'how to prepare ReactJS to upload on online host?

so i have a webapp built with react in front and nodejs express in backend, i've changed localhost address from 'http://192.168.1.17:333/api/v1?name=test' to 'domain.com/api/v1/test?name=test' and in backend i've changed port to default like this:

app.listen(() => {
    console.log(`server is running`);
})

but when im gonna test my webapp it returns error like this in browser console:

xhr.js:210          POST domain.com/api/v1/test?name=testnet::ERR_FAILED 500

what should i do?

im using axios to post request btw.

node.jsreactjsexpressaxios


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