Category: JavaScript

Use Math for rounding, random, min/max, and trigonometry.

Throw and handle errors intentionally for resilient apps.

Wrap risky code with try/catch/finally.

Read/write cookies carefully; prefer HttpOnly cookies for auth tokens from the server.

Serialize data with JSON.stringify and parse with JSON.parse.

Combine Constraint Validation API with custom checks.

Match patterns with RegExp literals and methods like test/match/replace.

Persist client data with localStorage, sessionStorage, and cookies.

Save string key/values that persist across sessions.

Store per-tab temporary data with sessionStorage.