How to get query param from request in API Route handler?

Question

I'd like get query params from request in API call. How can I retreive it in server side?

import prisma from "@/app/lib/prisma";

import { NextApiRequest, NextApiResponse } from 'next'
import { Context } from "vm";

export async function getServerSideProps(ctx: Context) {
    const { igenykod } = ctx.params;
    return {
        props: {
            igenykod
        },
    };
};

export async function GET(
    req: NextApiRequest,
    res: NextApiResponse
) {
    const kod = req.query.igenykod as string
    const igenystatusz = await prisma.igenystatusz.findMany({
        where: {
            igenykod: "CK1"
        }
    });
    return new Response(JSON.stringify(igenystatusz));

}

In this code req.query is undefined. I readed about getServerSideProps but I dont want to make page for request. Can I make as simply as ExpressJS routing?

Answer 1

In the app directory (router), you can get query strings (aka the ?search=value) in an API route this way:

import { NextRequest, NextResponse } from "next/server";

export async function GET(req: NextRequest) {
  const { searchParams } = new URL(req.url);
  console.log(searchParams.get("igenykod"));
  return new Response("...");
}

The API route handler only gets passed only the request, and its type is NextRequest not NextApiRequest which is for the pages router (only where getServerSideProps works).