JavaScript Analyzer - Code Size Statistics

Analyze JavaScript code for size, functions, variables, and complexity. Find optimization opportunities. Browser-based, private analysis.

JavaScript Input

File size, function count, variable declarations, lines of code, comments, and estimated minification savings.

Yes. All analysis happens in your browser. No code is sent to any server.

The tool estimates savings from whitespace and comment removal. Actual minifiers may achieve slightly different results.

It performs basic analysis, not validation. Syntax errors may affect the statistics.

It shows function count and nesting depth as rough complexity indicators.

Modern JavaScript syntax including arrow functions, classes, and template literals is recognized.

Import and export statements are counted to give an idea of module dependencies.

The tool works best with plain JavaScript. TypeScript syntax may affect accuracy since type annotations aren't standard JavaScript.

Both regular functions and arrow functions are counted, including nested ones. Nesting depth affects complexity metrics.

Each file is analyzed independently. Paste concatenated code to analyze multiple files together, or run analysis on each separately.