Express.js read and write image file All In One

Express.js read and write image file All In One

Node.js

https://nodejs.dev/en/learn/reading-files-with-nodejs/

https://nodejs.dev/en/learn/writing-files-with-nodejs/

docs

https://nodejs.org/en/docs

res.sendFile

res.sendFile(path [, options] [, fn])

res.sendFile() is supported by Express v4.8.0 onwards.

app.get('/file/:name', function (req, res, next) {
  const options = {
    root: path.join(__dirname, 'public'),
    dotfiles: 'deny',
    headers: {
      'x-timestamp': Date.now(),
      'x-sent': true
    }
  };

  const fileName = req.params.name;
  res.sendFile(fileName, options, function (err) {
    if (err) {
      next(err)
    } else {
      console.log('Sent:', fileName)
    }
  });
})

app.get('/user/:uid/photos/:file', function (req, res) {
  const uid = req.params.uid;
  const file = req.params.file;
  // check ❓
  req.user.mayViewFilesFrom(uid, function (yes) {
    if (yes) {
      res.sendFile('/uploads/' + uid + '/' + file)
    } else {
      res.status(403).send("Sorry! You can't see that.")
    }
  })
})

https://expressjs.com/en/api.html#res.sendFile

demos

Tesla price API

https://cyclic-express-server.cyclic.cloud/api/tesla

refs

https://stackoverflow.com/questions/17515699/node-express-sending-image-files-as-api-response

https://stackoverflow.com/questions/77244713/how-to-fetch-file-in-backend-using-nodejs

https://www.cnblogs.com/xgqfrms/p/17693872.html#5216883

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