•json — JSON

•json text reads JSON5, which includes all JSON. JSON5 adds comments, trailing commas, single-quoted strings, unquoted keys, hexadecimal numbers, Infinity and NaN. Objects become keyed vectors. Arrays become vectors. Strings become character vectors. Integers of up to 128 bits stay exact. true and false become $t and $f.

•json⁻¹ Y writes JSON text. Keyed axes become objects. Unkeyed axes become arrays. Character vectors become strings. Keyed entries that hold functions are left out. NaN writes as null.

["fill":v] •json text reads null as v. The default is NaN. An integer array with a null stays exact. ["fill":v] •json⁻¹ Y writes v as null. JSON covers the conversions.

Errors: DOMAIN for malformed JSON, with its line and column, and for values that JSON can’t hold: an infinity that isn’t fill, out-of-range floats, nonintegral rationals, complex numbers and other functions.