The error is pretty clear, you need to specify an absolute (instead of relative) path and/or set root in the config object for res.sendFile(). Examples:
// assuming index.html is in the same directory as this script res.sendFile(__dirname + '/index.html');
or specify a root (which is used as the base path for the first argument to res.sendFile():
res.sendFile('index.html', { root: __dirname });
Specifying the root path is more useful when you’re passing a user-generated file path which could potentially contain malformed/malicious parts like .. (e.g. ../../../../../../etc/passwd). Setting the root path prevents such malicious paths from being used to access files outside of that base path.
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