JSON.stringify() has been "improved"

Anders Rundgren anders.rundgren.net at gmail.com
Mon Sep 21 03:56:57 UTC 2020


Hi ES-lovers,

I have co-authored a JSON canonicalization scheme, recently published as an RFC: https://www.rfc-editor.org/rfc/rfc8785.html

The work started with ES V6 as foundation since it made things really easy.

Serialization of quoted strings where taken "as is" from:
https://www.ecma-international.org/ecma-262/6.0/index.html#sec-quotejsonstring

However, to my dismay it seems that this has changed in more recent ES editions:
https://www.ecma-international.org/ecma-262/10.0/index.html#sec-quotejsonstring

That is, in V6 a smiley was serialized as any other UTF code point.
In V10 a smiley is (AFAICT...) supposed to be serialized like \ud83d\ude00 which of course breaks canonicalization :(

Q: What was the motivation for this change?

Q: How come Chrome, Edge, and Firefox do not honor this update?
Verification: https://cyberphone.github.io/doc/security/browser-json-canonicalization.html

Q: Does any other JSON serializer actually do this kind of transformation?

thanx,
Anders




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