Developer ToolsFree Tool

Code Complexity Analyzer

Provided byDevBoltdevbolt.dev

Measures cyclomatic complexity, cognitive complexity, nesting depth, and maintainability index.

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About this tool

What Code Complexity Analyzer does

The Code Complexity Analyzer on DevBolt calculates cyclomatic complexity, cognitive complexity, nesting depth, and maintainability index for JavaScript and TypeScript functions. Users paste code into the web interface and receive a per-function report showing a risk rating (A through F) and a maintainability grade. The output includes actionable refactoring recommendations based on the calculated metrics. The tool processes code entirely within the browser, ensuring that source code never leaves the user's device. Results display each function's cyclomatic complexity score, cognitive complexity rating, nesting depth count, and a final maintainability letter grade, helping developers identify functions that may be difficult to read, test, or modify.

Step by step

How to use the DevBolt Code Complexity Analyzer

  1. 1

    Open the Code Complexity Analyzer on DevBolt

  2. 2

    Paste JavaScript or TypeScript code into the input field

  3. 3

    Click the Analyze button to process the code

  4. 4

    Review the per-function report showing cyclomatic, cognitive, nesting, and maintainability metrics

  5. 5

    Apply the refactoring recommendations to simplify complex functions

Is it right for you

Best for

JavaScript and TypeScript developers who want quick, client-side analysis of function-level complexity without uploading code to external services.

Limitations

  • Only supports JavaScript and TypeScript code
  • Analyzes individual functions rather than entire codebases
  • Complexity metrics measure one dimension of code quality and should be combined with other assessments
Questions

Code Complexity Analyzer FAQ

Does the Code Complexity Analyzer store or send my code to a server?
No, all analysis runs entirely in your browser. Your code never leaves your device, as the tool is designed for 100% client-side processing.
What do the cyclomatic complexity scores mean for my code?
Cyclomatic complexity measures the number of independent paths through a function. Scores above 10 indicate functions that are hard to test and maintain, as each branch adds test cases you need to write.
Can I analyze code other than JavaScript or TypeScript?
The DevBolt Code Complexity Analyzer currently supports JavaScript and TypeScript code only. Other languages are not supported at this time.
What is cognitive complexity and how is it different from cyclomatic complexity?
Cognitive complexity measures how difficult a function is to understand mentally, accounting for nested control flow and language constructs. It differs from cyclomatic complexity, which counts independent paths, by focusing on readability and comprehension effort.
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