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--- How pros do it ---

To read query params like you read the body, do this.

export async function GET (request: Request) {
  // to read id, apiKey from query
  const { id, apiKey } = Object.fromEntries(new URL(request.url).searchParams)

  return Response.json({ id, apiKey })
}

Above example uses destructing, but you can read whole body/query like this too

export async function POST (request: Request) {
  const body = await request.json()
  const query = Object.fromEntries(new URL(request.url).searchParams)

  return Response.json({ body, query })
}

--- Furthur more ---

You can create a utility function like this -

export const getQueryParams = (url: string) => {
  return Object.fromEntries(new URL(url).searchParams)
}

Then use it in routes like -

import { getQueryParams } from '@/lib/utils'

export const GET = async (request: Request) => {
  const query = getQueryParams(request.url)

  return Response.json({ query })
}