This depends on your actual backend architecture. Vercel does not support running servers (e.g. npm run start, node app.js, etc.), but you could use Express.js, for example.

You can learn more in these Articles:

• Why does npm run start not work on Vercel?
• Using Express.js with Vercel

Thanks for the reply.

Does that mean I can use axios like this const res = await axios.post('http://localhost:8383/lesson/lesson-run', sentData, { headers:{ 'Authorization': Bearer ${userData.acessToken} } })

and then process that request on the server side? My server side handles logins and the above example will fire a request to an external API and return it's response.