Next.js App Router - Backend caption route in the Remotion Editor Starter (https://remotion.dev/docs/editor-starter/backend-routes)

route.ts

// src/app/api/font/[name]/route.ts
// Font loading and management

import {NextRequest, NextResponse} from 'next/server';
import {GOOGLE_FONTS_DATABASE} from '@/editor/data/google-fonts';

interface RouteParams {
	params: {
		name: string;
	};
}

export async function GET(request: NextRequest, {params}: RouteParams) {
	const { name } = await params

	const entry = GOOGLE_FONTS_DATABASE.find(
		(font) => font.fontFamily === name,
	);

	if (!entry) {
		return new NextResponse('Font not found', {
			status: 404,
		});
	}

	return NextResponse.json(entry, {
		status: 200,
		headers: {'Content-Type': 'application/json'},
	});
}