JavaScript best practices

Bharath Kumar Murugan
2 min readApr 6, 2023


As JavaScript has become one of the most widely used programming languages, it is crucial to follow the best practices for writing efficient and effective JavaScript code. In this article, we will discuss some of the best practices for JavaScript that every developer should follow.

  1. Use Strict Mode: The strict mode in JavaScript allows you to write secure and optimized code. It also catches common coding mistakes and makes debugging easier. To use strict mode, add the “use strict” statement at the beginning of your JavaScript file or function.
  2. Declare Variables Properly: Always declare variables using “let” or “const” keywords to prevent the accidental creation of global variables. Also, declare variables at the top of the scope to avoid hoisting.
  3. Use Arrow Functions: Arrow functions are a concise way of writing functions in JavaScript. They also have a lexical “this” binding, which means that “this” keyword inside an arrow function refers to the parent context.
  4. Avoid Using eval: The “eval” function executes arbitrary JavaScript code, which can cause security vulnerabilities. Avoid using “eval” and use other methods, such as JSON.parse, instead.
  5. Use Object and Array Destructuring: Object and array destructuring is a convenient way of extracting values from objects and arrays. It makes your code more readable and concise.
  6. Use Template Literals: Template literals allow you to embed expressions and variables inside a string. They are more readable and maintainable than traditional string concatenation.
  7. Minimize Global Variables: Avoid using global variables as they can cause naming conflicts and make debugging harder. Instead, use closures and modules to encapsulate your code.
  8. Use “=== “ instead of “==”: Always use strict equality operators “===” and “!==” instead of loose equality operators “== “ and “!=”. This ensures that you compare values and data types correctly.
  9. Keep your Code Modular: Break your code into small, reusable modules to make it more maintainable and scalable. This also makes testing and debugging easier.
  10. Use a Linter: Use a linter such as ESLint to catch common coding mistakes and enforce best practices. It can also help you maintain a consistent coding style across your team.

By following these best practices, you can write efficient, secure, and maintainable JavaScript code. These practices will help you avoid common pitfalls and make your code more readable and scalable.



Bharath Kumar Murugan

FrontEnd Developer | Javascript Enthusiast | Linux | Docker