How can I make AJAX requests using the Express framework? - javascript

I want to send AJAX requests using Express. I am running code that looks like the following:
var express = require('express');
var app = express();
app.get('/', function(req, res) {
// here I would like to make an external
// request to another server
});
app.listen(3000);
How would I do this?

You can use request library
var request = require('request');
request('http://localhost:6000', function (error, response, body) {
if (!error && response.statusCode == 200) {
console.log(body) // Print the body of response.
}
})

You don't need Express to make an outgoing HTTP request. Use the native module for that:
var http = require('http');
var options = {
host: 'example.com',
port: '80',
path: '/path',
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
'Content-Length': post_data.length
}
};
var req = http.request(options, function(res) {
// response is here
});
// write the request parameters
req.write('post=data&is=specified&like=this');
req.end();

Since you are simply making a get request I suggest this
https://nodejs.org/api/http.html#http_http_get_options_callback
var http = require('http');
http.get("http://www.google.com/index.html", function(res) {
console.log("Got response: " + res.statusCode);
if(res.statusCode == 200) {
console.log("Got value: " + res.statusMessage);
}
}).on('error', function(e) {
console.log("Got error: " + e.message);
});
That code is from that link

Related

while sending data through post request using request module in nodejs got error

var http = require('http');
var querystring = require('querystring');
var request = require('request');
var postData = querystring.stringify({
msg: 'hello world'
});
var request = require('req')
var options = {
hostname: 'localhost',
port: 8000,
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
'Content-Length': postData.length
}
};
var req = http.request(options, function(res) {
console.log('STATUS:', res.statusCode);
console.log('HEADERS:', JSON.stringify(res.headers));
res.setEncoding('utf8');
res.on('data', function(chunk) {
console.log('BODY:', chunk);
});
res.on('end', function() {
console.log('No more data in response.');
});
});
when i run this code I am getting cannot find 'req' module .I could see all the modules are properly installed in package.json and i did npm install too.Is there any problem in the code ?
Get rid of this line: var request = require('req')
You need to delete var request = require('req');

node.js http and bing search api

I am trying to use the Bing Search API to return a JSON string. I first tried using the following url as per Azure's explore website (https://datamarket.azure.com/dataset/explore/5BA839F1-12CE-4CCE-BF57-A49D98D29A44):
'https://api.datamarket.azure.com/Bing/Search/v1/Composite?Sources=%27web%27&Query=%27NGI%20SPA%27&Market=%27en-US%27'
After, I found a SO thread Using the new Bing API (nodejs) which suggested I use a url of the form:
https://user:<YourDefaultAccountKey>#api.datamarket.azure.com/Bing/SearchWeb/Web?Query=%27leo%20fender%27&Market=%27en-US%27&$top=50&$format=JSON
Both of these return status 401 (Authentication Failure):
STATUS: 401
HEADERS: {"content-type":"application/json; charset=utf-8","server":"Microsoft-IIS/8.0","jsonerror":"true","x-powered-by":"ASP.NET","access-control-allow-origin":"*","access-control-allow-credentials":"false","access-control-allow-headers":"Authorization, DataServiceVersion, MaxDataServiceVersion","access-control-expose-headers":"DataServiceVersion, MaxDataServiceVersion","access-control-allow-methods":"GET, POST, OPTIONS","access-control-max-age":"604800","date":"Wed, 02 Jul 2014 17:23:29 GMT","content-length":"91"}
BODY: {"Message":"There was an error processing the request.","StackTrace":"","ExceptionType":""}
I have also tried other various combinations of URLs to no avail. My code is below:
var url = require('url');
var http = require('http');
var serviceRootURL = 'https://api.datamarket.azure.com/Bing/Search/v1/Composite?Sources=%27web%27&Query=%27NGI%20SPA%27&Market=%27en-US%27'
var params = 'hi';
var dataURL = url.parse(serviceRootURL);
var post_options = {
hostname: dataURL.hostname,
port: dataURL.port || 80,
path: dataURL.path,
method: 'GET',
headers: {
'Content-Type': 'application/json; charset=utf-8',
'Content-Length': params.length
}
};
var req = http.request(post_options, function(res) {
console.log('STATUS: ' + res.statusCode);
console.log('HEADERS: ' + JSON.stringify(res.headers));
res.setEncoding('utf8');
res.on('data', function (chunk) {
console.log('BODY: ' + chunk);
});
});
req.on('error', function(e) {
console.log('problem with request: ' + e.message);
});
// write data to request body
req.write('data\n');
req.write('data\n');
req.end();
Any idea why I am getting an authentication failure?
You can use this module that encapsulates the requests, so you can use it
like:
var Bing = require('node-bing-api')({ accKey: "your-account-key" });
Bing.web("leo fender", function(error, res, body){
console.log(body);
},
{
top: 50,
market: 'en-US'
});
It works with the Azure version. You only have to replace your account key.
Got it working with request...weird
var request = require('request');
var _ = require('underscore');
var searchURL = 'https://user:<TIPE YOUR KEE HEER>#api.datamarket.azure.com/Bing/SearchWeb/v1/Web?Query=%27xbox%27&$top=10&$format=JSON';
var http = request( searchURL, function(err, resp, body)
{
if ( err )
{
throw err;
}
var a = JSON.parse(body);
console.log(a.d.results);
});
you can use jsearch module. install ;
npm install jsearch
usage;
js.bing('queryStringYouWant',10,function(response){
console.log(response) // for Bing results
})

