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up vote 64 down vote favorite
21

Can we get the variables in query string in node.js just like we get in $_GET in PHP?

I know that in node.js we can get the url in request. Is there any method to get query string parameters?

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8 Answers

up vote 52 down vote accepted

Yes you can:

var url = require('url');
var url_parts = url.parse(request.url, true);
var query = url_parts.query;
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7  
To get access to url there, one must require("url"). – juanpaco Feb 8 at 14:23
1  
Fixed in the response – Marcus Granström Mar 4 at 7:51
up vote 148 down vote

Since you've mentioned Express.js in your tags, here is an Express-specific answer: use req.query. E.g.

var app = require('express').createServer();

app.get('/', function(req, res){
  res.send('id: ' + req.query["id"]);
});

app.listen(3000);
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11  
Worth mentioning that you should use req.query.id, no need to use bracket notation. – alex Feb 28 at 5:40
up vote 43 down vote

In Express, use req.query.

req.params only gets the route parameters, not the query string parameters. See the express documentation:

(req.params) Checks route params, ex: /user/:id

(req.query) Checks query string params, ex: ?id=12 Checks urlencoded body params

(req.body), ex: id=12 To utilize urlencoded request bodies, req.body should be an object. This can be done by using the _express.bodyParser middleware.

That said, most of the time, you want to get the value of a parameter irrespective of its source. In that case, use:

req.param('foo')

The value of the parameter will be returned whether the variable was in the route parameters, query string, or the encoded request body.

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5  
This answered the question imo – matejkramny Jun 25 '12 at 21:30
1  
Agreed although he didn't specify express in the question, he tagged it as express and this is the simplest answer. – Andrew Plummer Aug 1 '12 at 1:37
1  
this covers more than the accepted answer, upvoted. – Vicary Mar 28 at 18:14
up vote 33 down vote

for expressJs you want to do req.params:

app.get('/user/:id', function(req, res) {
  res.send('user' + req.params.id);

});
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3  
to retrieve GET variables in express.js you can use req.query. – Andy Dec 16 '11 at 8:40
3  
@Andy req.params is better because: req.param(name[, default]) will: Return the value of param name when present or default. Checks route params (req.params), ex: /user/:id Checks query string params (req.query), ex: ?id=12Checks urlencoded body params (req.body), ex: id=12 To utilize urlencoded request bodies, req.body should be an object. This can be done by using the _express.bodyParser middleware. – Cris-O Dec 18 '11 at 23:19
I didn't know req.param checks for req.query, thanks for this note. – Andy Dec 19 '11 at 11:14
2  
req.param('parameterName') will check for req.body, req.query, and req.params, but if you want all of the query parameters as an object, you should use req.query. – mikermcneil Feb 11 '12 at 18:51
@mikermcneil you probably mixed up req.param() and req.params (object). According to expressjs docs req.param() looks for value in all three objects. expressjs.com/api.html#req.param – Andy May 2 at 6:48
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up vote 10 down vote

You should be able to do something like this:

var http = require('http');
var url  = require('url');

http.createServer(function(Request,Response){
    var url_parts = url.parse(Request.url, true);
    var query = url_parts.query;

    console.log(query); //{Object}

    Response.end("End")
})
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up vote 7 down vote

I learned from above posts and decided to use this code throughout my site

var query = require('url').parse(req.url,true).query;

then you can just call 

var id=query.id;
var option=query.option;

where the url for get should be

/path/filename?id=123&option=456
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up vote 3 down vote

An old question, but since I've stumbled into it as top result when searching for something similar, here are my two cents.

A small nodejs http server listening on port 9080, parsing GET or POST data and sending it back to the client as part of the response. 

var sys = require ('sys'),
url = require('url'),
http = require('http'),
qs = require('querystring');

var server=http.createServer(

function (request, response) {

    if(request.method=='POST') {
            var body='';
            request.on('data', function (data) {
                body +=data;
            });
            request.on('end',function(){

                var POST =  qs.parse(body);
                //console.log(POST);
                response.writeHead( 200 );
                response.write( JSON.stringify( POST ) );
                response.end();                 
            });
    }
    else if(request.method=='GET') {

        var url_parts = url.parse(request.url,true);
        //console.log(url_parts.query);
        response.writeHead( 200 );
        response.write( JSON.stringify( url_parts.query ) );
        response.end();
    }               
}
);

server.listen( 9080 );

Save it as parse.js and run it on the console by entering "node parse.js"

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up vote 2 down vote

Piece of working code:

(I'm sure it will help)

app.js

var express = require('express');
var app = express();
app.use(express.bodyParser()); // Required for parsing POST

app.get('/', function(req, res){
    res.send('Hello World');
});

app.get('/home', function(req,res){
    console.log(__dirname);
    res.sendfile(__dirname + '/init.html');
}); 

app.post('/request', function(req, res){
    console.log("received POST: app.post('/request', function(req, res){ ... }")

    console.log("req.param: " + req.param("email"));
    console.log("req.body: " + req.body);
    console.log("req: " + req); //[object Object]

    // TypeError: Converting circular structure to JSON
    // console.log("req (stringify)" + JSON.stringify(req))

    var myResponse = {thank : "you"}; // Received JSON - need reply with JSON

    res.setHeader("Content-Type", "text/html");
    res.write(JSON.stringify(myResponse));
    res.end();

    console.log("response sent");
});

app.listen(3001);
console.log('Listening on port 3001');

init.html

<!DOCTYPE html>
<html>
 <head>
  <meta charset="UTF-8">
  <title>Init</title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>

    <script>

        $(document).ready(function() {

            $("#login-button").click(function(event) {
                email = $("#email").val();
                console.log("submitting " + email);
                  event.preventDefault();
                  //var data = {imie: email};
                  //console.log(data);

                  $.ajax({
                    type: 'POST',
                    dataType: 'json',
                    url: 'request',
                    data: {email : "[email protected]"},
                    beforeSend: function(){console.log("sending: " + this.data);},
                    success: function(msg) {
                        console.log("success handler");
                        console.log(msg);
                    },
                    error:function (xhr, ajaxOptions, thrownError){
                        console.log(xhr.status);
                        console.log(thrownError);
                    } 
                  });
              });


        });
    </script>
 </head>
 <body>


     <input type="text" id="email" value="[email protected]"></input>

     <input type="submit" value="Send me your name!" id="login-button">

 </body>
</html>
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