Working

.jshintrc

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+{
+    "esversion": 6
+}

index.js

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+let jsforce = require('jsforce');
+let conn = new jsforce.Connection({
+    // you can change loginUrl to connect to sandbox or prerelease env.
+    // loginUrl : 'https://test.salesforce.com'
+});
+
+let username = 'api@dotnetbuild.com';
+let password = 'p4uPgFg7VaTMGzLT';
+let fullName = 'my_connected_app7';
+
+conn.login(username, password, function (err, userInfo) {
+    if (err) {
+        return console.error(err);
+    }
+
+    let metadata = [{
+        contactEmail: 'wade.wegner@gmail.com',
+        description: 'my connected app 7',
+        fullName: fullName,
+        label: 'ConnectedAppLabel7',
+        oauthConfig: {
+            callbackUrl: 'sfdx://success',
+            consumerSecret: '3256A12TT',
+            scopes: [
+                'Basic',
+                'Api',
+                'Web',
+                'Full',
+                'RefreshToken'
+            ]
+        }
+    }];
+
+    conn.metadata.create('ConnectedApp', metadata, function (err, results) {
+        if (err) {
+            console.log(err);
+            return;
+        }
+
+        conn.metadata.read('ConnectedApp', fullName, function (err, metadata) {
+            if (err) {
+                console.log(err);
+                return;
+            }
+
+            console.log('consumer key: ' + metadata.oauthConfig.consumerKey);
+        });
+    });
+
+
+});

package.json

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+{
+  "name": "connected-app-nodejs",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "jsforce": "^1.7.1",
+    "libxmljs": "^0.18.0"
+  }
+}

post.js

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+var http = require('http');
+var libxml = require("libxmljs");
+
+var body = 
+    '<soapenv:Envelope xmlns:xsd="http://www.w3.org/2001/XMLSchema"' +
+    '    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ' +
+    '    xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" ' +
+    '    xmlns:cmd="http://soap.sforce.com/2006/04/metadata" ' +
+    '    xmlns:apex="http://soap.sforce.com/2006/08/apex">' +
+    '	<soapenv:Header>' +
+    '		<cmd:SessionHeader>' +
+    '			<cmd:sessionId>00DF00000008H5t!ARgAQONqPATVL3emKy5EaUdqjg.Fwd_RFBoik.SlwoP7XZVCq7Heqlj1sYfI9AAPJZPXOIJoCAaoK9NQaHxlmBZpv6hnx95M</cmd:sessionId>' +
+    '		</cmd:SessionHeader>' +
+    '	</soapenv:Header>' +
+    '	<soapenv:Body>' +
+    '		<create xmlns="http://soap.sforce.com/2006/04/metadata">' +
+    '			<metadata xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="ConnectedApp">' +
+    '			    <contactEmail>wade.wegner@gmail.com</contactEmail>' +
+    '			    <version>29.0</version>' +
+    '			    <description>my connected app</description>' +
+    '			    <label>myconnectedapp</label>' +
+    '			    <oauthConfig>' +
+    '			        <callbackUrl>sfdx://success</callbackUrl>' +
+    '			        <consumerSecret>3256A12TT</consumerSecret>' +
+    '			        <scopes>Api</scopes>' +
+    '			        <scopes>Web</scopes>' +
+    '			        <scopes>Full</scopes>' +
+    '			        <scopes>RefreshToken</scopes>' +
+    '			    </oauthConfig>' +
+    '			</metadata>' +
+    '		</create>' +
+    '	</soapenv:Body>' +
+    '</soapenv:Envelope>';
+
+var xmlDoc = libxml.parseXmlString(body, { noblanks: true });
+console.log(xmlDoc.toString());
+var xml = xmlDoc.toString();
+
+// console.log(body);
+
+var postRequest = {
+    host: 'na42.salesforce.com',
+    path: '/services/Soap/m/29.0/00DF00000008H5t',
+    port: 443,
+    method: 'POST',
+    headers: {
+        'Content-Type': 'text/xml',
+        'SOAPAction': 'create'
+    }
+};
+
+var req = http.request( postRequest, function( res )    {
+
+   console.log( res.statusCode );
+   var buffer = "";
+   res.on( "data", function( data ) { buffer = buffer + data; } );
+   res.on( "end", function( data ) { console.log( buffer ); } );
+
+});
+
+req.on('error', function(e) {
+    console.log('problem with request: ' + e.message);
+});
+
+req.write( xml );
+req.end();