我创建了一个这样的minio客户端：

endPoint: process.env.END_POINT,
  port: parseInt(process.env.PORT),
  useSSL: false,
  accessKey: process.env.ACCESS_KEY,
  secretKey: process.env.SECRET_KEY,
});

但是以这种方式使用环境变量无法连接到minio bucket。相反，如果我使用硬编码的值，客户端将成功创建。
有没有什么方法可以使用环境变量或其他方法来保证凭证的安全？
我使用minio的相关代码：

const filePath = req.file.path;
      const metaData = {
        "Content-Type": req.file.mimetype,
      };

      const bucketName = "abc";
      const objectName = req.file.originalname;

      minioClient.fPutObject(
        bucketName,objectName,filePath,metaData,
        async (err, etag) => {
          if (err) {
            console.log("Error uploading image:", err);
            return res.status(500).send("Error uploading the image.");
          }

          console.log("Image uploaded successfully: ", objectName);

          const username = req.user.username;
          const newPost = new Post({
            content: req.body.content,
            image: "http://localhost:9000/abc/" + objectName,
            username: username,
          });

const savedPost = await newPost.save();