# Development Dependency

A package needed for development or testing but not for the application at runtime.

## What is **Development Dependency** in JavaScript?

**Development Dependency** — A package needed for development or testing but not for the application at runtime.

Level: Journeyman · [More JavaScript terms at this level](https://www.ask-codey.com/glossary/subjects/javascript/journeyman)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/development-dependency