Node js Difference between req query and req params

Question

Is there a difference between obtaining QUERY STRING arguments via req query myParam  and req params myParam  If so  when should I use which

User · Answer

Suppose you have defined your route name like this:

https://localhost:3000/user/:userid

which will become:

https://localhost:3000/user/5896544

Here, if you will print: request.params

{
userId : 5896544
}

so

request.params.userId = 5896544

so request.params is an object containing properties to the named route

and request.query comes from query parameters in the URL eg:

https://localhost:3000/user?userId=5896544

request.query

{

userId: 5896544

}

so

request.query.userId = 5896544

User · Answer

I want to mention one important note regarding req query   because currently I am working on pagination functionality based on req query and I have one interesting example to demonstrate to you     Example       Fetching patients from the database exports getPatients    req  res  next    gt     const pageSize    req query pageSize  const currentPage    req query currentPage   const patientQuery   Patient find    let fetchedPatients      If pageSize and currentPage are not undefined  if they are both set and contain valid values  if pageSize  amp  amp  currentPage                   Construct two different queries         - Fetch all patients         - Adjusted one to only fetch a selected slice of patients for a given page             patientQuery                        This means I will not retrieve all patients I find  but I will skip the first  n  patients            For example  if I am on page 2  then I want to skip all patients that were displayed on page 1                         Another example  if I am displaying 7 patients per page   I want to skip 7 items because I am on page 2             so I want to skip  7    2 - 1     gt  7 items                      skip pageSize    currentPage - 1                           Narrow dont the amound documents I retreive for the current page            Limits the amount of returned documents                        For example  If I got 7 items per page  then I want to limit the query to only            return 7 items                        limit pageSize     patientQuery then documents   gt        res status 200  json           message   Patients fetched successfully           patients  documents                    You will noticed   sign in front of req query pageSize and req query currentPage  Why  If you delete   in this case  you will get an error  and that error will be thrown because we will use invalid type  with error message  limit  field must be numeric    Important  By default if you extracting something from these query parameters  it will always be a string  because it s coming the URL and it s treated as a text    If we need to work with numbers  and convert query statements from text to number  we can simply add a plus sign in front of statement

User · Answer

You should be able to access the query using dot notation now   If you want to access say you are receiving a GET request at  checkEmail type email amp utm source xxxx amp email xxxxx amp utm campaign XX and you want to fetch out the query used   var type   req query type      email   req query email      utm          source  req query utm source       campaign  req query utm campaign          Params are used for the self defined parameter for receiving request  something like  example    router get    userID food edit  foodID   function req  res      sample GET request at   xavg234 food edit jb3552    var userToFind   req params userID   gets xavg234  var foodToSearch   req params foodID   gets jb3552  User findOne   userid  userToFind     dummy code       then function user              catch function err  console log err

User · Answer

req params contains route parameters  in the path portion of the URL   and req query contains the URL query parameters  after the   in the URL    You can also use req param name  to look up a parameter in both places  as well as req body   but this method is now deprecated

User · Answer

Given this route  app get   hi  param1   function req res         and given this URL     http   www google com hi there qs1 you amp qs2 tube  You will have   req query      qs1   you     qs2   tube      req params      param1   there      Express req params

[node.js] Node.js: Difference between req.query[] and req.params

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