Set headers in ExpressJs app to return a file buffer
Posted on October 10, 2021
If you want to return a file from an API request in an Express.js app, here the settings:
app.get('/', (req, res) => {
// ... create the buffer of a PDF, PNG or ZIP
const filename = 'myFile.pdf' // myFile.png or myFile.zip
const mimeType = 'application/pdf' // 'image/png' or 'application/zip'
res.setHeader('Content-Disposition', 'attachment;filename="' + filename)
res.setHeader('Content-Type', mimeType)
res.send(buffer)
})