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Automatic coloring of filenames and line numbers with different colors when logging errors

Overcoming Error Identification Challenges in Node.js with err-color

As a professional developer, Node.js is my go-to tool for daily programming tasks. It is an essential part of my workflow, allowing me to build robust web applications and backend services. However, one significant challenge I encounter regularly is locating the filename and line number of errors in the terminal. This issue often slows down my debugging process and affects my overall productivity. To address this, I turned to a tool called err-color, which automatically colors filenames and line numbers with different colors when logging errors. This solution has greatly enhanced my development experience.

Node.js: A Daily Essential for Development

Node.js is a powerful, open-source runtime environment that enables the execution of JavaScript code server-side. Built on Chrome's V8 JavaScript engine, Node.js offers an event-driven, non-blocking I/O model that makes it ideal for developing scalable and high-performance applications. Its ability to handle multiple requests concurrently without blocking operations allows developers like me to build real-time applications, microservices, and more with ease.

In my daily routine, I leverage Node.js to develop a wide range of projects, from simple scripts to complex systems. Its flexibility and extensive package ecosystem support a variety of use cases, making it indispensable for my work.

The Challenge: Identifying Filenames and Line Numbers in Error Logs

Despite the numerous advantages of Node.js, debugging can be a cumbersome process, particularly when dealing with extensive error logs. When an error occurs, the terminal often displays a long stack trace with crucial information buried within. Identifying the exact filename and line number where the error occurred can be time-consuming and frustrating, especially in larger projects with numerous files and dependencies.

This issue not only delays the debugging process but also increases the likelihood of errors being overlooked or misdiagnosed. Efficient error handling and quick identification of the root cause are vital for maintaining high code quality and meeting project deadlines.

The Solution: err-color

Get err-color from

To streamline error identification, I adopted a tool called err-color. This npm package automatically colors filenames and line numbers with different colors when logging errors, making it significantly easier to pinpoint the source of an issue. You can explore more about err-color here.

err-color enhances the readability of error logs by highlighting important details in distinct colors. This visual distinction helps developers quickly locate the relevant parts of the error message without being overwhelmed by less critical information.

Installing and Using err-color

Installing err-color is straightforward. Simply run the following command in your terminal:

npm install err-color

Once installed, integrate err-color into your project by adding the following line to your main file:

const colorErrLog = require('err-color').handleError;
let err = new Error('this is example of error message');


With err-color in place, any errors logged in the terminal will have filenames and line numbers automatically colored, improving their visibility and making the debugging process more efficient.


Benefits of Using err-color

The use of err-color offers several significant benefits, particularly in enhancing error handling and debugging efficiency:

  1. Faster Error Identification: By automatically coloring filenames and line numbers, err-color allows you to quickly locate the source of an error. This reduces the time spent sifting through lengthy error logs and accelerates the debugging process.

  2. Reduced Mistakes: Highlighting critical information minimizes the risk of overlooking errors or misinterpreting their causes. This leads to more accurate debugging and higher code quality.

  3. Improved Productivity: With less time spent on error identification, you can focus more on developing new features and optimizing existing code. This boosts overall productivity and allows for more efficient project management.

  4. Enhanced Readability for Large Projects: In projects with numerous files and dependencies, err-color proves invaluable by making error logs more readable. This helps manage complexity and ensures that errors are quickly and effectively addressed.


Node.js is an indispensable tool in my daily programming activities, offering the flexibility and performance needed to handle various development tasks. However, the challenge of locating filenames and line numbers in error logs can be a significant hindrance. By using err-color, I have been able to overcome this challenge, greatly enhancing my debugging efficiency and overall productivity.

The automatic coloring of filenames and line numbers provided by err-color simplifies the error identification process, reduces the likelihood of mistakes, and improves the readability of error logs. For any developer facing similar challenges, I highly recommend integrating err-color into your Node.js projects to streamline error handling and boost your development efficiency.

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