Troubleshoot: Issues in Retrieving Query Parameter from URL within Next.js API Route

Currently, I am working on a project using Next.js (version 14) that involves implementing a product search feature. The search functionality is managed by a Search component, and the key code snippet is shown below:

// Search component in Search.tsx
"use client";

import { useSearchParams, usePathname, useRouter } from "next/navigation";
import { useDebouncedCallback } from 'use-debounce';

export default function Search({ placeholder }: { placeholder: string }) {
  const searchParams = useSearchParams();
  const pathname = usePathname();
  const { replace } = useRouter();

  const handleSearch = useDebouncedCallback((term) => {
    const params = new URLSearchParams(searchParams || '');
    if (term) {
      params.set('q', term);
    } else {
      params.delete('q');
    }
    replace(`${pathname}?${params.toString()}`);
  }, 300);
  
  return (
    <div className="relative">
      <input
        className="peer block mt-0 w-full rounded-md border border-gray-200 py-[9px] pr-10 text-sm outline-2 placeholder:text-gray-500"
        placeholder={placeholder}
        onChange={(e) => {
          handleSearch(e.target.value);
        }}
        defaultValue={searchParams?.get('q')?.toString()}
      />
    </div>
  );
}

In the GET handler within my API route (app/api/products/route.ts), I am attempting to retrieve the query parameter from the URL as follows:

// app/api/products/route.ts
import { NextRequest, NextResponse } from "next/server";

export const GET = async (req: NextRequest) => {
  const { searchParams } = req.nextUrl;
  const query = searchParams.get("q");
  console.log(query);

  return NextResponse.json({ query });
};

However, despite updating the URL correctly to /products?q=test+search+product when testing with the input "test search product," the query parameter in the response always returns as null instead of "test search product" as expected. I intend to utilize this query parameter for fetching data from the API with Prisma. Any insights or suggestions on resolving this issue would be greatly appreciated. Thank you!

Answer №1

It's important to ensure that the file structure is accurate in order for dynamic routes in Next.js to function properly. The file structure must adhere to the expected naming conventions:

app/
└── api/
    └── queries/
        └── [id]/
            └── route.ts

The use of "[id]" denotes a dynamic route parameter.

For example, if you have the API URL /api/queries/123, the value 123 would be stored in params.id. In this scenario, the [id] tag serves as your search parameter.

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