Code Complexity

Calculates cyclomatic and cognitive complexity for JavaScript/TypeScript functions, helping you identify code that is hard to test and maintain.

• →Paste JavaScript or TypeScript source code into the left panel and press Analyse to see per-function scores.
• →Each function is colour-coded: green (1–5) is simple, yellow (6–10) moderate, orange (11–20) complex, red (21+) very complex.
• →Try a preset from the example picker to see how simple, nested, and deeply branched code score differently.