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ECMAScript

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descriptionStandardized scripting language specification that defines the core language behind JavaScript.
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ECMAScript is the standardized scripting language specification that defines the core language behind JavaScript.

It is the language standard maintained through the ECMA-262 specification, while JavaScript is the most common implementation and ecosystem built on top of that standard.

What it does​

ECMAScript defines how the language itself behaves.

It is commonly used to:

  • Standardize JavaScript language features
  • Define syntax, semantics, and core behavior
  • Provide a stable spec for engines and runtimes
  • Guide language evolution across yearly editions
  • Keep implementations aligned across platforms

Core concepts​

Language standard behind JavaScript​

ECMAScript is the specification.

JavaScript is the most familiar real-world implementation and ecosystem built from that standard.

Specification, not framework​

ECMAScript is not a library, browser API, or framework.

It defines the language rules that engines implement.

Edition-based evolution​

ECMAScript evolves through published editions and accepted proposals.

That is why features are often discussed in terms of language standards and yearly updates.

Common use cases​

  • Explaining JavaScript language features
  • Referring to the official standard
  • Discussing language version support
  • Understanding cross-engine behavior
  • Distinguishing standard language features from browser or runtime APIs

Practical notes​

  • In everyday use, most people say JavaScript instead of ECMAScript.
  • ECMAScript matters most when precision about the language standard is important.
  • The standard and the surrounding ecosystem are related, but not identical.
  • This page belongs near language fundamentals and implementation/runtime discussions.

Sources Used​

Frequently Asked Questions​

Is ECMAScript the same as JavaScript?​

Not exactly. ECMAScript is the standard, while JavaScript is the most common implementation and ecosystem around it.

Why do people say ES6 or ECMAScript 2025?​

Because ECMAScript evolves through published editions, and language features are often grouped by those editions.

Is ECMAScript a browser feature?​

No. It is the language specification itself, not a browser-specific API.