How to access the GET parameters after in Express

Question

I know how to get the params for queries like this   app get   sample  id   routes sample     In this case  I can use req params id to get the parameter  e g  2 in  sample 2    However  for url like  sample 2 color red  how can I access the variable color   I tried req params color but it didn t work

User · Answer

Update  req param   is now deprecated  so going forward do not use this answer     Your answer is the preferred way to do it  however I thought I d point out that you can also access url  post  and route parameters all with req param parameterName  defaultValue    In your case   var color   req param  color      From the express guide      lookup is performed in the following order          req params   req body   req query      Note the guide does state the following      Direct access to req body  req params  and req query should be   favoured for clarity - unless you truly accept input from each object    However in practice I ve actually found req param   to be clear enough and makes certain types of refactoring easier

User · Answer

Zugwait s answer is correct  req param   is deprecated  You should use req params  req query or req body   But just to make it clearer   req params will be populated with only the route values  That is  if you have a route like  users  id  you can access the id either in req params id or req params  id     req query and req body will be populated with all params  regardless of whether or not they are in the route  Of course  parameters in the query string will be available in req query and parameters in a post body will be available in req body   So  answering your questions  as color is not in the route  you should be able to get it using req query color or req query  color

User · Answer

A nice technique i ve started using with some of my apps on express is to create an object which merges the query  params  and body fields of express s request object        express-data js const     require  lodash     class ExpressData                  param  Object  req - express request object            constructor  req               Merge all data passed by the client in the request         this props     merge req body  req params  req query              module exports   ExpressData    Then in your controller body  or anywhere else in scope of the express request chain  you can use something like below       some-controller js  const ExpressData   require    express-data js    const router   require  express   Router      router get    some id    req  res    gt         let props   new ExpressData req  props         Given the request   592363122 foo bar amp hello world        the below would log out                    some id  592363122           foo   bar            hello   world               console log props        return res json props         This makes it nice and handy to just  delve  into all of the  custom data  a user may have sent up with their request    Note  Why the  props  field  Because that was a cut-down snippet  I use this technique in a number of my APIs  I also store authentication   authorisation data onto this object  example below          param  Object  req - Request response object    class ExpressData                  param  Object  req - express request object            constructor  req               Merge all data passed by the client in the request         this props     merge req body  req params  req query              Store reference to the user         this user   req user    null             API connected devices  Mobile app    will send x-client header with requests  web context is implied            This is used to determine how the user is connecting to the API          this client    req headers     req headers  x-client       req client     web       web

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const express   require  express   const bodyParser   require  body-parser   const   usersNdJobs  userByJob  addUser   addUserToCompany     require     db db js    const app   express   app set  view engine    pug   app use express static  public    app use bodyParser urlencoded   extended  false     app use bodyParser json     app get       req  res    gt      usersNdJobs        then  users    gt          res render  users     users                catch console error      app get   api company users    req  res    gt      const companyname   req query companyName   console log companyname    userByJob companyname       then  users    gt          res render  job     users           catch console error      app post   api users add    req  res    gt      const userName   req body userName   const jobName   req body jobName   console log  user name     userName    job name     jobName    addUser userName  jobName       then  result    gt          res status 200  json result              catch  error    gt          res status 404  json    message   error toString                app post   users add    request  response    gt      const   userName  job     request body   addTeam userName  job     then  user    gt        response status 200  json          userName   user name         city   user job           catch  err    gt        request status 400  json   message   err            app post   api user company add    req  res    gt      const userName   req body userName   const companyName   req body companyName   console log userName  companyName    addUserToCompany userName  companyName     then  result    gt        res json result          catch console error      app get   api company user    req  res    gt     const companyname   req query companyName  console log companyname   userByJob companyname    then  users    gt       res render  jobs     users            app listen 3000       gt    console log  Example app listening on port 3000

User · Answer

The express manual says that you should use req query to access the QueryString      Requesting  display post size small app get   display post   function req  res  next       var isSmall   req query size      small       gt  true

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Use req query  for getting he value in query string parameter in the route  Refer req query  Say if in a route  http   localhost 3000  name satyam you want to get value for name parameter  then your  Get  route handler will go like this  -  app get      function req  res       console log req query name       res send  Response send to client    req query name

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Query string and parameters are different   You need to use both in single routing url   Please check below example may be useful for you   app get   sample  id   function req  res      var id   req params id    or use req param  id                              Get the link to pass your second segment is your id example  http   localhost port sample 123  If you facing problem please use Passing variables as query string using     operator    app get   sample   function req  res          var id   req query id                                      Get link your like this example  http   localhost port sample id 123  Both in a single example   app get   sample  id   function req  res      var id   req params id    or use req param  id    var id2   req query id                             Get link example  http   localhost port sample 123 id 123

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So  after checking out the express reference  I found that req query color would return me the value I m looking for   req params refers to items with a     in the URL and req query refers to items associated with the      Example    GET  something color1 red amp color2 blue   Then in express  the handler    app get   something    req  res    gt        req query color1      red      true     req query color2      blue     true

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In my case with the given code  I was able to parse the value of the passed parameter in this way   x000D   x000D  const express   require  express    const bodyParser   require  body-parser     const app   express     app use bodyParser urlencoded   extended  false        url par1 val1 amp par2 val2  let val1  req body par1  let val2   req body par2  x000D   x000D   x000D

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