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

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&utm_source=xxxx&email=xxxxx&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

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

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

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

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

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

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