Getting Error in Console:Failed to Load Resource: Net::Err_Connection_Reset

Getting error in console : Failed to load resource: net::ERR_CONNECTION_RESET

I think you are using chrome.
The problem is the certificate mismatch or the expiration of the certificate.Check your certificate properly.

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Failed to load resource: net::ERR_CONNECTION_RESET And backend side Error: Illegal arguments: undefined, string

You appear to be posting the string "user" and not the object user from your incoming variable.

this:

return this.http.post('http://localhost:3000/users/register','user', {headers: headers})

should be this:

return this.http.post('http://localhost:3000/users/register', user, {headers: headers})

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