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if (err instanceof AuthenticationError) {
return res.status(401).send('not authenticated');
if (err instanceof UnauthorizedError) {
return res.status(403).send('forbidden');
if (err instanceof InvalidInputError) {
return res.status(400).send('bad request');
if (err instanceof DuplicateKeyError) {
return res.status(409).send('conflict. entity already exists');
// Generic error
return res.status(500).send('internal error occurred')
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