To create an Angular component with a subcomponent, you can follow these steps:

Step 1: Generate the Main Component Use Angular CLI to generate the main component using the following command in your terminal or command prompt:

ng generate component main-component

This will create a folder for your main component with the necessary files including the TypeScript component file, HTML template file, CSS file (if applicable), and a test file.

Step 2: Generate the Subcomponent Similarly, use Angular CLI to generate the subcomponent within the main component's folder using the following command:

ng generate component main-component/sub-component

Replace "sub-component with the name you want to give to your subcomponent. This will create a folder for the subcomponent within the main component's folder with the necessary files.

Step 3: Add Subcomponent to Main Component In the TypeScript file of the main component (main-component.ts), you can import the subcomponent and add it to the declarations array in the @ decorator:

import { SubComponentComponent } from './sub-component/sub-component.component';

@Component({
  selector: 'app-main-component',
  templateUrl: './main-component.component.html',
  styleUrls: ['./main-component.component.css'],
  declarations: [SubComponentComponent]
})

Step 4: Use Subcomponent in Main's Template In the HTML template file of the main component (main-component.component.html), you can use the subcomponent's selector to include it in the main component's template:

<div>
  <p>Main Component Content</p>
  <app-sub-component></app-sub-component>
</div>

By following these steps, you can create an Angular component with a subcomponent. Remember to adjust the file and folder names according to your project's specific requirements.

To read a configuration JSON file and create an Angular component based on that, you can follow these general steps:

Step 1: Create Configuration JSON File Create a configuration JSON file (e.g., config.json) in the assets folder of your Angular project. This file will contain the configuration data that will be used to generate the component.

Example of config.json:

{
  "componentTitle": "Sample Component",
  "fields": [
    {
      "name": "fieldName1",
      "type": "text",
      "label": "Field 1"
    },
    {
      "name": "fieldName2",
      "type": "number",
      "label": "Field 2"
    }
  ]
}

Step2: Create a Service to Fetch Configuration Create a service in Angular to fetch the configuration JSON file using HttpClient from '@angular/common/http'. Define a method in the service to fetch the configuration data from the JSON file.

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class ConfigurationService {
  constructor(private http: HttpClient) }

  getConfig(): Observable<any> {
    return this.http.get('assets/config.json');
  }
}

Step 3: Create a Dynamic Component Create a dynamic Angular component that will be generated based on the configuration data. Use the configuration fetched from the JSON file to dynamically create the component structure.

Step 4: Generate Component Based on Configuration In your Angular component, use the ConfigurationService to fetch the configuration data from the JSON file. Once the data is fetched, dynamically generate the component based on the configuration. can use's ComponentFactoryResolver to dynamically create components.

Here is a simplified example of how you might generate a component based on the fetched configuration:

import { Component, ViewChild, ViewContainerRef, ComponentFactoryResolver, OnInit } from '@angular/core';
import { ConfigurationService } from 'path-to-your-configuration-service';

@Component({
  selector: 'app-configurable-component',
  template: `<div #dynamicComponentContainer></div>`
})
export class ConfigurableComponent implements OnInit {
  @ViewChild('dynamicComponentContainer', { read: ViewContainerRef }) dynamicComponentContainer: ViewContainerRef;

  constructor(private configurationService: ConfigurationService, private componentFactoryResolver: ComponentFactoryResolver) { }

  ngOnInit() {
    this.configurationService.getConfig().subscribe(config => {
      // Create component based on the config
      const componentFactory = this.componentFactoryResolver.resolveComponentFactory(DynamicComponent); // Replace DynamicComponent with your dynamically generated component
      const componentRef = this.dynamicComponentContainer.createComponent(componentFactory);
      componentRef.instance.config = config; // Pass the fetched configuration to the dynamic component
    });
  }
}

In this example, we assume that you have created a separate DynamicComponent that will be generated based on the configuration data.

Please note that dynamically generating components based on configuration can be a more complex task, and the above example provides a simplified overview. It's important to handle security considerations and thoroughly test the dynamic component generation process.