EPERM: operation not permitted, open
// Example of code with error: EPERM: operation not permitted, open try { // some code return res.download(`storage/${fileName}.${format}`); } catch (e) { return e; } finally { unlinkSync(`storage/${fileName}.${format}`); } // Example of code without any error: try { // some code return res.download(`storage/${fileName}.${format}`, function (err) { if (err) throw err; unlinkSync(`storage/${fileName}.${format}`); }); } catch (e) { return e; } // You can still try run the following commands in your terminal: npm install -g npm@latest --force npm update -g graceful-fs npm cache clean --force