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.

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

Answer 1

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) => { ... })

Answer 2

Try this :

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