In Express.js how would I write a route/regex to capture all US states?

Question

In Express.js how would I write a route/regex to capture all US states?

At the moment I have the states in a string as follows:

var states = 'AL|AK|AR|AZ|CA|CO|CT|DC|DE|FL|GA|HI|IA|ID|IL...';

I would like to capture

mydomain.com/CA/more-stuff

Into two separate parameters. The first one with the state information, the second one with the additional. I know how to get the additional information:

app.get('/' ??? + '/:additional', ...);

How can I capture the state information?

regex
node.js
express

Answer 1

If you define it as a parameter in the path...

app.get('/:stateabbr/:additional', ...);

You can validate it with app.param():

app.param('stateabbr', function (req, res, next, abbr) {
    var stateAbbrs = /AL|AK|AR|AZ|CA|CO|CT|DC|DE|FL|GA|HI|IA|ID|IL|../i

    if (stateAbbrs.test(abbr)) {
        next()
    } else {
        next(new Error('Unrecognized State abbreviation.'));
    }
});

Answer 2

Try this one

var states = 'AL|AK|AR|AZ|CA|CO|CT|DC|DE|FL|GA|HI|IA|ID|IL...';
app.get('/:state('+ states + ')/:additional', function(req,res,next){
    res.send('state:'+req.params.state+',additional:'+req.params.additional);
})

I've tested it and it should work as You requested :)