Readme.md

So far I believe this is the best way to upload files from RN to node.js server. Seems very stable.

uploadFileRNtoNodeJs

/** React Native part */
var FileUpload = require('NativeModules').FileUpload;

_saveFile() {
      var data = {
          validity: this.state.value,
          text: this.state.message,
          location: this.props.location,
          user: {
              id: this.props.user._id,
              username: this.props.user.username
          }
      };

      var obj = {
          uploadUrl: '/files',
          method: 'POST', // default 'POST',support 'POST' and 'PUT'
          headers: {
              'Accept': 'application/json',
          },
          fields: data,
          files: [
              {
                  filename: 'test_file', // require, file name
                  filepath: file.uri, // require, file absoluete path
              },
          ]
      };
      FileUpload.upload(obj, function (err, result) {
          console.log('upload:', err, result);
      });
}

/** node.js part */
var multipart = require('connect-multiparty'); 
var multipartMiddleware = multipart(); 
 
router.post('/files', multipartMiddleware, function(req, resp) { 
      console.log(req.body); 
      console.log(req.files); 
      // don't forget to delete all req.files when done 
}); 

npm install connect-multiparty