2025-04-16 07:19

Status: adult

Tags: computer-science expressjs

Query Params

const mockUsers = [
	{id: 1, username: "anson", displayName: "Anson"},
	
	{id: 2, username: "ivan", displayName: "Ivan"},
	
	{id: 3, username: "john", displayName: "John"},
]
 
...
 
// Route to get all users
 
app.get("/api/users", (req, res) => {
 
	console.log(req.query)
	
	const {
	
		query: { filter, value }
	
	} = req;
	
	if (filter && value) return res.send(
		mockUsers.filter((user) => user[filter].includes(value))
	);  
	
	// when filter or value is undefined
	return res.send(mockUsers);
 
});
 

Explanation

• when using a get request, you can make certain types of requests.
  • i.e. the url may look like this: http://localhost:3000/api/users?filter=username&value=an
  • in this case after the question mark, you can “filters” to the url to get certain information
  • in this case, we are filtering by username and then more specifically the substring an
  • the result is [
    • {“id”:1,“username”:“anson”,“displayName”:“Anson”},{“id”:2,“username”:“ivan”,“displayName”:“Ivan”}
    • ]
• I’ve also included other checks to make sure that a filter and value is entered, otherwise the server will just return all mock users

References

Anson