Custom function not working

const sdk = require('node-appwrite');

module.exports = async function (req, res) {
    const client = new sdk.Client();
    const database = new sdk.Databases(client);

    client
    .setEndpoint('temp')
    .setProject('temp');

    try {
        const response = await database.listDocuments('temp',
        'temp');
    
        return res.json({
          myResponse: response,
        });
      } catch (error) {
        console.log(error.toString());
        return res.json({
          myError: error.toString(),
          endPoint: req.variables["APPWRITE_FUNCTION_ENDPOINT"],
          projectId: req.variables["APPWRITE_FUNCTION_PROJECT_ID"],
          functionApi: req.variables["APPWRITE_FUNCTION_API_KEY"],
        });
      }
}