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Node.js - global variables
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In this article, we would like to show you how to declare and use global variables in Node.js.
Quick solution:
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global.globalVariable = 'Global variable value.';2
console.log(globalVariable); // output: 'Global variable value.'
Global variables such as regular variables can be initialized with a value, changed, and even cleared out.
The only difference between a global variable and a regular variable is their scope.
In this example, we create global variable inside example.js file. We can also use and modify it in index.js file.
index.js
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require('./example.js');2
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console.log(globalVariable); // output: undefined4
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globalVariable = 'Value changed in index.js.'; 6
console.log(globalVariable); // output: 'Value changed in index.js.'example.js
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global.globalVariable = 'Example value initialized in example.js';2
console.log(globalVariable); // output: 'Example value initialized in example.js'3
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globalVariable = 'Value changed in example.js';5
console.log(globalVariable); // output: 'Value changed in example.js'6
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globalVariable = undefined;8
console.log(globalVariable); // output: undefinedRun the application :
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node index.jsOutput:
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Example value initialized in example.js2
Value changed in example.js3
undefined4
undefined5
Value changed in index.js.