Angular NG0403 means the NgModule passed to bootstrapModule(...) has no root component configured in its bootstrap array and does not implement ngDoBootstrap. For a conventional NgModule app, add the intended root component to that module’s @NgModule metadata. Use ngDoBootstrap only when the application deliberately controls startup manually.
What causes Angular NG0403?
Angular raises NG0403 when the module used to start the application has neither a nonempty bootstrap property nor an ngDoBootstrap method. The official NG0403 guidance documents both a missing bootstrap property and an empty array as causes.
This is a startup configuration problem in the bootstrapped module—not a missing template import. Angular needs to know which component to initialize, or the module must provide its own bootstrap logic.
Fix it with a root component
For the usual NgModule setup, list the intended root component in the bootstrap array of the module passed to bootstrapModule(...):
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@NgModule({
declarations: [AppComponent],
imports: [BrowserModule],
bootstrap: [AppComponent],
})
export class AppModule {}
platformBrowser().bootstrapModule(AppModule);The NgModule API defines bootstrap as the components Angular bootstraps when the module starts. In this example, AppComponent is the root component; replace it with the component your application is meant to initialize. Angular’s NgModules guide explains that components in bootstrap are automatically included in the module’s declarations.
Use ngDoBootstrap for intentional manual startup
If the application is designed to decide in code which component to start, implement ngDoBootstrap on the NgModule class instead of adding a conventional root-component array. Angular recognizes this lifecycle hook as the alternative to a nonempty bootstrap array.
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Choose this only when manual startup is part of the application’s design. Adding an arbitrary hook or placeholder component merely to silence NG0403 can hide a configuration mistake rather than fix it.
Check the module Angular actually starts
-
Find the call to
bootstrapModule(...)and note the exact module passed to it.Special offer. See more information about Outbyte and uninstall instructions. Please review EULA and Privacy policy.Rank #3
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-
Open that module’s
@NgModulemetadata. Confirm thatbootstrapcontains the intended root component, or that the module class implementsngDoBootstrap. -
If the component is listed but NG0403 persists, verify that you edited the same module passed to
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Confirm the application is running the expected entry point and build, rather than an older or different startup configuration.
Does fixing NG0403 require migrating away from NgModules?
No. The immediate fix for an existing NgModule application is to configure its root component or implement manual bootstrap. Separately, Angular’s current NgModules guide recommends bootstrapApplication instead of bootstrapModule for new code, while still documenting NgModules for understanding existing applications. Treat that as architectural guidance, not a required step to resolve NG0403.
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When an NgModule’s bootstrap array lists components, Angular locates matching host elements and renders those components there, as described in the NgModules guide. The API reference likewise identifies the array as the set of components bootstrapped when the module starts.
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