Resolver Emitting Error ` ERROR Error: "[object Object]" `

I have found solution for detailed error working in firefox. Its based on defining custom error handler and inspecting error properties yourself. After these steps, the errors were displayed properly, no need to switch to chrome.

1. Define custom error handler class:

import { ErrorHandler } from '@angular/core'

export class MyErrorHandler implements ErrorHandler {

    handleError(error: any) {
        // console.error(Object.getOwnPropertyNames(error))
        // Object.getOwnPropertyNames(error).forEach(p => console.error(error[p]))
        console.error(error.fileName, error.lineNumber, ':', error.columnNumber, '\n', error.message, error.rejection)
    }

}

2. Then register it as provider in main component

@NgModule({
    declarations: []
    imports: []
    providers: [{provide: ErrorHandler, useClass: MyErrorHandler}], // <-- register MyErrorHandler
    bootstrap: [RootComponent]
})
export class AppModule { }

This lack of detailed error occurred when using Mozilla Firefox. so what you need to do is to switch over to Google Chrome to see the specific error.

UPDATED:

You can also Store the error as Global Variable

then you can type temp0.message to see the actual error message

In console you can store errors like

ERROR Error: "[object Object]"

as global variable

and then get error message from object temp0.message