Reading png image from request using body-parser and Express












1














I am sending the following request to my server using postman:



enter image description here



I try to access the image in my application using the following code:



app.js



var express = require('express');
var bodyParser = require('body-parser');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();

app.use(bodyParser.raw({
type: 'image/png',
limit: '10mb'
}));

app.use('/', indexRouter);
app.use('/users', usersRouter);

module.exports = app;


index.js (router)



var express = require('express');
const router = express.Router();
var Jimp = require('jimp');

/* GET home page. */
router.get('/', function(req, res) {
res.render('index', { title: 'Express' });
});

router.post('/a', function(req, res) {
var image = req.body;

try{
Jimp.read(image, (err, input) => {
if (err) throw err;
input.sepia();

input.getBuffer(Jimp.AUTO, (err, output) => {
if(err) throw err;

res.writeHead(200, {'Content-Type': 'image/png' });
return res.end(output, 'binary');
});
});
}catch (err){
return res.status(400).send(`Error: ${err.message}`).end();
}
});

module.exports = router;


I was first using a form (with the help of express-fileupload library) to send the image and this worked fine, so I know the problem has to be somewhere before the line var image = req.body.
For the Jimp functions (image processing library) to work, the image has to be a buffer representing the png image.
When running console.log(image), the console outputs {}.



Can anybody show me a way to read the png as a buffer when it is sent as a Binary file?










share|improve this question



























    1














    I am sending the following request to my server using postman:



    enter image description here



    I try to access the image in my application using the following code:



    app.js



    var express = require('express');
    var bodyParser = require('body-parser');

    var indexRouter = require('./routes/index');
    var usersRouter = require('./routes/users');

    var app = express();

    app.use(bodyParser.raw({
    type: 'image/png',
    limit: '10mb'
    }));

    app.use('/', indexRouter);
    app.use('/users', usersRouter);

    module.exports = app;


    index.js (router)



    var express = require('express');
    const router = express.Router();
    var Jimp = require('jimp');

    /* GET home page. */
    router.get('/', function(req, res) {
    res.render('index', { title: 'Express' });
    });

    router.post('/a', function(req, res) {
    var image = req.body;

    try{
    Jimp.read(image, (err, input) => {
    if (err) throw err;
    input.sepia();

    input.getBuffer(Jimp.AUTO, (err, output) => {
    if(err) throw err;

    res.writeHead(200, {'Content-Type': 'image/png' });
    return res.end(output, 'binary');
    });
    });
    }catch (err){
    return res.status(400).send(`Error: ${err.message}`).end();
    }
    });

    module.exports = router;


    I was first using a form (with the help of express-fileupload library) to send the image and this worked fine, so I know the problem has to be somewhere before the line var image = req.body.
    For the Jimp functions (image processing library) to work, the image has to be a buffer representing the png image.
    When running console.log(image), the console outputs {}.



    Can anybody show me a way to read the png as a buffer when it is sent as a Binary file?










    share|improve this question

























      1












      1








      1







      I am sending the following request to my server using postman:



      enter image description here



      I try to access the image in my application using the following code:



      app.js



      var express = require('express');
      var bodyParser = require('body-parser');

      var indexRouter = require('./routes/index');
      var usersRouter = require('./routes/users');

      var app = express();

      app.use(bodyParser.raw({
      type: 'image/png',
      limit: '10mb'
      }));

      app.use('/', indexRouter);
      app.use('/users', usersRouter);

      module.exports = app;


      index.js (router)



      var express = require('express');
      const router = express.Router();
      var Jimp = require('jimp');

      /* GET home page. */
      router.get('/', function(req, res) {
      res.render('index', { title: 'Express' });
      });

      router.post('/a', function(req, res) {
      var image = req.body;

      try{
      Jimp.read(image, (err, input) => {
      if (err) throw err;
      input.sepia();

      input.getBuffer(Jimp.AUTO, (err, output) => {
      if(err) throw err;

      res.writeHead(200, {'Content-Type': 'image/png' });
      return res.end(output, 'binary');
      });
      });
      }catch (err){
      return res.status(400).send(`Error: ${err.message}`).end();
      }
      });

      module.exports = router;


      I was first using a form (with the help of express-fileupload library) to send the image and this worked fine, so I know the problem has to be somewhere before the line var image = req.body.
      For the Jimp functions (image processing library) to work, the image has to be a buffer representing the png image.
      When running console.log(image), the console outputs {}.



