github-starred/ollama
2
0
Fork 0
mirror of https://github.com/ollama/ollama.git synced 2026-05-06 16:11:34 -05:00
Code Issues 14.5k Packages Projects Releases 120 Wiki Activity

[GH-ISSUE #10937] JSON format schema ignored on /v1/ endpoint #7200

New Issue
Closed
opened 2026-04-12 19:11:51 -05:00 by GiteaMirror · 2 comments
GiteaMirror commented 2026-04-12 19:11:51 -05:00
Owner
Copy Link

Originally created by @ponychicken on GitHub (Jun 1, 2025).
Original GitHub issue: https://github.com/ollama/ollama/issues/10937

What is the issue?

What is the issue?

The JSON schema , or at least the "format": "date-time" does not work on the v1 endpoint.

Reproduction Steps

curl http://localhost:11434/v1/chat/completions -d '{
  "model": "gemma3:1b", 
  "messages": [
    {
      "role": "user",
      "content": "Here is some event info: The meeting is scheduled for Thursday (20th October 2025) afternoon. Please provide a JSON object with the event name and the date (human readable) of the meeting."
    }
  ],
  "response_format": {
    "type": "json_object",
    "schema": {
      "type": "object",
      "properties": {
        "event": { "type": "string" },
        "date": {
          "type": "string",
          "format": "date-time"
        }
      },
      "required": ["event", "date"]
    }
  },
  "stream": false
}'

Actual Output

{"event_name": "Meeting", "date": "20th October 2025"}

Expected Output

{"event": "Meeting", "date": "2025-10-20T14:00:00Z"}

Environment

  • Ollama API endpoint
  • Model: gemma3:4b
  • Date: 2025-06-01

Notes

I am not prompting the model to output ISO to make the bug more apparent. It also happens when asking for ISO strings but less often.

Relevant log output

No relevant output.

OS

macOS

GPU

Apple

CPU

Apple

Ollama version

0.9.0

Relevant log output

OS

No response

GPU

No response

CPU

No response

Ollama version

No response

Originally created by @ponychicken on GitHub (Jun 1, 2025). Original GitHub issue: https://github.com/ollama/ollama/issues/10937 ### What is the issue? ### What is the issue? The JSON schema , or at least the "format": "date-time" does not work on the v1 endpoint. ## Reproduction Steps ```bash curl http://localhost:11434/v1/chat/completions -d '{ "model": "gemma3:1b", "messages": [ { "role": "user", "content": "Here is some event info: The meeting is scheduled for Thursday (20th October 2025) afternoon. Please provide a JSON object with the event name and the date (human readable) of the meeting." } ], "response_format": { "type": "json_object", "schema": { "type": "object", "properties": { "event": { "type": "string" }, "date": { "type": "string", "format": "date-time" } }, "required": ["event", "date"] } }, "stream": false }' ``` ## Actual Output ```json {"event_name": "Meeting", "date": "20th October 2025"} ``` ## Expected Output ```json {"event": "Meeting", "date": "2025-10-20T14:00:00Z"} ``` ## Environment - Ollama API endpoint - Model: gemma3:4b - Date: 2025-06-01 ## Notes I am not prompting the model to output ISO to make the bug more apparent. It also happens when asking for ISO strings but less often. ### Relevant log output ```shell No relevant output. ``` ### OS macOS ### GPU Apple ### CPU Apple ### Ollama version 0.9.0 ### Relevant log output ```shell ``` ### OS _No response_ ### GPU _No response_ ### CPU _No response_ ### Ollama version _No response_
GiteaMirror added the bug label 2026-04-12 19:11:51 -05:00
GiteaMirror commented 2026-04-12 19:11:52 -05:00
Author
Owner
Copy Link

@mlaihk commented on GitHub (Jun 2, 2025):

I also noticed that non-native tool calling LLMs are working a lot worse in open webui in terms of invoking tools. This is probably why.....

<!-- gh-comment-id:2928173417 --> @mlaihk commented on GitHub (Jun 2, 2025): I also noticed that non-native tool calling LLMs are working a lot worse in open webui in terms of invoking tools. This is probably why.....
GiteaMirror commented 2026-04-12 19:11:52 -05:00
Author
Owner
Copy Link

@rick-github commented on GitHub (Jun 3, 2025):

--- ./10937.sh.orig	2025-06-03 03:10:32.272624315 +0200
+++ ./10937.sh	2025-06-03 03:10:15.537367732 +0200
@@ -9,17 +9,18 @@
     }
   ],
   "response_format": {
-    "type": "json_object",
-    "schema": {
-      "type": "object",
-      "properties": {
-        "event": { "type": "string" },
-        "date": {
-          "type": "string",
-          "format": "date-time"
-        }
-      },
-      "required": ["event", "date"]
+    "type": "json_schema",
+    "json_schema": {
+      "schema": {
+        "properties": {
+          "event": { "type": "string" },
+          "date": {
+            "type": "string",
+            "format": "date-time"
+          }
+        },
+        "required": ["event", "date"]
+      }
     }
   },
   "stream": false

$ ./10937.sh | jq -r '.choices[].message.content'
{"event": "Meeting", "date": "2025-10-20T14:00:00Z"}
<!-- gh-comment-id:2933032200 --> @rick-github commented on GitHub (Jun 3, 2025): ```diff --- ./10937.sh.orig 2025-06-03 03:10:32.272624315 +0200 +++ ./10937.sh 2025-06-03 03:10:15.537367732 +0200 @@ -9,17 +9,18 @@ } ], "response_format": { - "type": "json_object", - "schema": { - "type": "object", - "properties": { - "event": { "type": "string" }, - "date": { - "type": "string", - "format": "date-time" - } - }, - "required": ["event", "date"] + "type": "json_schema", + "json_schema": { + "schema": { + "properties": { + "event": { "type": "string" }, + "date": { + "type": "string", + "format": "date-time" + } + }, + "required": ["event", "date"] + } } }, "stream": false ``` ```console $ ./10937.sh | jq -r '.choices[].message.content' {"event": "Meeting", "date": "2025-10-20T14:00:00Z"} ```
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels
amd
api
app
bug
build
cli
cloud
compatibility
context-length
create
docker
documentation
embeddings
feature request
feedback wanted
good first issue
gpt-oss
gpu
harmony
help wanted
image
install
intel
js
launch
linux
macos
memory
mlx
model
needs more info
networking
nvidia
ollama.com
performance
pull-request
Mirrored from GitHub Pull Request
 python
question
registry
rendering
thinking
tools
top
vulkan
windows
wsl
No Label bug
Milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
GiteaMirror ninjasurge
No Assignees
1 Participants
Notifications
Due Date
No due date set.
Dependencies

No dependencies set.

Reference: github-starred/ollama#7200
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?