How to implement search and filtering in a REST API with nodejs and express
The parameters will be in req.query
.
{ 'firstName': 'john', 'age': '30' }
You can use arr.filter(callback[, thisArg])
for filtering.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter
Something like this:
function search(query) {
return function(element) {
for(var i in query) {
if(query[i] != element[i]) {
return false;
}
}
return true;
}
}
exports.search = function(query) {
return users.filter(search(query));
}
And in your route:
router.get('/users', function(req, res, next) {
return res.json({ users: users.search(req.query) });
});
Note: In the search
function you may need to do something about case, type, etc.
dukable
Updated on September 30, 2020Comments
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dukable over 3 years
I am learning and playing around with Node and Express by building a REST API. I don't have any DB to store data, I do everything in-memory.
Let's say I have an array of users:
var users = [{"id": "1", "firstName": "John", "lastName": "Doe"}];
and defined a getAllUser function:
exports.getAllUser = function(page, items) { page = (page < 1 ? 1 : page) || 1; items = (items < 1 ? 5 : items) || 5; var indexStart, indexEnd; indexStart = (page - 1) * items; indexEnd = indexStart + items; return users.slice(indexStart, indexEnd); };
and defined a route:
router.get('/users', function(req, res, next) { var page = req.query.page; items = req.query.items; page = page !== 'undefined' ? parseInt(page, 10) : undefined; items = items !== 'undefined' ? parseInt(items, 10) : undefined; res.status(200).json({ users: users.search(page, items) }); });
All of this works fine, I have been able to test it with Postman and my data is being returned.
My question is, how to implement search and filtering?
From what I understand, search parameters will be passed in the URL as parameters, for example:
http://localhost:8080/api/users/firstName=john&age=30
How would I extract those parameters with node, and is there a specific lib to use or best practices to follow?
Same question for filtering, or is filtering the same thing than search?
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dukable over 9 yearsThanks! I have edited my initial post to reflect how I am dealing with paging right now. I am really lacking some good practice example. I am trying to gather how to do this and that but when it's time to mix everything together I am kind of lost. Should I just pass the page, items AND query parameters all together to the getAllUser method?