# Strict Mode

A JavaScript mode that rejects some error-prone behavior and changes certain runtime rules.

## What is **Strict Mode** in JavaScript?

**Strict Mode** — A JavaScript mode that rejects some error-prone behavior and changes certain runtime rules.

```javascript
"use strict";

const status = "Ready";
```

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

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/strict-mode