How to parse variables in querystring using Express?

Question

I have a request being sent to the server:

"/stuff?a=a&b=b&c=c"

Using express, how do I get these values?

I have tried the following...

app.get( "/stuff?:a&:b&:c", function( req, res ){});

...however it does not seem to recognize the route.

Thanks (in advance) for your help.

I have not tried this, but you should try /stuff?a=:a&b=:b&c=:c — chovy
– chovy, Commented Feb 3, 2013 at 5:29

mikemaccana · Accepted Answer · 2014-09-16 13:49:47Z

39

It's not a good idea to use a query string inside a route.

In Express logic you need create a route for "/stuff". The query string will be available in req.query.

edited Sep 16, 2014 at 13:49

mikemaccana

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answered Feb 3, 2013 at 8:59

Dmitry Manannikov

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1 Comment

Hector Correa Over a year ago

To add to this, Express explicitly states "Query strings are not considered when performing these matches" - expressjs.com/api.html

Marco · Accepted Answer · 2014-08-06 13:59:44Z

34

You can declare your route directly with /stuff, then query parameters are accessible through req.query, which is a JSON object. Here's your example:

app.get("/stuff", function(req, res) {
    var a = req.query.a;
    ...
});

In your case, req.query is equal to:

{ a: 'a',
  b: 'b',
  c: 'c' }

In Express' documentation (either 4.x and 3.x) you can find additional examples: Express - req.query.

answered Aug 6, 2014 at 13:59

Marco

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