Bodyparser is incorrectly parsing JSON?

I'm using the body-parser NPM module with Express to parse json on my server, but for some reason, the JSON is showing up incorrectly on the server. Here is my server code:

...
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));
...

app.route("/schedule")
    .get(function(req, res) {
        ... 
    })
    .post(function(req, res) {
        var schedule = req.body.schedule;

        console.log(req.body);

        if(schedule) {
            setSchedule(schedule);
            res.status(200).end();
        }
    });

And my client code:

var schedule = {
    entries: entries
};

var str = JSON.stringify(schedule);

console.log("Submitting schedule:",str);
post("/schedule", str)
    .then((res) => {
        this.completed(res.json);
    })
    .catch((res) => {
        this.failed(res.text);
    });

When I POST the data from the client, the client prints this:

Submitting schedule: {"entries":[1430014800000,1430055600000,1430104620000,1430146380000,1430194140000,1430236920000,1430283120000,1430326860000,1430371740000,1430416380000,1430460180000,1430505480000,1430548500000,1430594460000,1430636760000,1430683260000,1430725020000,1430772060000,1430813340000,1430860920000,1430901720000,1430949900000,1430990340000,1431039060000,1431079200000,1431128520000,1431168480000,1431218220000,1431258360000,1431308160000,1431349020000,1431398040000,1431440220000,1431487800000,1431531360000,1431577260000,1431622140000,1431666540000,1431712440000,1431755640000,1431802320000,1431844680000,1431891960000,1431933660000,1431981360000,1432022580000,1432070700000,1432111560000,1432159980000,1432200540000,1432249260000,1432289580000,1432338600000,1432378860000,1432428060000,1432468500000,1432517520000,1432558560000]}

Which appears to be valid JSON, but on the server, req.body is this:

{ '{"entries":': { '1430014800000,1430055600000,1430104620000,1430146380000,1430194140000,1430236920000,1430283120000,1430326860000,1430371740000,1430416380000,1430460180000,1430505480000,1430548500000,1430594460000,1430636760000,1430683260000,1430725020000,1430772060000,1430813340000,1430860920000,1430901720000,1430949900000,1430990340000,1431039060000,1431079200000,1431128520000,1431168480000,1431218220000,1431258360000,1431308160000,1431349020000,1431398040000,1431440220000,1431487800000,1431531360000,1431577260000,1431622140000,1431666540000,1431712440000,1431755640000,1431802320000,1431844680000,1431891960000,1431933660000,1431981360000,1432022580000,1432070700000,1432111560000,1432159980000,1432200540000,1432249260000,1432289580000,1432338600000,1432378860000,1432428060000,1432468500000,1432517520000,1432558560000]': '' } }

which is an object that's only key is {"entries": and the value for that key is an object that's only key is an array of timestamps that should be sent as the value to entries.

Any help would be greatly appreciated.

Edit: Resolved

I've found the issue. It appears the module I'm using for making requests (superagent) automatically stringifies data, so the issue went away when I stopped stopped using JSON.stringify.