zagros
Solution 23	RaphaÃ«l Balet
Solution 24	Louis Datz
Solution 25	veben
Solution 26	JoSSte

'Angular: Cannot Get /

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