This example shows how to supply custom headers for JSON Database. First, create the report designer with specified options and load report:

export class AppComponent {
	options: any;
	designer: any;

	ngOnInit() {
		console.log('Loading Designer view');

		console.log('Set full screen mode for the designer');    
		this.options = new Stimulsoft.Designer.StiDesignerOptions();
		this.options.appearance.fullScreenMode = false;

		console.log('Create the report designer with specified options');
		this.designer = new Stimulsoft.Designer.StiDesigner(this.options, 'StiDesigner', false);

		console.log('Edit report template in the designer');
		this.designer.report = new Stimulsoft.Report.StiReport();

...

Then, in onBeginProcessData event handler add custom HTTP headers:

...

	// In `onBeginProcessData` event handler add custom HTTP headers
	this.designer.report.onBeginProcessData = (args: any) => {
		if (
			args.database === "JSON" && 
			args.command === "GetData" && 
			args.pathData && args.pathData.endsWith("/ProtectedDemo.json")
		) {
			// Add custom header to pass through backend server protection
			args.headers.push({key: "X-Auth-Token", value: "*YOUR TOKEN*"});
		}
	};
	
...

Finally, load report from URL and render it:

...

		console.log('Load report from url');
		this.designer.report.loadFile('/reports/SimpleListWithProtectedJson.mrt');

		console.log('Rendering the designer to selected element');
		this.designer.renderHtml('designer');

		console.log('Loading completed successfully!');
	}

	constructor() {
	}
}

In the screenshot below you can see the result of the sample code: