diff --git a/testing/json.test b/testing/json.test
index 45a4ecf8e..61c5e5177 100755
--- a/testing/json.test
+++ b/testing/json.test
@@ -980,6 +980,240 @@ do_execsql_test json_control_chars {
   SELECT json(jsonb('{"control": "Bell: \u0007 Backspace: \u0008 Form feed: \u000C"}'));
 } {{{"control":"Bell: \u0007 Backspace: \u0008 Form feed: \u000C"}}}
 
+
+# Tests for json_replace() function
+
+# Basic replacement tests
+do_execsql_test json_replace_basic_1 {
+    SELECT json_replace('{"a": 1, "b": 2}', '$.a', 42)
+} {{{"a":42,"b":2}}}
+
+do_execsql_test json_replace_basic_2 {
+    SELECT json_replace('{"a": 1, "b": 2}', '$.c', 3)
+} {{{"a":1,"b":2}}}
+
+do_execsql_test json_replace_multiple_paths {
+    SELECT json_replace('{"a": 1, "b": 2, "c": 3}', '$.a', 10, '$.c', 30)
+} {{{"a":10,"b":2,"c":30}}}
+
+# Testing different JSON types
+do_execsql_test json_replace_string {
+    SELECT json_replace('{"name": "Alice"}', '$.name', 'Bob')
+} {{{"name":"Bob"}}}
+
+do_execsql_test json_replace_number_with_string {
+    SELECT json_replace('{"age": 25}', '$.age', 'unknown')
+} {{{"age":"unknown"}}}
+
+do_execsql_test json_replace_with_null {
+    SELECT json_replace('{"a": 1, "b": 2}', '$.a', NULL)
+} {{{"a":null,"b":2}}}
+
+do_execsql_test json_replace_with_json_object {
+    SELECT json_replace('{"user": {"name": "Alice"}}', '$.user', '{"name": "Bob", "age": 30}')
+} {{{"user":"{\"name\": \"Bob\", \"age\": 30}"}}}
+
+# Array tests
+do_execsql_test json_replace_array_element {
+    SELECT json_replace('[1, 2, 3, 4]', '$[1]', 99)
+} {{[1,99,3,4]}}
+
+do_execsql_test json_replace_array_negative_index {
+    SELECT json_replace('[1, 2, 3, 4]', '$[#-1]', 99)
+} {{[1,2,3,99]}}
+
+do_execsql_test json_replace_array_out_of_bounds {
+    SELECT json_replace('[1, 2, 3]', '$[5]', 99)
+} {{[1,2,3]}}
+
+do_execsql_test json_replace_entire_array {
+    SELECT json_replace('[1, 2, 3]', '$', '{"replaced": true}')
+} {{"{\"replaced\": true}"}}
+
+# Nested structures
+do_execsql_test json_replace_nested_object {
+    SELECT json_replace('{"user": {"name": "Alice", "age": 30}}', '$.user.age', 31)
+} {{{"user":{"name":"Alice","age":31}}}}
+
+do_execsql_test json_replace_nested_array {
+    SELECT json_replace('{"data": [10, 20, 30]}', '$.data[1]', 99)
+} {{{"data":[10,99,30]}}}
+
+do_execsql_test json_replace_deep_nesting {
+    SELECT json_replace(
+        '{"level1": {"level2": {"level3": {"value": 0}}}}',
+        '$.level1.level2.level3.value',
+        42
+    )
+} {{{"level1":{"level2":{"level3":{"value":42}}}}}}
+
+# Edge cases
+do_execsql_test json_replace_empty_object {
+    SELECT json_replace('{}', '$.anything', 42)
+} {{{}}}
+
+do_execsql_test json_replace_empty_array {
+    SELECT json_replace('[]', '$[0]', 42)
+} {{[]}}
+
+do_execsql_test json_replace_quoted_key {
+    SELECT json_replace('{"key.with.dots": 1}', '$."key.with.dots"', 42)
+} {{{"key.with.dots":42}}}
+
+do_execsql_test json_replace_root {
+    SELECT json_replace('{"old": "value"}', '$', '{"new": "object"}')
+} {{"{\"new\": \"object\"}"}}
+
+do_execsql_test json_replace_types_boolean {
+    SELECT typeof(json_extract(json_replace('{"flag": null}', '$.flag', 1=1), '$.flag'))
+} {{integer}}
+
+do_execsql_test json_replace_types_integer {
+    SELECT typeof(json_extract(json_replace('{"num": "text"}', '$.num', 42), '$.num'))
+} {{integer}}
+
+do_execsql_test json_replace_types_real {
+    SELECT typeof(json_extract(json_replace('{"num": 1}', '$.num', 3.14), '$.num'))
+} {{real}}
+
+do_execsql_test json_replace_types_text {
+    SELECT typeof(json_extract(json_replace('{"val": 1}', '$.val', 'text'), '$.val'))
+} {{text}}
+
+# Tests for json_remove() function
+
+# Basic removal tests
+do_execsql_test json_remove_basic_1 {
+    SELECT json_remove('{"a": 1, "b": 2, "c": 3}', '$.b')
+} {{{"a":1,"c":3}}}
+
+do_execsql_test json_remove_basic_2 {
+    SELECT json_remove('{"a": 1, "b": 2}', '$.c')
+} {{{"a":1,"b":2}}}
+
+do_execsql_test json_remove_multiple_paths {
+    SELECT json_remove('{"a": 1, "b": 2, "c": 3, "d": 4}', '$.a', '$.c')
+} {{{"b":2,"d":4}}}
+
+# Array tests
+do_execsql_test json_remove_array_element {
+    SELECT json_remove('[1, 2, 3, 4]', '$[1]')
+} {{[1,3,4]}}
+
+do_execsql_test json_remove_array_negative_index {
+    SELECT json_remove('[1, 2, 3, 4]', '$[#-1]')
+} {{[1,2,3]}}
+
+do_execsql_test json_remove_array_multiple_elements {
+    SELECT json_remove('[0, 1, 2, 3, 4, 5]', '$[1]', '$[3]')
+} {{[0,2,3,5]}}
+
+do_execsql_test json_remove_array_out_of_bounds {
+    SELECT json_remove('[1, 2, 3]', '$[5]')
+} {{[1,2,3]}}
+
+# Nested structures
+do_execsql_test json_remove_nested_object {
+    SELECT json_remove('{"user": {"name": "Alice", "age": 30, "email": "alice@example.com"}}', '$.user.email')
+} {{{"user":{"name":"Alice","age":30}}}}
+
+do_execsql_test json_remove_nested_array {
+    SELECT json_remove('{"data": [10, 20, 30, 40]}', '$.data[2]')
+} {{{"data":[10,20,40]}}}
+
+do_execsql_test json_remove_deep_nesting {
+    SELECT json_remove(
+        '{"level1": {"level2": {"level3": {"a": 1, "b": 2, "c": 3}}}}',
+        '$.level1.level2.level3.b'
+    )
+} {{{"level1":{"level2":{"level3":{"a":1,"c":3}}}}}}
+
+# Edge cases
+do_execsql_test json_remove_empty_object {
+    SELECT json_remove('{}', '$.anything')
+} {{{}}}
+
+do_execsql_test json_remove_empty_array {
+    SELECT json_remove('[]', '$[0]')
+} {{[]}}
+
+do_execsql_test json_remove_quoted_key {
+    SELECT json_remove('{"key.with.dots": 1, "normal": 2}', '$."key.with.dots"')
+} {{{"normal":2}}}
+
+do_execsql_test json_remove_all_properties {
+    SELECT json_remove('{"a": 1, "b": 2}', '$.a', '$.b')
+} {{{}}}
+
+do_execsql_test json_remove_all_array_elements {
+    SELECT json_remove('[1, 2, 3]', '$[0]', '$[0]', '$[0]')
+} {{[]}}
+
+do_execsql_test json_remove_root {
+    SELECT json_remove('{"a": 1}', '$')
+} {}
+
+# Complex example tests
+
+do_execsql_test json_remove_complex_1 {
+    SELECT json_remove(
+        '{"store": {"book": [
+            {"category": "fiction", "author": "Herman Melville", "title": "Moby Dick", "price": 8.99},
+            {"category": "fiction", "author": "J. R. R. Tolkien", "title": "The Lord of the Rings", "price": 22.99}
+        ], "bicycle": {"color": "red", "price": 19.95}}}',
+        '$.store.book[0].price',
+        '$.store.bicycle'
+    )
+} {{{"store":{"book":[{"category":"fiction","author":"Herman Melville","title":"Moby Dick"},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","price":22.99}]}}}}
+
+do_execsql_test json_replace_complex_1 {
+    SELECT json_replace(
+        '{"store": {"book": [
+            {"category": "fiction", "author": "Herman Melville", "title": "Moby Dick", "price": 8.99},
+            {"category": "fiction", "author": "J. R. R. Tolkien", "title": "The Lord of the Rings", "price": 22.99}
+        ], "bicycle": {"color": "red", "price": 19.95}}}',
+        '$.store.book[0].price', 10.99,
+        '$.store.bicycle.color', 'blue',
+        '$.store.book[1].title', 'The Hobbit'
+    )
+} {{{"store":{"book":[{"category":"fiction","author":"Herman Melville","title":"Moby Dick","price":10.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Hobbit","price":22.99}],"bicycle":{"color":"blue","price":19.95}}}}}
+
+# Combination of replace and remove
+do_execsql_test json_replace_after_remove {
+    SELECT json_replace(json_remove('{"a": 1, "b": 2, "c": 3}', '$.a'), '$.b', 42)
+} {{{"b":42,"c":3}}}
+
+do_execsql_test json_remove_after_replace {
+    SELECT json_remove(json_replace('{"a": 1, "b": 2, "c": 3}', '$.b', 42), '$.c')
+} {{{"a":1,"b":42}}}
+
+# Tests for idempotence
+do_execsql_test json_replace_idempotence {
+    SELECT json_replace('{"a": 1}', '$.a', 1)
+} {{{"a":1}}}
+
+do_execsql_test json_remove_idempotence {
+    SELECT json_remove(json_remove('{"a": 1, "b": 2}', '$.a'), '$.a')
+} {{{"b":2}}}
+
+# Compare with extracted values
+do_execsql_test json_remove_with_extract {
+    SELECT json_extract(json_remove('{"a": 1, "b": 2, "c": {"d": 3}}', '$.b'), '$.c.d')
+} {{3}}
+
+do_execsql_test json_replace_with_extract {
+    SELECT json_extract(json_replace('{"a": 1, "b": 2}', '$.a', 42), '$.a')
+} {{42}}
+
+# Check for consistency between -> operator and json_extract after mutations
+do_execsql_test json_replace_with_arrow {
+    SELECT json_replace('{"a": 1, "b": 2}', '$.a', 42) -> '$.a'
+} {{42}}
+
+do_execsql_test json_remove_with_arrow {
+    SELECT json_remove('{"a": 1, "b": {"c": 3}}', '$.a') -> '$.b.c'
+} {{3}}
+
 # Escape character tests in sqlite source depend on json_valid and in some syntax that is not implemented
 # yet in limbo.
 # See https://github.com/sqlite/sqlite/blob/255548562b125e6c148bb27d49aaa01b2fe61dba/test/json102.test#L690