View JavaScript files with syntax highlighting, function analysis, and smart formatting. Free, fast, and secure browser-based viewer.
or click to browse files
Beautiful VS Code-inspired color coding for keywords, strings, functions, and comments
Automatically detect functions, classes, variables, imports, and exports
View function count, class count, variable count, and file size information
All processing happens in your browser - files never leave your device
This viewer supports modern JavaScript and related formats:
This viewer supports standard .js files, ES modules (.mjs), CommonJS modules (.cjs), React/JSX files (.jsx), and TypeScript files (.ts, .tsx). It also accepts plain text files containing JavaScript code. The viewer provides syntax highlighting for modern ES6+ features including arrow functions, classes, async/await, and destructuring.
This is primarily a read-only viewer for analyzing and reviewing JavaScript files. However, you can use the Minify and Beautify features to transform your code, then export it. For full editing and minification capabilities, use our JS/CSS Minifier tool.
Yes, your JavaScript files are completely secure. All file processing happens locally in your browser using JavaScript. Your files are never uploaded to any server, ensuring complete privacy for your source code and proprietary scripts.
Formatted: Shows JavaScript with syntax highlighting for keywords, strings, numbers, functions, and comments. Raw: Displays the original file content without any formatting. Structure: Shows an analyzed breakdown of functions, classes, variables, imports, and exports found in the file.
The viewer can handle JavaScript files up to 5MB. Larger files may cause performance issues in your browser. For very large codebases, consider viewing individual modules or using the minify feature to reduce file size before analysis.
The viewer provides syntax highlighting and structure detection but does not perform full JavaScript validation or linting. It highlights keywords, strings, and functions but cannot verify if your code will execute correctly. For validation, use tools like ESLint or your browser's developer console.