Parsing Query String in node js

Question

In this  Hello World  example      Load the http module to create an http server  var http   require  http        Configure our HTTP server to respond with Hello World to all requests  var server   http createServer function  request  response      response writeHead 200    Content-Type    text plain       response end  Hello World n            Listen on port 8000  IP defaults to 127 0 0 1 server listen 8000       Put a friendly message on the terminal console log  Server running at http   127 0 0 1 8000       How can I get the parameters from the query string   http   127 0 0 1 8000 status name ryan   In the documentation  they mentioned   node gt  require  url   parse   status name ryan   true    href    status name ryan    search    name ryan    query    name   ryan      pathname    status      But I did not understand how to use it  Could anyone explain

User · Answer

require  url   parse   status name ryan    parseQueryString  true   query   returns    name   ryan      ref  https   nodejs org api url html url urlobject query

User · Answer

node -v v9 10 1  If you try to console log query object directly you will get error TypeError  Cannot convert object to primitive value  So I would suggest use JSON stringify  const http   require  http    const url   require  url     const server   http createServer  req  res    gt        const parsedUrl   url parse req url  true        const path   parsedUrl pathname  query   parsedUrl query      const method   req method       res end  hello world n         console log  Request received on    path    method    method    query         JSON stringify query          console log  query     query             server listen 3000       gt  console log  Server running at port 3000       So doing curl http   localhost 3000 foo  fizz  buzz will return Request received on   foo   method  GET   query    fizz   buzz

User · Answer

You can use the parse method from the URL module in the request callback    var http   require  http    var url   require  url        Configure our HTTP server to respond with Hello World to all requests  var server   http createServer function  request  response      var queryData   url parse request url  true  query    response writeHead 200    Content-Type    text plain        if  queryData name           user told us their name in the GET request  ex  http   host 8000  name Tom     response end  Hello     queryData name     n         else       response end  Hello World n                Listen on port 8000  IP defaults to 127 0 0 1 server listen 8000     I suggest you read the HTTP module documentation to get an idea of what you get in the createServer callback  You should also take a look at sites like http   howtonode org  and checkout the Express framework to get started with Node faster

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There s also the QueryString module s parse   method   var http   require  http        queryString   require  querystring     http createServer function  oRequest  oResponse         var oQueryParams          get query params as object     if  oRequest url indexOf       gt   0            oQueryParams   queryString parse oRequest url replace                            do stuff         console log oQueryParams              oResponse writeHead 200    Content-Type    text plain         oResponse end  Hello world         listen 1337   127 0 0 1

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Starting with Node js 11  the url parse and other methods of the Legacy URL API were deprecated  only in the documentation  at first  in favour of the standardized WHATWG URL API  The new API does not offer parsing the query string into an object  That can be achieved using tthe querystring parse method     Load modules to create an http server  parse a URL and parse a URL query  const http   require  http    const   URL     require  url    const   parse  parseQuery     require  querystring        Provide the origin for relative URLs sent to Node js requests  const serverOrigin    http   localhost 8000       Configure our HTTP server to respond to all requests with a greeting  const server   http createServer  request  response    gt         Parse the request URL  Relative URLs require an origin explicitly    const url   new URL request url  serverOrigin        Parse the URL query  The leading     has to be removed before this    const query   parseQuery url search substr 1      response writeHead 200     Content-Type    text plain        response end  Hello    query name   n            Listen on port 8000  IP defaults to 127 0 0 1  server listen 8000       Print a friendly message on the terminal  console log  Server running at   serverOrigin       If you run the script above  you can test the server response like this  for example  curl -q http   localhost 8000 status name ryan Hello  ryan

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