diff --git a/tests/unit/engines/test_json_engine.py b/tests/unit/engines/test_json_engine.py
new file mode 100644
index 000000000..0fb3da122
--- /dev/null
+++ b/tests/unit/engines/test_json_engine.py
@@ -0,0 +1,254 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# pylint: disable=missing-module-docstring
+
+from collections import defaultdict
+import mock
+
+from searx.engines import json_engine
+from searx import logger
+
+from tests import SearxTestCase
+
+logger = logger.getChild('engines')
+
+
+class TestJsonEngine(SearxTestCase):  # pylint: disable=missing-class-docstring
+    json = """
+    [
+        {
+            "title": "title0",
+            "content": "content0",
+            "url": "https://example.com/url0",
+            "images": [
+                {
+                    "thumb": "https://example.com/thumb00"
+                },
+                {
+                    "thumb": "https://example.com/thumb01"
+                }
+            ]
+        },
+        {
+            "title": "<h1>title1</h1>",
+            "content": "<h2>content1</h2>",
+            "url": "https://example.com/url1",
+            "images": [
+                {
+                    "thumb": "https://example.com/thumb10"
+                },
+                {
+                    "thumb": "https://example.com/thumb11"
+                }
+            ]
+        },
+        {
+            "title": "title2",
+            "content": "content2",
+            "url": 2,
+            "images": [
+                {
+                    "thumb": "thumb20"
+                },
+                {
+                    "thumb": 21
+                }
+            ]
+        }
+    ]
+    """
+
+    json_result_query = """
+    {
+        "data": {
+            "results": [
+                {
+                    "title": "title0",
+                    "content": "content0",
+                    "url": "https://example.com/url0",
+                    "images": [
+                        {
+                            "thumb": "https://example.com/thumb00"
+                        },
+                        {
+                            "thumb": "https://example.com/thumb01"
+                        }
+                    ]
+                },
+                {
+                    "title": "<h1>title1</h1>",
+                    "content": "<h2>content1</h2>",
+                    "url": "https://example.com/url1",
+                    "images": [
+                        {
+                            "thumb": "https://example.com/thumb10"
+                        },
+                        {
+                            "thumb": "https://example.com/thumb11"
+                        }
+                    ]
+                },
+                {
+                    "title": "title2",
+                    "content": "content2",
+                    "url": 2,
+                    "images": [
+                        {
+                            "thumb": "thumb20"
+                        },
+                        {
+                            "thumb": 21
+                        }
+                    ]
+                }
+            ],
+            "suggestions": [
+                "suggestion0",
+                "suggestion1"
+            ]
+        }
+    }
+    """
+
+    def setUp(self):
+        json_engine.logger = logger.getChild('test_json_engine')
+
+    def test_request(self):
+        json_engine.search_url = 'https://example.com/{query}'
+        json_engine.categories = []
+        json_engine.paging = False
+        query = 'test_query'
+        dicto = defaultdict(dict)
+        dicto['language'] = 'all'
+        dicto['pageno'] = 1
+        params = json_engine.request(query, dicto)
+        self.assertIn('url', params)
+        self.assertEqual('https://example.com/test_query', params['url'])
+
+        json_engine.search_url = 'https://example.com/q={query}&p={pageno}'
+        json_engine.paging = True
+        query = 'test_query'
+        dicto = defaultdict(dict)
+        dicto['language'] = 'all'
+        dicto['pageno'] = 1
+        params = json_engine.request(query, dicto)
+        self.assertIn('url', params)
+        self.assertEqual('https://example.com/q=test_query&p=1', params['url'])
+
+        json_engine.search_url = 'https://example.com/'
+        json_engine.paging = True
+        json_engine.request_body = '{{"page": {pageno}, "query": "{query}"}}'
+        query = 'test_query'
+        dicto = defaultdict(dict)
+        dicto['language'] = 'all'
+        dicto['pageno'] = 1
+        params = json_engine.request(query, dicto)
+        self.assertIn('data', params)
+        self.assertEqual('{"page": 1, "query": "test_query"}', params['data'])
+
+    def test_response(self):
+        # without results_query
+        json_engine.results_query = ''
+        json_engine.url_query = 'url'
+        json_engine.url_prefix = ''
+        json_engine.title_query = 'title'
+        json_engine.content_query = 'content'
