Question

Is it valid in HTML to have JSON as the input name, if properly escaped?

Ie:

<input type="text" name="{\"object\": \"value\", \"another object\": \"another value\"}">

Answer 1

According to ye older HTML doc, actually, no:

ID and NAME tokens must begin with a letter ([A-Za-z]) and may be
followed by any number of letters, digits ([0-9]), hyphens (“-“),
underscores (“_”), colons (“:”), and periods (“.”)

… though validators may have a different thoughts about it, of course. )