Dependency-free lexical formatters aimed at viewers: they re-indent a document so a human can read it, without validating it. More...

Functions
N_STR *	n_pretty_js (const char *text)
	Conservatively re-indent JavaScript (newlines at top-level braces and semicolons, two-space indent by brace depth).

N_STR *	n_pretty_json (const char *text)
	Reformat a JSON document with cJSON (parse + print).

N_STR *	n_pretty_xml (const char *text)
	Re-indent an XML or HTML document (one tag or text run per line).

Detailed Description

Dependency-free lexical formatters aimed at viewers: they re-indent a document so a human can read it, without validating it.

Malformed input is reformatted on a best-effort basis; the formatters never crash on it.

Limits by design (these are viewers, not compilers):

n_pretty_xml() treats HTML like XML with void-element and raw-text (script/style) awareness; whitespace inside text nodes is trimmed at both ends, so whitespace-significant content (pre) is not preserved exactly.
n_pretty_js() is a conservative re-indenter (newlines at braces and semicolons), not a beautifier. Strings, template literals, comments and regex literals are copied verbatim. A '/' is lexed as a regex when it follows an operator, an opener, a separator, or an expression keyword (return, typeof, case, ...); the remaining ambiguity (a regex right after a closing parenthesis, as in if (x) /re/.test(y)) is lexed as division, which can only mis-break lines, never corrupt the text.
n_pretty_json() needs the vendored cJSON (HAVE_CJSON); without it the function logs an error and returns NULL.

All functions return a freshly allocated N_STR the caller must release with free_nstr(), or NULL when the input is NULL, empty, or does not look like the expected format.