The endpoint did not return a Response.

EndpointDidNotReturnAResponse: An endpoint must return either a Response, or a Promise that resolves with a Response.

What went wrong?

Section titled What went wrong?

Thrown when an endpoint does not return anything or returns an object that is not a Response object.

An endpoint must return either a Response, or a Promise that resolves with a Response. For example:

import type { APIContext } from 'astro';

export async function GET({ request, url, cookies }: APIContext): Promise<Response> {
    return Response.json({
        success: true,
        result: 'Data from Astro Endpoint!'
    })
}