I need to create url for get which is going to accept array, how in node.js/express extract array from request?

Question

I need to create url for get which is going to accept array, how in node.js/express extract array from request ? I need to pass array with names which parametes I need to back from Person

model.

/api/person # here I need to pass which fields I want to see but to be generic.

Answer 1

One option is using a JSON format.

http://server/url?array=["foo","bar"]

Server side

var arr = JSON.parse(req.query.array);

Or your own format

http://server/url?array=foo,bar

Server side

var arr = req.query.array.split(',');

Answer 2

You can encode an array in percent encoding just "overwriting" a field, formally concatenating the values.

app.get('/test', function(req,res){
    console.log(req.query.array);
    res.send(200);
});




localhost:3000/test?array=a&array=b&array=c

This query will print ['a','b','c'].

Answer 3

Express exposes the query parameter as an array when it is repeated more than once in the request URL:

app.get('/', function(req, res, next) {
   console.log(req.query.a)
   res.send(200)
}

GET /?a=x&a=y&a=z:
// query.a is ['x', 'y', 'z']

Same applies for req.body in other methods.