How to send (large, huge, big) text file from server-side to client-side?

I'm developing a file-manager. (server-side: Express Server, client-side: Vue.js) The file upload part has been implemented. So I am implementing a preview of the contents of the text file.

The code on the server-side is as follows.

const readFile = require('fs').promises.readFile;

async getFile(dir, path) {
    try {
        return await readFile(dir + path, 'utf8');
    } catch (error) {
        console.log(error);
    }
}

router.get(`/url/:dirname/get`, async function (req, res, next) {
    const result = await getFile(req.params.dirname, req.query.path);
    return res.json(result);
});

When I call this, the client returns the "Out of Memory" message and terminates. The file is very big, how can I send the contents of this file to a client-side?

Thank you.