Cyclomatic Complexity Calculator | JavaScript Code Complexity Analyzer

Cyclomatic complexity calculator scores every JavaScript and TypeScript function's decision-point complexity in your browser. Spot risky code before review. Free, no signup. Designed specifically for developers and professionals, this free online analyzer runs entirely in your browser to process tasks quickly and securely. Enjoy unlimited usage with no data tracking and no registration required.

Also known as: cyclomatic complexity calculator · javascript complexity analyzer · measure code complexity online · code complexity checker free · function complexity score · cyclomatic complexity javascript · static code analysis tool

javascript and typescript tools

analyzers

developer utilities

JavaScript Input

Complexity Report

Your complexity report will appear here

Paste JavaScript and click Analyze Complexity.

About Cyclomatic Complexity Calculator

Scores every function in a JavaScript or TypeScript file for cyclomatic complexity, the classic McCabe metric that counts independent paths through the code. Everything runs locally in your browser with the acorn parser, nothing is uploaded.

Key Features

Scores every function separately using if/else, loops, switch cases, try/catch and && / || / ?? as decision points
Sorts results from highest to lowest complexity so the riskiest function surfaces first
Flags module-level code that sits outside any function
Copy or download a plain-text report for pull request notes or CI logs

Use Cases

Spot functions that need refactoring before a code review
Set a mental complexity budget for new pull requests
Explain why a specific function is hard to test or reason about

Related Keywords

cyclomatic complexity calculator

javascript complexity analyzer

code complexity checker

mccabe complexity

static code analysis

function complexity score

Privacy & Security

All processing happens locally in your browser. Your data never leaves your computer, ensuring complete privacy and security.

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Frequently asked questions

What is Cyclomatic Complexity Calculator used for?

Cyclomatic complexity calculator scores every JavaScript and TypeScript function's decision-point complexity in your browser. Spot risky code before review. Free, no signup.

Is Cyclomatic Complexity Calculator free to use?

Yes. Cyclomatic Complexity Calculator is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use Cyclomatic Complexity Calculator?

No. Cyclomatic Complexity Calculator works immediately in your browser with no signup, login, or email address required.

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