RFC 9535 JSONPath queries for
Jennifer, over json.Value. The whole RFC:
name, wildcard, index, slice and filter selectors, descendant segments,
comparisons and logic, and the functions length, count, match,
search and value, with I-Regexp patterns. Every case of the official
JSONPath Compliance Test Suite passes. Results come as values, as JSON
Pointers for the json writers, or as normalized paths.
jvc add @deckyard/jsonpath
Or unpack src/ from a release archive (deckyard-jsonpath-<version>.tar.gz)
into vendor/deckyard/jsonpath/.
use fs;
use io;
use json;
import "@deckyard/jsonpath/" as jsonpath;
def doc as json.Value init json.decode(fs.readString("store.json"));
for (def title in jsonpath.query($doc, "$..book[[email protected] < 10].title")) {
io.printf("%s\n", json.asString($title));
}
def p as jsonpath.Path init jsonpath.compile("$..book[?search(@.author, 'Tolkien')]");
for (def m in jsonpath.find($doc, $p)) {
io.printf("%s at %s\n", json.encode($m.value), $m.pointer);
}
Jennifer 0.25.0 or newer, default or jennifer-tiny binary. No capability.
tools/check-all.sh # the full gate, as CI runs it jennifer test src/jsonpath_test.j # unit tests and the compliance suite tools/check-docs.sh # docs against the code tools/pack.sh dist # build the release archive
testdata/cts is the vendored compliance suite (BSD-2, see its README).
LGPL-3.0-only, see LICENSE. Copyright (C) 2026 mplx <[email protected]>.