Express.js proxy post request

I reviewed request module for node https://github.com/mikeal/request
But can't figure out how to proxy POST request to remote server, example
app.post('/items', function(req, res){
var options = {
host: 'https://remotedomain.com',
path: '/api/items/,
port: 80
};
var ret = res;
http.get(options, function(res){
var data = '';
res.on('data', function(chunk){
data += chunk;
});
res.on('end', function(){
var obj = JSON.parse(data);
ret.json({obj: obj});
console.log('end');
});
});
});
Unless I am missing something from your question, you can just do a simple post, and then do something with the response data:
var request = require('request');
app.post('/items', function(req, res){
request.post('https://remotedomain.com/api/items', function (error, response, body) {
if (!error && response.statusCode == 200) {
console.log(body); // Print the body of the response. If it's not there, check the response obj
//do all your magical stuff here
}
})

How to pass response paramaters including body from POST http.request in NodeJS

I am trying to write a basic REST Post client to work with node.js and because of the REST API I have to work with I have to get details from the responses including cookies to maintain the state of my REST session with the server. My Question is what is the best way to pull the json objects from the response when res.on triggers with all the data in the PRINTME variable and return it to the test.js console.log().
test.js file
var rest = require('./rest');
rest.request('http','google.com','/upload','data\n');
console.log('PRINTME='JSON.stringify(res.PRINTME));
rest.js module
exports.request = function (protocol, host, path, data, cookie){
var protocalTypes = {
http: {
module: require('http')
, port: '80'
}
, https: {
module: require('https')
, port: '443'
}
};
var protocolModule = protocalTypes[protocol].module;
var options = {
host: host,
port: protocalTypes[protocol].port,
path: path,
method: 'POST',
headers: {
'Content-Type': 'text/xml'
, 'Content-Length': Buffer.byteLength(data)
, 'Cookie': cookie||''
}
};
console.log('cookies sent= '+options.headers.Cookie)
var req = protocolModule.request(options, function(res) {
var PRINTME = res;
console.log('STATUS: ' + res.statusCode);
console.log('HEADERS: ' + JSON.stringify(res.headers));
res.setEncoding('utf8');
res.on('data', function (chunk) {
PRINTME.body = chunk;
console.log('BODY: ' + chunk);
});
res.on('close', function () {res.emit('end')});
});
req.on('error', function(e) {
console.error('Request Failure: ' + e.message);
});
req.write(data);
req.end();
};
Using a package like request will help you simplify your code.
The following would be rest.js
var request = require('request');
module.exports = function(protocol, host, path, data, cookie, done) {
var options = {
host: host,
port: protocalTypes[protocol].port,
path: path,
method: 'POST',
headers: {
'Content-Type': 'text/xml',
'Content-Length': Buffer.byteLength(data)
},
jar: true
};
request(options, function(err, resp, body) {
if (err) return done(err);
// call done, with first value being null to specify no errors occured
return done(null, resp, body);
});
}
Setting jar to true will remember cookies for future use.
See this link for more information on the available options
https://github.com/mikeal/request#requestoptions-callback
To use this function in another file
var rest = require('./rest');
rest(... , function(err, resp, body){
...
});

In Node.js / Express, how do I "download" a page and gets its HTML?

Inside the code, I want to download "http://www.google.com" and store it in a string.
I know how to do that in urllib in python. But how do you do it in Node.JS + Express?
var util = require("util"),
http = require("http");
var options = {
host: "www.google.com",
port: 80,
path: "/"
};
var content = "";
var req = http.request(options, function(res) {
res.setEncoding("utf8");
res.on("data", function (chunk) {
content += chunk;
});
res.on("end", function () {
util.log(content);
});
});
req.end();
Using node.js you can just use the http.request method
http://nodejs.org/docs/v0.4.7/api/all.html#http.request
This method is built into node you just need to require http.
If you just want to do a GET, then you can use http.get
http://nodejs.org/docs/v0.4.7/api/all.html#http.get
var options = {
host: 'www.google.com',
port: 80,
path: '/index.html'
};
http.get(options, function(res) {
console.log("Got response: " + res.statusCode);
}).on('error', function(e) {
console.log("Got error: " + e.message);
});
(Example from node.js docs)
You could also use mikeal's request module
https://github.com/mikeal/request
Simple short and efficient code :)
var request = require("request");
request(
{ uri: "http://www.sitepoint.com" },
function(error, response, body) {
console.log(body);
}
);
doc link : https://github.com/request/request
Yo can try with axios
var axios = require('axios');
axios.get("http://www.sitepoint.com", {
headers: {
Referer: 'http://www.sitepoint.com',
'X-Requested-With': 'XMLHttpRequest'
}
}).then(function (response) {
console.log(response.data);
});

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