diff --git a/.gitignore b/.gitignore
index 142fc9f..71ed06e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 # Output files
 contributors.md
+contributors.json
 
 # Byte-compiled / optimized / DLL files
 __pycache__/
diff --git a/contributors.py b/contributors.py
index a074689..6518fbc 100644
--- a/contributors.py
+++ b/contributors.py
@@ -6,6 +6,7 @@
 import auth
 import contributor_stats
 import env
+import json_writer
 import markdown
 
 
@@ -72,7 +73,16 @@ def main():
         sponsor_info,
         link_to_profile,
     )
-    # write_to_json(contributors)
+    json_writer.write_to_json(
+        filename="contributors.json",
+        start_date=start_date,
+        end_date=end_date,
+        organization=organization,
+        repository_list=repository_list,
+        sponsor_info=sponsor_info,
+        link_to_profile=link_to_profile,
+        contributors=contributors,
+    )
 
 
 def get_all_contributors(
diff --git a/json_writer.py b/json_writer.py
new file mode 100644
index 0000000..85dc607
--- /dev/null
+++ b/json_writer.py
@@ -0,0 +1,78 @@
+""" This module contains a function that writes data to a JSON file. """
+
+import json
+
+
+def write_to_json(
+    contributors,
+    filename,
+    start_date,
+    end_date,
+    organization,
+    repository_list,
+    sponsor_info,
+    link_to_profile,
+):
+    """Write data to a JSON file.
+
+    Args:
+        contributors (list): A list of Contributor objects.
+        filename (str): The name of the JSON file.
+        start_date (str): The start date of the date range for the contributor list.
+        end_date (str): The end date of the date range for the contributor list.
+        organization (str): The organization for which the contributors are being listed.
+        repository_list (list): A list of repositories for which the contributors are being listed.
+        sponsor_info (str): A string indicating whether sponsor information should be included.
+        link_to_profile (str): A string indicating whether a link to the contributor's profile should be included.
+
+    Returns:
+        None
+    """
+
+    # Prepare data for JSON such that it looks like the markdown data. ie.
+    # {
+    #     "start_date": "2024-03-08",
+    #     "end_date": "2024-03-15",
+    #     "organization": null,
+    #     "repository_list": [
+    #         "github/stale-repos",
+    #         "github/issue-metrics",
+    #         "github/contributors",
+    #         "github/automatic-contrib-prs",
+    #         "github/evergreen",
+    #         "github/cleanowners"
+    #     ],
+    #     "sponsor_info": false,
+    #     "link_to_profile": false,
+    #     "contributors": [
+    #         {
+    #             "username": "zkoppert",
+    #             "new_contributor": false,
+    #             "avatar_url": "https://avatars.githubusercontent.com/u/6935431?v=4",
+    #             "contribution_count": 785,
+    #             "commit_url": "https://github.com/github/stale-repos/commits?author=zkoppert&since=2024-03-08&until=2024-03-15,
+    #             "sponsor_info": ""
+    #         },
+    #         {
+    #             "username": "jmeridth",
+    #             "new_contributor": false,
+    #             "avatar_url": "https://avatars.githubusercontent.com/u/35014?v=4",
+    #             "contribution_count": 94,
+    #             "commit_url": "https://github.com/github/stale-repos/commits?author=jmeridth&since=2024-03-08&until=2024-03-15,
+    #             "sponsor_info": ""
+    #         }
+    #     ]
+    # }
+    data = {
+        "start_date": start_date,
+        "end_date": end_date,
+        "organization": organization,
+        "repository_list": repository_list,
+        "sponsor_info": sponsor_info,
+        "link_to_profile": link_to_profile,
+        "contributors": [contributor.__dict__ for contributor in contributors],
+    }
+
+    # Write data to a JSON file
+    with open(filename, "w", encoding="utf-8") as f:
+        json.dump(data, f, indent=4)
diff --git a/test_json_writer.py b/test_json_writer.py
new file mode 100644
index 0000000..1071ea1
--- /dev/null
+++ b/test_json_writer.py
@@ -0,0 +1,68 @@
+""" Test the write_to_json function in json_writer.py. """
+
+import json
+import os
+import unittest
+
+from contributor_stats import ContributorStats
+from json_writer import write_to_json
+
+
+class TestWriteToJson(unittest.TestCase):
+    """Test the write_to_json function."""
+
+    def setUp(self):
+        """Set up data for the tests."""
+        self.filename = "test.json"
+        self.data = {
+            "start_date": "2022-01-01",
+            "end_date": "2022-01-31",
+            "organization": "test_org",
+            "repository_list": ["repo1", "repo2"],
+            "sponsor_info": False,
+            "link_to_profile": False,
+            "contributors": [
+                {
+                    "username": "test_user",
+                    "new_contributor": False,
+                    "avatar_url": "https://test_url.com",
+                    "contribution_count": 10,
+                    "commit_url": "https://test_commit_url.com",
+                    "sponsor_info": "",
+                }
+            ],
+        }
+
+    def test_write_to_json(self):
+        """Test that write_to_json writes the correct data to a JSON file."""
+        contributors = (
+            ContributorStats(
+                username="test_user",
+                new_contributor=False,
+                avatar_url="https://test_url.com",
+                contribution_count=10,
+                commit_url="https://test_commit_url.com",
+                sponsor_info="",
+            ),
+        )
+
+        write_to_json(
+            contributors=contributors,
+            filename=self.filename,
+            start_date=self.data["start_date"],
+            end_date=self.data["end_date"],
+            organization=self.data["organization"],
+            repository_list=self.data["repository_list"],
+            sponsor_info=self.data["sponsor_info"],
+            link_to_profile=self.data["link_to_profile"],
+        )
+        with open(self.filename, "r", encoding="utf-8") as f:
+            result = json.load(f)
+        self.assertDictEqual(result, self.data)
+
+    def tearDown(self):
+        os.remove(self.filename)
+
+
+if __name__ == "__main__":
+    unittest.main()