node.js - How to use facebook messenger send image API in Node js? -


i'm building facebook bot in nodejs facebook messenger api. i'm trying send image bot directly uploading image file heroku server (not through url) , not work.

here error log console.

failed calling send api 400 bad request { message: '(#100) incorrect number of files uploaded. must upload 1 file.',type: 'oauthexception', code: 100,error_subcode: 2018005,fbtrace_id: 'e32ogm/ofxd' }

the official facebook document contains example in curl format , i'dont know how replicate curl node format.

i've tested curl , worked charm. 

curl  \   -f 'recipient={"id":"recipientid"}' \   -f 'message={"attachment":{"type":"image", "payload":{}}}' \   -f 'filedata=@resource/pdf_img/sample.jpg;type=image/jpeg' \   "https://graph.facebook.com/v2.6/me/messages?access_token=page_access_token"

this node implementation seems problematic, 

//file_loc = __dirname+"/resource/pdf_img/sample.jpg" function sendimagemessage(recipientid, file_loc){     let fs = require('fs');     var readstream = fs.createreadstream(file_loc);     var messagedata = {         recipient : {             id : recipientid         },         message : {             attachment : {                 type : "image",                 payload :{}             }         },         filedata:readstream     }     callsendapi(messagedata); } function callsendapi(messagedata) {     request({         uri: "https://graph.facebook.com/v2.6/me/messages",         qs: {access_token: process.env.page_access_token},         method: "post",         json: messagedata     }, function(error, response, body) {         if (!error && response.statuscode == 200) {             var recipientid = body.recipient_id;             var messageid = body.message_id;              if (messageid) {                 console.log("successfully sent message id %s recipient %s",                      messageid, recipientid);             } else {                 console.log("successfully called send api recipient %s",                      recipientid);             }         } else {             console.error("failed calling send api", response.statuscode, response.statusmessage, body.error);         }     }); }

please fixing node implementation or translating curl in node appreciated.


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