A simple example how to load and to parse angular.json using @angular-devkit packages

readAngularWorkspaceDevKit.ts

import { workspaces, } from '@angular-devkit/core';
import { NodeJsSyncHost } from '@angular-devkit/core/node';
import { ProjectType } from '@schematics/angular/utility/workspace-models';

(async () => {
  const { workspace } = await workspaces.readWorkspace(
    process.cwd(),
    workspaces.createWorkspaceHost(new NodeJsSyncHost()),
  );

  for (const [name, project] of workspace.projects) {
    // How to know if it is a library of an application
    if (project.extensions.projectType === ProjectType.Application) {
      console.log(`Project ${name} is an application`);
    }

    if (project.extensions.projectType === ProjectType.Library) {
      console.log(`Project ${name} is a library`);

      // Get if application could target build/test/lint
      if (project.targets.has('build')) {
        console.log(`Project ${name} has build target`);
      }

      if (project.targets.has('test')) {
        console.log(`Project ${name} has test target`);
      }

      if (project.targets.has('lint')) {
        console.log(`Project ${name} has lint target`);
      }
    }

  }

})().catch(e => {
  // Deal with the fact the something goes wrong
  console.error(e);
});