how to use module in same module file in node js

Question

aUtil.js

module.exports = {
    successTrue: function(data) { 
        return { data: data, success: true };
    },
    isLoggedin: async (req, res) { 
        //decoded token in req header
        //if decoded token success, 
        res.json(this.successTrue(req.decoded));
    }
}

that function call in test.js

router.get('/check', aUtil.isLoggedin, async (req, res) => { ... })

I want to use the function above in that function.

But I keep getting errors.

ReferenceError: successTrue is not defined

I tried many ways.

insert 'const aUtil = require('./aUtil')`
change to 'res.json(successTrue( ... )'

a little suggestion please use exports.successTrue = function () { } this is alot more cleaner — Afraz Ahmad
– Afraz Ahmad, Commented Jan 25, 2019 at 7:53
@AfrazAhmad That's subjective. For one I don't think it's cleaner at all. — nicholaswmin
– nicholaswmin, Commented Jan 25, 2019 at 7:55

nicholaswmin · Accepted Answer · 2019-01-25 07:54:10Z

3

Use this:

module.exports = {
    successTrue: function() {
      return { foo: 'bar' } 
    },

    isLoggedin: function() {
      console.log(this.successTrue())
    }
}

You're exporting an object, so this refers to itself.

Also make sure you're binding aUtils if you're using it as middleware like so:

router.get('/check', aUtil.isLoggedin.bind(aUtil), async (req, res) => { ... })

edited Jan 25, 2019 at 7:54

answered Jan 25, 2019 at 7:26

nicholaswmin

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9 Comments

Hyun Jin Over a year ago

I tried the same way, but I got an error. 'TypeError: this.successTrue is not a function'

nicholaswmin Over a year ago

How are you calling aUtil.isLoggedin? Edit your post to add the relevant code.

Hyun Jin Over a year ago

The function name was typed incorrectly. successTrue is right. I modified it.

nicholaswmin Over a year ago

The same concept stands. You should do: res.json(this.successTrue(req.decoded))

Hyun Jin Over a year ago

That's the old code, and I've corrected it when I saw your answer, but there's an error.

|

dun32 · Accepted Answer · 2019-01-25 07:38:52Z

2

Try this :

const aUtil = {
    successTrue: function() { //return json obj },
    isLoggedin: function() { 
        res.json(aUtil.successTrue( ... ));
    }
}
module.exports = aUtil;

answered Jan 25, 2019 at 7:38

dun32

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