Languages / JavaScript Core
Standard Library
JSON, regular expressions, dates, and Intl.
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JSON in JavaScript
JSON.parse and JSON.stringify are the built-in bridge between JavaScript values and UTF-8 text. This page covers syntax limits, revivers/replacers, and safe parsing—plus where jq fits when JSON lives in shell pipelines.
Regular expressions in JavaScript
RegExp matches patterns in strings—literals, flags, groups, and common String methods. This page summarizes syntax and API surface, including modern named groups and the RegExp.escape helper from recent editions.
Dates and Temporal
Date has been the built-in clock since ES1, but mutability and time-zone gaps push new code toward Temporal. This comparison covers what Date still does, what Temporal fixes, and how to choose in browsers and Node today.
Internationalization with Intl
Intl formats numbers, dates, lists, and plural messages using locale data built into the engine—without shipping your own locale files for common cases. This page maps the main constructors and when to reach for each.