How to get GET query string variables in Express js on Node js

Question

Can we get the variables in the query string in Node js just like we get them in   GET in PHP   I know that in Node js we can get the URL in the request  Is there a method to get the query string parameters

User · Answer

app get   user  id   function req  res        res send  user    req params id             You can use this or you can try body-parser for parsing special element from the request parameters

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It is so simple   Example URL   http   stackoverflow com 3000 activate accountid 3 amp activatekey  2a 08 jvGevXUOvYxKsiBt PpMs zgzD4C wwTsvjzfUrqLrgS3zXJVfVRK   You can print all the values of query string by using   console log  All query strings      JSON stringify req query      Output     All query strings      id   3   activatekey    2a 08 jvGevXUOvYxKsiBt PpMs zgzD4C wwTsvjz   fUrqLrgS3zXJVfVRK     To print specific   console log  activatekey      req query activatekey     Output     activatekey   2a 08 jvGevXUOvYxKsiBt PpMs zgzD4C wwTsvjzfUrqLrgS3zXJVfVRK

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A small Node js HTTP server listening on port 9080  parsing GET or POST data and sending it back to the client as part of the response is   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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I learned from the other answers 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 amp option 456

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I am using MEANJS 0 6 0 with express 4 16  it s good  Client   Controller   var input     keyword  vm keyword    ProductAPi getOrder input    services   this getOrder   function  input   return  http get   api order     params  input         Server  routes  app route   api order   get products order     controller  exports order   function  req  res      var keyword   req query keyword

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For Express js you want to do req params   app get   user  id   function req  res      res send  user    req params id

User · Answer

You can use with express  4 15 4   var express   require  express        router   express Router    router get      function  req  res  next        console log req query         Hope this helps

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You should be able to do something like this   var http   require  http    var url    require  url     http createServer function req res       var url parts   url parse req url  true       var query   url parts query       console log query      Object       res end  End

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In Express  use req query  req params only gets the route parameters  not the query string parameters   See the express or sails 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  Side note- if you re aiming to get the intersection of all three types of request parameters  similar to PHP s   REQUEST   you just need to merge the parameters together-- here s how I set it up in Sails   Keep in mind that the path route parameters object  req params  has array properties  so order matters  although this may change in Express 4

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Since you ve mentioned Express js in your tags  here is an Express-specific answer  use req query  E g   var express   require  express    var app   express     app get      function req  res     res send  id      req query id        app listen 3000

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UPDATE 4 May 2014   Old answer preserved here  https   gist github com stefek99 b10ed037d2a4a323d638    1  Install express  npm install express  app js  var express   require  express    var app   express     app get   endpoint   function request  response        var id   request query id      response end  I have received the ID      id        app listen 3000   console log  node express app started at http   localhost 3000      2  Run the app  node app js  3  Visit in the browser  http   localhost 3000 endpoint id something     I have received the ID  something      many things have changed since my answer and I believe it is worth keeping things up to date

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There are 2 ways to pass parameters via GET method Method 1   The MVC approach where you pass the parameters like  routename  paramname In this case you can use req params paramname to get the parameter value For Example refer below code where I am expecting Id as a param link could be like   http   myhost com items 23  var express   require  express    var app   express    app get  items  id   function req  res        var id   req params id        further operations to perform     app listen 3000     Method 2   General Approach   Passing variables as query string using     operator  For Example refer below code where I am expecting Id as a query parameter link could be like   http   myhost com items id 23  var express   require  express    var app   express    app get   items   function req  res        var id   req query id        further operations to perform     app listen 3000

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If you are using ES6 and Express  try this destructuring approach   const  id  since  fields  anotherField    request query    In context    const express   require  express    const app   express     app get      function req  res      const  id  since  fields  anotherField    req query       app listen 3000     You can use default values with destructuring too    x000D   x000D     sample request for testing x000D  const req     x000D    query    x000D      id   123   x000D      fields    a    b    c   x000D      x000D    x000D   x000D  const   x000D    id  x000D    since   new Date   toString    x000D    fields     x    x000D    anotherField    default  x000D      req query  x000D   x000D  console log id  since  fields  anotherField  x000D   x000D   x000D

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In Express it s already done for you and you can simply use req query for that  var id   req query id       GET  quot id quot    Otherwise  in NodeJS  you can access req url and the builtin url module to url parse it manually  var url   require  url    var url parts   url parse request url  true   var query   url parts query

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If you ever need to send GET request to an IP as well as a Domain  Other answers did not mention you can specify a port variable   you can make use of this function   function getCode host  port  path  queryString        console log       host         port   path          Running httpHelper getCode             Construct url and query string     const requestUrl   url parse url format           protocol   http           hostname  host          pathname  path          port  port          query  queryString               console log       host   path          Sending GET request          Send request     console log url format requestUrl       http get url format requestUrl    resp    gt            let data                   A chunk of data has been received          resp on  data    chunk    gt                console log  GET chunk      chunk               data    chunk                          The whole response has been received  Print out the result          resp on  end        gt                console log  GET end of response      data                       on  error    err    gt            console log  GET Error      err               Don t miss requiring modules at the top of your file   http   require  http    url   require  url     Also bare in mind that you may use https module for communicating over secured domains and ssl  so these two lines would change   https   require  https        https get url format requestUrl    resp    gt

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get query amp params in express    etc  example com user 000000 sex female  app get   user  id   function req  res       const query   req query    query    sex  female      const params   req params    params    id  000000

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Whitequark responded nicely  But with the current versions of Node js and Express js it requires one more line  Make sure to add the  require http   second line   I ve posted a fuller example here that shows how this call can work  Once running  type http   localhost 8080  name abel amp fruit apple in your browser  and you will get a cool response based on the code   var express   require  express    var http   require  http    var app   express     app configure function        app set  port   8080        app get      function req  res     res writeHead 200    content-type    text plain       res write  name      req query name     n      res write  fruit      req query fruit     n      res write  query      req query     n      queryStuff   JSON stringify req query     res end  That  s all folks       n    queryStuff        http createServer app  listen app get  port    function        console log  Express server listening on port     app get  port

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In express js you can get it pretty easy  all you need to do in your controller function is   app get       req  res  next    gt       const  id    req query        rest of your code here         And that s all  assuming you are using es6 syntax   PD   id  stands for Object destructuring  a new es6 feature

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You can use  request query  lt varible-name gt

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So  there are two ways in which this  id  can be received   1  using params  the code params will look something like    Say we have an array   const courses          id  1      name   Mathematics           id  2      name   History         Then for params we can do something like   app get   api posts  id   req res   gt       const course   courses find o  gt o id     req params id       res send course         2  Another method is to use query parameters  so the url will look something like        api xyz id 1  where   id 1  is the query part  In this case we can do something like    app get   api posts   req res   gt       const course   courses find o  gt o id     req query id       res send course

User · Answer

you can use url module to collect parameters by using url parse   var url   require  url    var url data   url parse request url  true   var query   url data query    In expressjs it s done by   var id   req query id    Eg   var express   require  express    var app   express     app get   login   function  req  res  next        console log req query       console log req query id     Give parameter id

[node.js] How to get GET (query string) variables in Express.js on Node.js?

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