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RFC 8259, "The JavaScript Object Notation (JSON) Data Interchange Format", December 2017

Source of RFC: jsonbis (art)

Errata ID: 5218
Status: Reported
Type: Technical

Reported By: Vasiliy Faronov
Date Reported: 2017-12-28

Section 12 says:

JSON is a subset of JavaScript

It should say:

JSON is nearly a subset of JavaScript

Notes:

JSON is not a subset of JavaScript: there are syntactically valid JSON texts that are not syntactically valid JavaScript. Namely, JSON strings can contain unescaped U+2028 LINE SEPARATOR or U+2029 PARAGRAPH SEPARATOR characters, while JavaScript string literals cannot. Thus, a sequence of characters U+0022 U+2028 U+0022 matches this RFC's 'string' production, but does not match ECMA-262's 'Expression' production.

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