ECMAScript Documentation

The ECMA-262 standard is the official documentation for the ECMAScript language.

Edition 5

The Fifth Edition of ECMA-262 has been approved and is available for public download.

Edition 4 (Historical)

After completion of the Third Edition, significant work was done to develop a Fourth Edition. Although development of a Fourth Edition was not completed, that work influenced ECMAScript, Fifth Edition and is continuing to influence the ongoing development of ECMAScript.

Edition 3

Additional Documentation