ESLint in Browser
Lint JavaScript code locally using browser-based pattern matching.
Runs in your browserDeveloper
JavaScript Code
Issues
8Line 1:1 — Disallow var declarations, use let/const insteadno-var
💡 Use let or const instead of var
Line 1:1 — Detect declared but potentially unused variablesno-unused-vars (basic)
💡 Remove or use the declared variable
Line 2:1 — Detect declared but potentially unused variablesno-unused-vars (basic)
💡 Remove or use the declared variable
Line 3:1 — Disallow console.log statementsno-console
💡 Remove or replace console statements
Line 4:6 — Require === and !== instead of == and !=eqeqeq
💡 Use === instead of == and !== instead of !=
Line 5:3 — Disallow alert(), confirm(), prompt()no-alert
💡 Use custom modal/dialog instead
Line 7:1 — Disallow eval() — security riskno-eval
💡 Avoid eval(), use safer alternatives
Line 8:1 — Disallow debugger statementsno-debugger
💡 Remove debugger statements before deployment
How It Works
1
Paste Code
Paste your JavaScript code into the editor.
2
Run Lint
The tool analyzes your code for common issues.
3
Review Issues
See warnings and errors with line numbers and descriptions.
Key Features
✅
Pattern Matching
Detects common JavaScript code issues.
📊
Issue Report
Clear list of warnings and errors with locations.
💡
Fix Suggestions
Guidance on how to resolve each issue.
🔒
Local Processing
Code is analyzed entirely in your browser.
Use Cases
✦Quick code review before committing
✦Find common JavaScript mistakes
✦Check code quality without IDE setup
✦Learn best practices from lint suggestions