Enter some JavaScript code and click "Validate" to check it for errors.
JavaScript Validator
Check your JavaScript code for errors and warnings online.
About the JavaScript Validator Tool
Our JavaScript Validator is a useful tool we made to help you write better, more reliable code. JavaScript can be tricky, and small mistakes like a missing semicolon or a misspelled variable name can stop your script from working. This tool acts as a quality checker, scanning your code to find common errors, potential bugs, and stylistic issues before you even run it.
You can just paste your script into the editor, and our tool will give you instant feedback. It helps you catch problems early, enforce consistent coding standards, and prevent bugs. So, using this JS linter is a great way to improve your code quality and save time on debugging.
How It Works
- Paste your JavaScript code into the text area above or open a .js file.
- Click the "Validate JavaScript" button.
- The tool will immediately analyze your code and show a list of errors and warnings.
- Each result points out the issue and gives you the exact line and column number.
- If your code is clean, you will get a nice success message!
Frequently Asked Questions
What is a JavaScript linter?
A JavaScript linter is a tool that automatically analyzes your code to find problems. It can detect syntax errors, but it also finds "non-error" issues, like stylistic inconsistencies or the use of bad practices that might lead to bugs later on. It's an essential tool for maintaining high-quality code.
Why is it important to lint my JavaScript?
Linting your JavaScript helps you catch bugs before they happen. It makes your code more consistent and readable, which is especially important when you're working on a team. It saves you a lot of time by automating the process of checking for common mistakes, so you can focus on building features.
What's the difference between an error and a warning?
In our tool, an "error" usually points to a syntax problem or a potential bug that will likely cause your code to fail (like using a variable that doesn't exist). A "warning" typically points to a stylistic issue or a violation of best practices that won't break your code but is still a good idea to fix (like unused variables or missing semicolons).
Does this tool work with modern JavaScript (ES6+)?
Yes, absolutely. We've configured the linter to support modern JavaScript syntax, including features like `let`, `const`, arrow functions (`=>`), and more. It will help you write clean and up-to-date code that follows the latest standards.
Is my code secure when I use this tool?
Yes, your code is 100% private. The entire validation process happens inside your web browser on your own computer. The script you paste is never uploaded or sent to our servers, so your work remains completely confidential.