diff --git a/datasette/stored_queries.py b/datasette/stored_queries.py
index a6123daa..d7e1ec99 100644
--- a/datasette/stored_queries.py
+++ b/datasette/stored_queries.py
@@ -62,7 +62,6 @@ def stored_query_to_dict(query: StoredQuery) -> dict[str, Any]:
         "description_html": query.description_html,
         "hide_sql": query.hide_sql,
         "fragment": query.fragment,
-        "params": list(query.parameters),
         "parameters": list(query.parameters),
         "is_write": query.is_write,
         "is_private": query.is_private,
diff --git a/docs/json_api.rst b/docs/json_api.rst
index a561aa9c..54f0b6bd 100644
--- a/docs/json_api.rst
+++ b/docs/json_api.rst
@@ -1173,7 +1173,6 @@ The following extras are available for arbitrary SQL query responses and stored,
           "description_html": null,
           "hide_sql": false,
           "fragment": null,
-          "params": [],
           "parameters": [],
           "is_write": false,
           "is_private": false,
diff --git a/existing-api.md b/existing-api.md
index e11491fe..abb82e2c 100644
--- a/existing-api.md
+++ b/existing-api.md
@@ -990,7 +990,7 @@ stored_queries.py:55-80):
   "database": "...", "name": "...", "sql": "...",
   "title": null, "description": null, "description_html": null,
   "hide_sql": false, "fragment": null,
-  "params": ["p"], "parameters": ["p"],
+  "parameters": ["p"],
   "is_write": false, "is_private": true, "is_trusted": false,
   "source": "user", "owner_id": "...",
   "on_success_message": null, "on_success_message_sql": null,
@@ -1000,8 +1000,8 @@ stored_queries.py:55-80):
 }
 ```
 
-`params` and `parameters` are identical lists, both always present.
-`private` appears only in list responses.
+`private` appears only in list responses. On input (create/update and
+`datasette.yaml`), `params` is accepted as an alias for `parameters`.
 
 **Default permission rules for queries** (default_permissions/defaults.py):
 `view-query` is default-allow, but private queries are visible only to their
diff --git a/stable-api-recommendations.md b/stable-api-recommendations.md
index 8c3131e9..d1388549 100644
--- a/stable-api-recommendations.md
+++ b/stable-api-recommendations.md
@@ -249,9 +249,12 @@ Concerns:
 
 ## 5. Naming and parameter conventions (P2/P3)
 
-- **`params` and `parameters` are duplicate keys** in every stored-query
+- ~~**`params` and `parameters` are duplicate keys** in every stored-query
   object (stored_queries.py:55-80). Delete one before 1.0 (suggest keeping
-  `parameters`; the write side already accepts both on input).
+  `parameters`; the write side already accepts both on input).~~
+  ✅ **Done** — output objects carry only `parameters` (matching
+  `/-/query/parameters` and the analyze endpoints); `params` remains an
+  accepted input alias for API creation and `datasette.yaml` config.
 - **Three names for the same concept across error/message payloads:**
   `error`, `errors`, `message`. See §1.
 - **Boolean query parameters have at least three grammars:** `_nl=on`,
diff --git a/tests/test_queries.py b/tests/test_queries.py
index c5c1c3cd..11828c4e 100644
--- a/tests/test_queries.py
+++ b/tests/test_queries.py
@@ -3702,3 +3702,33 @@ async def test_query_delete_api_rejects_trusted_queries():
     # datasette.remove_query() remains available for internal use
     await ds.remove_query("data", "trusted_report")
     assert await ds.get_query("data", "trusted_report") is None
+
+
+@pytest.mark.asyncio
+async def test_stored_query_json_uses_parameters_not_params():
+    ds = Datasette(
+        memory=True,
+        config={
+            "databases": {
+                "data": {
+                    "queries": {
+                        "with_params": {
+                            "sql": "select :name as name, :age as age",
+                            "params": ["name", "age"],
+                        },
+                    },
+                }
+            }
+        },
+    )
+    ds.add_memory_database("query_parameters_key", name="data")
+    await ds.invoke_startup()
+
+    definition = (await ds.client.get("/data/with_params/-/definition")).json()
+    assert definition["query"]["parameters"] == ["name", "age"]
+    assert "params" not in definition["query"]
+
+    listing = (await ds.client.get("/data/-/queries.json")).json()
+    query = [q for q in listing["queries"] if q["name"] == "with_params"][0]
+    assert query["parameters"] == ["name", "age"]
+    assert "params" not in query