Don't let pesky React bugs ruin your day. Debugging in React can sometimes feel like a game of whack-a-mole. We're sharing some advanced tips and tricks that can help you save time and stress. Learn how to pinpoint issues faster and with more accuracy.

1. Advanced Tips and Tricks for Debugging React
Applications
React is a popular JavaScript library for building web application user interfaces. While
developing with React, developers face various issues that can be solved with strong
debugging skills. By effectively troubleshooting and resolving these problems,
developers can save time and deliver high-quality React applications.
Common issues during React development include syntax errors, rendering problems,
state management challenges, runtime errors, event handling issues, lifecycle method
errors, prop type mismatches, dependency conflicts, routing problems, styling and CSS
issues, and API integration problems. To resolve these issues, developers should read
error messages carefully, use debugging tools, and consult React’s documentation and
community resources.
Improving debugging skills allows developers to quickly identify and fix problems,
enabling them to overcome challenges efficiently and deliver high-quality React
applications.

2. Debugging in React Application
Debugging is essential for React developers, especially as projects grow more complex.
In this blog post, we will explore advanced debugging tips and tricks for React
applications. Our aim is to equip you with the knowledge and tools to tackle even the
most elusive bugs.
Strong debugging skills are essential for React applications. Techniques like console
logging, browser tools, and React Developer Tools can help address issues like
unexpected behavior, state management challenges, slow rendering, and complex data
flow. Error boundaries and the React Profiler aid in error handling and performance
optimization. By effectively applying these debugging skills, developers enhance
functionality and boost React application performance.
By refining your debugging skills, you’ll be well-prepared to navigate the complexities of
React application development and deliver robust and efficient solutions. So, let’s dive
into the world of debugging React applications and uncover the secrets of bug hunting!
1. Use console logging
Console.log in React helps debug code by logging information to the browser’s console.
It tracks variables, checks function execution, and inspects values during runtime.
Power of console.log:
Outputting Information: Console.log easily displays messages, variables, objects, and
other data types in the console.
Real-Time Insight: Placing console.log strategically reveals real-time insights, tracking
execution flow, variable values, and component/function interactions.
Problem Diagnosis: Console.log helps diagnose issues by logging relevant data such as
function parameters, intermediate values, or error messages.
Tracking Code Execution: By logging messages at key points like lifecycle methods or
event handlers, console.log enables tracking and validation of code execution.

3. Iterative Development: Console.log aids in iterative development by logging values and
verifying code output, facilitating incremental adjustments and validation.
In this example:
• The component renders a count value and provides buttons to increment and
double the count.
• The useEffect hook logs “Component rendered” once when the component is
mounted.
• The incrementCount function increments the count and logs the current count
value.
• The doubleCount function doubles the count and logs the current count value.
• A console log message “Rendering component” is placed to track the rendering
of the component.

4. • By observing the console output, you can see when the component is rendered,
track count changes, and monitor component rendering.
2. Use React Developer Tools
React Developer Tools is a browser extension that helps developers debug React
applications. It offers a range of features to understand, inspect, and manipulate
components and states. Here’s how it aids in debugging large-scale applications:
Component Hierarchy: Provides a tree view of all components, helping understand
complex hierarchies.
Component Inspection: Allows inspection of individual components, including props
and state.

5. State Management: Integrates with popular libraries like Redux to inspect and track
state changes.
Performance Profiling: Measures render times, identifies re-renders, and detects
performance bottlenecks.

6. React Developer Tools empowers developers by providing insights into React
applications, assisting in understanding hierarchies, inspecting states and props,
tracking changes, identifying performance issues, and debugging complex scenarios.
These capabilities are valuable for extensive and intricate codebases in large-scale
applications.
3. Implementing React Error Boundaries
• React Error Boundaries catch JavaScript errors in their child component tree
during rendering, lifecycle methods, and event handling.
• They prevent the entire application from crashing by handling errors gracefully.
• When an error occurs within the subtree of an Error Boundary component, it
displays a fallback UI instead of the crashed component tree.
• Error Boundaries are similar to “try-catch” blocks in JavaScript but are specific to
React components.
• They improve user experience by displaying a fallback UI and allowing the rest of
the application to function without disruption.
4. Utilize strict mode in react application

7. React Strict Mode is a developer tool that detects and flags potential problems in a
React application. It applies strict checks and warnings to identify common mistakes
and performance issues, helping developers address them during the development
process.
React Strict Mode helps in the following ways:
Identifying Unsafe Practices: Detects and warns about unsafe lifecycle methods,
deprecated features, and potential issues in your codebase.
Highlighting Side Effects: Detects unexpected side effects during component rendering,
helping you identify and fix unintended consequences.
Catching State Mutation: Warns about state mutations, ensuring a more predictable
and maintainable application state.
Detecting Deprecated Features: Alerts about deprecated features, encouraging
updating code to utilize recommended alternatives.
Performance Warnings: Provides performance-related warnings, optimizing application
rendering performance.
5. Debugging Asynchronous Operations
When debugging asynchronous operations in a React application, there are several
important points to consider. Here are some key aspects to look into:
API Calls: Use console.log or debugger before and after making requests. Check the
browser’s “Network” panel for details.
State Management: Console.log or debugger where state changes occur. Use browser
tools or extensions for deeper inspection.
Promises: Log resolved values and handle errors using console.log or debugger within
“then” and “catch” methods.

8. Conclusion:
Debugging React applications can be challenging, but with the right techniques and
tools, developers can effectively identify and resolve issues. In this post, we explored
advanced tips for debugging React apps, including console logging, React Developer
Tools, Error Boundaries, strict mode, and more. By following these steps, you’ll improve
your ability to tackle complex bugs and enhance the quality of your React applications.
Remember to be patient and persistent during the trial-and-error process of debugging.
Analyze error messages, consult React’s documentation and community resources, and
practice regularly to become a proficient debugger. With experience, you’ll gain a deeper
understanding of React’s inner workings and build robust applications.
Originally published by: Advanced Tips and Tricks for Debugging React Applications