+        json_engine.thumbnail_query = 'images/thumb'
+        json_engine.thumbnail_prefix = ''
+        json_engine.title_html_to_text = False
+        json_engine.content_html_to_text = False
+        json_engine.categories = []
+
+        self.assertRaises(AttributeError, json_engine.response, None)
+        self.assertRaises(AttributeError, json_engine.response, [])
+        self.assertRaises(AttributeError, json_engine.response, '')
+        self.assertRaises(AttributeError, json_engine.response, '[]')
+
+        response = mock.Mock(text='{}', status_code=200)
+        self.assertEqual(json_engine.response(response), [])
+
+        response = mock.Mock(text=self.json, status_code=200)
+        results = json_engine.response(response)
+        self.assertEqual(type(results), list)
+        self.assertEqual(len(results), 3)
+        self.assertEqual(results[0]['title'], 'title0')
+        self.assertEqual(results[0]['url'], 'https://example.com/url0')
+        self.assertEqual(results[0]['content'], 'content0')
+        self.assertEqual(results[0]['thumbnail'], 'https://example.com/thumb00')
+        self.assertEqual(results[1]['title'], '<h1>title1</h1>')
+        self.assertEqual(results[1]['url'], 'https://example.com/url1')
+        self.assertEqual(results[1]['content'], '<h2>content1</h2>')
+        self.assertEqual(results[1]['thumbnail'], 'https://example.com/thumb10')
+
+        # with prefix and suggestions without results_query
+        json_engine.url_prefix = 'https://example.com/url'
+        json_engine.thumbnail_query = 'images/1/thumb'
+        json_engine.thumbnail_prefix = 'https://example.com/thumb'
+
+        results = json_engine.response(response)
+        self.assertEqual(type(results), list)
+        self.assertEqual(len(results), 3)
+        self.assertEqual(results[2]['title'], 'title2')
+        self.assertEqual(results[2]['url'], 'https://example.com/url2')
+        self.assertEqual(results[2]['content'], 'content2')
+        self.assertEqual(results[2]['thumbnail'], 'https://example.com/thumb21')
+        self.assertFalse(results[0].get('is_onion', False))
+
+        # results are onion urls without results_query
+        json_engine.categories = ['onions']
+        results = json_engine.response(response)
+        self.assertTrue(results[0]['is_onion'])
+
+    def test_response_results_json(self):
+        # with results_query
+        json_engine.results_query = 'data/results'
+        json_engine.url_query = 'url'
+        json_engine.url_prefix = ''
+        json_engine.title_query = 'title'
+        json_engine.content_query = 'content'
+        json_engine.thumbnail_query = 'images/1/thumb'
+        json_engine.thumbnail_prefix = ''
+        json_engine.title_html_to_text = True
+        json_engine.content_html_to_text = True
+        json_engine.categories = []
+
+        self.assertRaises(AttributeError, json_engine.response, None)
+        self.assertRaises(AttributeError, json_engine.response, [])
+        self.assertRaises(AttributeError, json_engine.response, '')
+        self.assertRaises(AttributeError, json_engine.response, '[]')
+
+        response = mock.Mock(text='{}', status_code=200)
+        self.assertEqual(json_engine.response(response), [])
+
+        response = mock.Mock(text=self.json_result_query, status_code=200)
+        results = json_engine.response(response)
+        self.assertEqual(type(results), list)
+        self.assertEqual(len(results), 3)
+        self.assertEqual(results[0]['title'], 'title0')
+        self.assertEqual(results[0]['url'], 'https://example.com/url0')
+        self.assertEqual(results[0]['content'], 'content0')
+        self.assertEqual(results[0]['thumbnail'], 'https://example.com/thumb01')
+        self.assertEqual(results[1]['title'], 'title1')
+        self.assertEqual(results[1]['url'], 'https://example.com/url1')
+        self.assertEqual(results[1]['content'], 'content1')
+        self.assertEqual(results[1]['thumbnail'], 'https://example.com/thumb11')
+
+        # with prefix and suggestions with results_query
+        json_engine.url_prefix = 'https://example.com/url'
+        json_engine.thumbnail_query = 'images/1/thumb'
+        json_engine.thumbnail_prefix = 'https://example.com/thumb'
+        json_engine.suggestion_query = 'data/suggestions'
+
+        results = json_engine.response(response)
+        self.assertEqual(type(results), list)
+        self.assertEqual(len(results), 4)
+        self.assertEqual(results[2]['title'], 'title2')
+        self.assertEqual(results[2]['url'], 'https://example.com/url2')
+        self.assertEqual(results[2]['content'], 'content2')
+        self.assertEqual(results[2]['thumbnail'], 'https://example.com/thumb21')
+        self.assertEqual(results[3]['suggestion'], ['suggestion0', 'suggestion1'])
+        self.assertFalse(results[0].get('is_onion', False))
+
+        # results are onion urls with results_query
+        json_engine.categories = ['onions']
+        results = json_engine.response(response)
+        self.assertTrue(results[0]['is_onion'])