Encountering a ReferenceError while debugging MongoDB: The console object is undefined

Question

Encountering a ReferenceError while debugging MongoDB: The console object is undefined

Using a js file within mongodb, I implemented a code snippet containing a console.log expression for debugging purposes:

use test;
db.city.find().snapshot().forEach(function(city){
    var Pos = city.Pos;

    if (Pos) 
    {
        longLat = Pos.split(" ");
        console.log("longLat");  // for debugging ----------------------------  
        console.log(longLat);

        lon = longLat[0];
        lat = longLat[1];

        if (lon && lat)
        {
            lon = parseFloat(lon);
            lat = parseFloat(lat);
            longLat = [lon, lat];
            city.longLat = longLat;

        }

    }
    db.orgs.save(city);

})

Upon executing the script using:

mongo < /path/to/this/js/file.js

An error message is returned:

ReferenceError: console is not defined

Is there an alternative method to log interim results during debugging?

javascript mongodb mongodb-shell

Answer 1

Answer №1

Instead of using console.log(), you can utilize the print or printjson methods to emit output within the shell:

    if (Pos) 
    {
        longLat = Pos.split(" ");
        print("longLat");  // for debugging ----------------------------  
        printjson(longLat);

Answer 2

Instead of using console.log(), you can utilize the print or printjson methods to emit output within the shell:

    if (Pos) 
    {
        longLat = Pos.split(" ");
        print("longLat");  // for debugging ----------------------------  
        printjson(longLat);

Answer 3

Answer №2

In case you prefer not to modify your code, there is an alternative approach you can take.

var console = {};
console.log = print;

By utilizing this method, when your code invokes console.log, it will actually trigger print(). However, it's important to note that this replacement is not completely effective as it does not handle object printing in the same manner as NodeJS's console.log(). For instance,

console.log('abc', { 'field1' : 123 });
// The output in NodeJS is: abc { field1: 123 }
// The output with Mongo print is: abc [object Object]

An improved implementation would address this issue. If you are interested in developing a more robust solution, you may find guidance in the article Taking Over console.log.

Answer 4

In case you prefer not to modify your code, there is an alternative approach you can take.

var console = {};
console.log = print;

By utilizing this method, when your code invokes console.log, it will actually trigger print(). However, it's important to note that this replacement is not completely effective as it does not handle object printing in the same manner as NodeJS's console.log(). For instance,

console.log('abc', { 'field1' : 123 });
// The output in NodeJS is: abc { field1: 123 }
// The output with Mongo print is: abc [object Object]

An improved implementation would address this issue. If you are interested in developing a more robust solution, you may find guidance in the article Taking Over console.log.

Encountering a ReferenceError while debugging MongoDB: The console object is undefined

Answer №1

Answer №2

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