Code Linter
Check your code for common issues, style violations, and best practices
No issues found yet
Enter code and click "Lint Code"
About the Code Linter
This code linter checks a pasted snippet for syntax problems, style inconsistencies and common mistakes, reporting each with its line number. It needs no install and no project setup, which suits reviewing code you did not write.
A code linter reads code without running it and reports what looks wrong. It catches the errors that are cheap to find and expensive to debug — an unclosed bracket, a missing semicolon where one matters, an unused variable, a comparison that will not behave as intended.
The point of a browser-based one is the absence of setup. Linting a snippet from a code review, a pull request comment or a blog post normally means creating a file in a configured project first; here you paste it and read the findings.
Findings come with line numbers so they can be acted on directly. For ongoing work a linter wired into your editor and CI is the right answer, since it enforces one shared configuration. This is for one-off checks and unfamiliar code.
How to use the Code Linter
- Paste your code. Enter the snippet you want checked.
- Run the lint. Issues are reported with their line numbers.
- Read the findings. Work through syntax problems first, then style warnings.
- Fix and re-check. Correct the code and lint again to confirm.
Code Linter features
- Syntax problem detection
- Style and consistency warnings
- Common mistake checks such as unused variables
- Line numbers on every finding
- No install or project configuration needed
- Runs entirely in your browser
Frequently asked questions
What does a linter actually check?
It reads code without running it and reports syntax problems, style inconsistencies and common mistakes such as unused variables.
Does it replace a linter in my editor?
No. For ongoing work use one wired into your editor and CI so everyone shares a configuration. This suits one-off checks.
Are findings given line numbers?
Yes. Every issue is reported with its line so you can go straight to it.
Will it catch runtime bugs?
No. Static analysis catches structural and style problems, not logic errors that only appear when the code runs.
Is my code uploaded?
No. Linting happens entirely in your browser.