      Can anybody show me a way to read the png as a buffer when it is sent as a Binary file?










      share|improve this question













      I am sending the following request to my server using postman:



      enter image description here



      I try to access the image in my application using the following code:



      app.js



      var express = require('express');
      var bodyParser = require('body-parser');

      var indexRouter = require('./routes/index');
      var usersRouter = require('./routes/users');

      var app = express();

      app.use(bodyParser.raw({
      type: 'image/png',
      limit: '10mb'
      }));

      app.use('/', indexRouter);
      app.use('/users', usersRouter);

      module.exports = app;


      index.js (router)



      var express = require('express');
      const router = express.Router();
      var Jimp = require('jimp');

      /* GET home page. */
      router.get('/', function(req, res) {
      res.render('index', { title: 'Express' });
      });

      router.post('/a', function(req, res) {
      var image = req.body;

      try{
      Jimp.read(image, (err, input) => {
      if (err) throw err;
      input.sepia();

      input.getBuffer(Jimp.AUTO, (err, output) => {
      if(err) throw err;

      res.writeHead(200, {'Content-Type': 'image/png' });
      return res.end(output, 'binary');
      });
      });
      }catch (err){
      return res.status(400).send(`Error: ${err.message}`).end();
      }
      });

      module.exports = router;


      I was first using a form (with the help of express-fileupload library) to send the image and this worked fine, so I know the problem has to be somewhere before the line var image = req.body.
      For the Jimp functions (image processing library) to work, the image has to be a buffer representing the png image.
      When running console.log(image), the console outputs {}.



      Can anybody show me a way to read the png as a buffer when it is sent as a Binary file?







      node.js express post binary body-parser






      share|improve this question













      share|improve this question











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      asked Nov 21 '18 at 16:25









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      494




      494
























          2 Answers
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          0














          Nevermind, I just had to change the Content-Type header in my request to image/png -.-






          share|improve this answer





























            0














            can you rewrite function with lib multer?



            const multer  = require('multer')
            const storage = multer.memoryStorage()
            const upload = multer({ storage: storage })

            router.post('/a', upload.single('image'), function(req, res, next) {
            const image = req.file.buffer
            });


            or with formidable?



            var formidable = require('formidable' );

            router.post('/a', (req, res) => {
            const form = new formidable.IncomingForm();
            form.parse(req, (error, fields, files) => {
            const image = files.image;
            })
            });





            share|improve this answer





















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              2 Answers
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              active

              oldest

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              2 Answers
              2






              active

              oldest

              votes









              active

              oldest

              votes






              active

              oldest

              votes









              0














              Nevermind, I just had to change the Content-Type header in my request to image/png -.-






              share|improve this answer


























                0














                Nevermind, I just had to change the Content-Type header in my request to image/png -.-






                share|improve this answer
























                  0












                  0








                  0






                  Nevermind, I just had to change the Content-Type header in my request to image/png -.-






                  share|improve this answer












                  Nevermind, I just had to change the Content-Type header in my request to image/png -.-







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Nov 21 '18 at 16:56









                  Elias

                  494




                  494

























                      0














                      can you rewrite function with lib multer?



                      const multer  = require('multer')
                      const storage = multer.memoryStorage()
                      const upload = multer({ storage: storage })

                      router.post('/a', upload.single('image'), function(req, res, next) {
                      const image = req.file.buffer
                      });


                      or with formidable?



                      var formidable = require('formidable' );

                      router.post('/a', (req, res) => {
                      const form = new formidable.IncomingForm();
                      form.parse(req, (error, fields, files) => {
                      const image = files.image;
                      })
                      });





                      share|improve this answer


























                        0














                        can you rewrite function with lib multer?



                        const multer  = require('multer')
                        const storage = multer.memoryStorage()
                        const upload = multer({ storage: storage })

                        router.post('/a', upload.single('image'), function(req, res, next) {
                        const image = req.file.buffer
                        });


                        or with formidable?



                        var formidable = require('formidable' );

                        router.post('/a', (req, res) => {
                        const form = new formidable.IncomingForm();
                        form.parse(req, (error, fields, files) => {
                        const image = files.image;
                        })
                        });





                        share|improve this answer
























                          0












                          0








                          0






                          can you rewrite function with lib multer?



                          const multer  = require('multer')
                          const storage = multer.memoryStorage()
                          const upload = multer({ storage: storage })

                          router.post('/a', upload.single('image'), function(req, res, next) {
                          const image = req.file.buffer
                          });


                          or with formidable?



                          var formidable = require('formidable' );

                          router.post('/a', (req, res) => {
                          const form = new formidable.IncomingForm();
                          form.parse(req, (error, fields, files) => {
                          const image = files.image;
                          })
                          });





                          share|improve this answer












                          can you rewrite function with lib multer?



                          const multer  = require('multer')
                          const storage = multer.memoryStorage()
                          const upload = multer({ storage: storage })

                          router.post('/a', upload.single('image'), function(req, res, next) {
                          const image = req.file.buffer
                          });


                          or with formidable?



                          var formidable = require('formidable' );

                          router.post('/a', (req, res) => {
                          const form = new formidable.IncomingForm();
                          form.parse(req, (error, fields, files) => {
                          const image = files.image;
                          })
                          });






                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered Nov 21 '18 at 17:12









                          Jawlon Rodriguez

                          3811216




                          3811216






























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