javascript - nodejs express application won't return json array - Stack Overflow

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I have the following express node.js app. It's using the 'redis' npm package.

app.get("/test",function(req,res){
    var data = [];
    client.HGETALL("receipts",function(err,obj){
        for(var id in obj){
            data.push(JSON.parse(obj[id]));
        }
    });
    console.log(data);
    res.json(data);
});

app.listen(3000);

The code run's without errors; however, the data variable is [] when it's returned to the browser.

The strange part is that when I run the same redis mands from the mand line, the array is populated.

Can anyone tell me what's going on here?

I have the following express node.js app. It's using the 'redis' npm package.

app.get("/test",function(req,res){
    var data = [];
    client.HGETALL("receipts",function(err,obj){
        for(var id in obj){
            data.push(JSON.parse(obj[id]));
        }
    });
    console.log(data);
    res.json(data);
});

app.listen(3000);

The code run's without errors; however, the data variable is [] when it's returned to the browser.

The strange part is that when I run the same redis mands from the mand line, the array is populated.

Can anyone tell me what's going on here?

• javascript
• node.js
• redis

Share Improve this question Follow asked Apr 4, 2012 at 22:44 Matt PhillipsMatt Phillips 11.5k1111 gold badges4848 silver badges7171 bronze badges

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1 Answer 1

Sorted by: Reset to default 10

Your code is asynchronous. The callback you pass doesn't get executed until after your console.log. Try:

app.get("/test",function(req,res){
    var data = [];
    client.HGETALL("receipts",function(err,obj){
        for(var id in obj){
            data.push(JSON.parse(obj[id]));
        }
        console.log(data);
        res.json(data);
    });
});

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