namae/api/services/playstore/[query].ts

import { send, sendError, fetch } from '../../../util/http';
import { NowRequest, NowResponse } from '@vercel/node';

export default async function handler(
  req: NowRequest,
  res: NowResponse
): Promise<void> {
  const { query } = req.query;

  if (!query || typeof query !== 'string') {
    return sendError(res, new Error('No query given'));
  }

  try {
    const responseText = await fetch(
      `https://play.google.com/store/search?c=apps&q=${encodeURIComponent(
        query
      )}`,
      'GET'
    ).then((res) => res.text());
    const response = JSON.parse(
      responseText.match(
        /AF_initDataCallback.+?hash: '5'.+?data:([\w\W]+?), sideChannel/m
      )[1]
    );
    const apps = response[0][1][0][0][0].map((entry) => ({
      id: entry[12][0],
      name: entry[2],
      author: entry[4][0][0][0],
      rating: entry[6][0][2][1][1],
      url: 'https://play.google.com' + entry[9][4][2],
    }));
    send(res, { result: apps.slice(0, 10) });
  } catch (err) {
    sendError(res, err);
  }
}