AWS S3 is trying to downloading file when i get file

[tarikulker-js]

Hi guys! I'm a nodejs developer. I'm switched to Aws S3 from local file management. I have a issue about get file. Issue is when i trying to get file with GET request, browser is trying to download. I don't want it. I want is client just see file when send GET request to file, like that:

I'm checked the forums, documentation and aws-sdk codes! But still i have issue.

here are my codes:

Server.js File:

const express = require("express");
const app = express();

app.use("/:token?/files/public/:path/:file_path", (req, res) => {
    return downloadFileFromS3("my-bucket-name", `files/public/${req.params.path}/${req.params.file_path}`, res);
});

S3 File:

const AWS = require('aws-sdk');
const mime = require('mime');

const s3 = new AWS.S3({
accessKeyId: process.env.S3_ACCESS_KEY_ID.trim(),
secretAccessKey: process.env.S3_SECRET_ACCESS_KEY_ID.trim(),
region: process.env.S3_REGION.trim()
});

function downloadFileFromS3(bucketName, keyName, res) {
    const params = {
        Bucket: bucketName,
        Key: keyName,
        ResponseContentType: mime?.getType(keyName) || 'application/octet-stream',
    };

    s3.getObject(params, function (err, data) {
        if (err) {
            console.log(err);
            res.status(404).json({ error: 'file-not-found' });
            return
        }
        else {
            res.attachment(params.Key);
            res.contentType(data.ContentType);
            res.set({
                'Accept-Ranges': "bytes",
                'Content-Length': data.ContentLength,
            });
            res.send(data.Body);
            return
        }
    });
}