From a2f559e8c38f6a5134c6d9488f3f56fa519a17d2 Mon Sep 17 00:00:00 2001
From: Yarchik <spoko.dev@gmail.com>
Date: Tue, 23 Jun 2026 01:21:46 +0100
Subject: [PATCH] fix(slice): explicit zero end no longer returns the whole
 array

A slice with an explicit `0` end (e.g. `$[:0]`, `$[2:0]`) returned the
entire array instead of an empty result. `end` was computed with
`(parts[1] && Number.parseInt(parts[1])) || len`, so a parsed end of `0`
is falsy and got replaced by the array length. Treat an omitted end
(empty string) as the length and parse any explicit value, including 0.
---
 src/jsonpath.js    |  2 +-
 test/test.slice.js | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/jsonpath.js b/src/jsonpath.js
index 15be4268..e2bdbb57 100644
--- a/src/jsonpath.js
+++ b/src/jsonpath.js
@@ -608,7 +608,7 @@ JSONPath.prototype._slice = function (
     const len = val.length, parts = loc.split(':'),
         step = (parts[2] && Number.parseInt(parts[2])) || 1;
     let start = (parts[0] && Number.parseInt(parts[0])) || 0,
-        end = (parts[1] && Number.parseInt(parts[1])) || len;
+        end = parts[1] ? Number.parseInt(parts[1]) : len;
     start = (start < 0) ? Math.max(0, start + len) : Math.min(len, start);
     end = (end < 0) ? Math.max(0, end + len) : Math.min(len, end);
     const ret = [];
diff --git a/test/test.slice.js b/test/test.slice.js
index afab5bd4..5034642c 100644
--- a/test/test.slice.js
+++ b/test/test.slice.js
@@ -42,4 +42,25 @@ describe('JSONPath - slice', function () {
         });
         assert.deepEqual(result, expected);
     });
+
+    it('should return empty array for a slice with an explicit zero end', function () {
+        const jsonWithChildren = {
+            "name": "root",
+            "children": [
+                {a: 1}, {a: 2}, {a: 3}, {a: 4}, {a: 5}, {a: 6}
+            ]
+        };
+        assert.deepEqual(jsonpath({
+            json: jsonWithChildren,
+            path: '$.children[:0]'
+        }), []);
+        assert.deepEqual(jsonpath({
+            json: jsonWithChildren,
+            path: '$.children[2:0]'
+        }), []);
+        assert.deepEqual(jsonpath({
+            json: jsonWithChildren,
+            path: '$.children[0:0]'
+        }), []);
+    });
 });