Webhooks

Webhooks are a foundation for MLOps-related features. They allow you to listen for new changes on specific repos or to all repos belonging to particular set of users/organizations (not just your repos, but any repo).

You can use them to auto-convert models, build community bots, or build CI/CD for your models, datasets, and Spaces (and much more!).

The documentation for Webhooks is below – or you can also browse our guides showcasing a few possible use cases of Webhooks:

• Fine-tune a new model whenever a dataset gets updated (Python)
• Create a discussion bot on the Hub, using a LLM API (NodeJS)
• Create metadata quality reports (Python)
• and more to come…

Create your Webhook

You can create new Webhooks and edit existing ones in your Webhooks settings:

Webhooks can watch for repos updates, Pull Requests, discussions, and new comments. It’s even possible to create a Space to react to your Webhooks!

Webhook Payloads

After registering a Webhook, you will be notified of new events via an HTTP POST call on the specified target URL. The payload is encoded in JSON.

You can view the history of payloads sent in the activity tab of the webhook settings page, it’s also possible to replay past webhooks for easier debugging:

As an example, here is the full payload when a Pull Request is opened:

{
  "event": {
    "action": "create",
    "scope": "discussion"
  },
  "repo": {
    "type": "model",
    "name": "openai-community/gpt2",
    "id": "621ffdc036468d709f17434d",
    "private": false,
    "url": {
      "web": "https://huggingface.co./openai-community/gpt2",
      "api": "https://huggingface.co./api/models/openai-community/gpt2"
    },
    "owner": {
      "id": "628b753283ef59b5be89e937"
    }
  },
  "discussion": {
    "id": "6399f58518721fdd27fc9ca9",
    "title": "Update co2 emissions",
    "url": {
      "web": "https://huggingface.co./openai-community/gpt2/discussions/19",
      "api": "https://huggingface.co./api/models/openai-community/gpt2/discussions/19"
    },
    "status": "open",
    "author": {
      "id": "61d2f90c3c2083e1c08af22d"
    },
    "num": 19,
    "isPullRequest": true,
    "changes": {
      "base": "refs/heads/main"
    }
  },
  "comment": {
    "id": "6399f58518721fdd27fc9caa",
    "author": {
      "id": "61d2f90c3c2083e1c08af22d"
    },
    "content": "Add co2 emissions information to the model card",
    "hidden": false,
    "url": {
      "web": "https://huggingface.co./openai-community/gpt2/discussions/19#6399f58518721fdd27fc9caa"
    }
  },
  "webhook": {
    "id": "6390e855e30d9209411de93b",
    "version": 3
  }
}

Event

The top-level properties event is always specified and used to determine the nature of the event.

It has two sub-properties: event.action and event.scope.

event.scope will be one of the following values:

• "repo" - Global events on repos. Possible values for the associated action: "create", "delete", "update", "move".
• "repo.content" - Events on the repo’s content, such as new commits or tags. It triggers on new Pull Requests as well due to the newly created reference/commit. The associated action is always "update".
• "repo.config" - Events on the config: update Space secrets, update settings, update DOIs, disabled or not, etc. The associated action is always "update".
• "discussion" - Creating a discussion or Pull Request, updating the title or status, and merging. Possible values for the associated action: "create", "delete", "update".
• "discussion.comment" - Creating, updating, and hiding a comment. Possible values for the associated action: "create", "update".

More scopes can be added in the future. To handle unknown events, your webhook handler can consider any action on a narrowed scope to be an "update" action on the broader scope.

For example, if the "repo.config.dois" scope is added in the future, any event with that scope can be considered by your webhook handler as an "update" action on the "repo.config" scope.

Repo

In the current version of webhooks, the top-level property repo is always specified, as events can always be associated with a repo. For example, consider the following value:

"repo": {
	"type": "model",
	"name": "some-user/some-repo",
	"id": "6366c000a2abcdf2fd69a080",
	"private": false,
	"url": {
		"web": "https://huggingface.co./some-user/some-repo",
		"api": "https://huggingface.co./api/models/some-user/some-repo"
	},
	"headSha": "c379e821c9c95d613899e8c4343e4bfee2b0c600",
	"tags": [
		"license:other",
		"has_space"
	],
	"owner": {
		"id": "61d2000c3c2083e1c08af22d"
	}
}

repo.headSha is the sha of the latest commit on the repo’s main branch. It is only sent when event.scope starts with "repo", not on community events like discussions and comments.

Code changes

On code changes, the top-level property updatedRefs is specified on repo events. It is an array of references that have been updated. Here is an example value:

"updatedRefs": [
  {
    "ref": "refs/heads/main",
    "oldSha": "ce9a4674fa833a68d5a73ec355f0ea95eedd60b7",
    "newSha": "575db8b7a51b6f85eb06eee540738584589f131c"
  },
  {
    "ref": "refs/tags/test",
    "oldSha": null,
    "newSha": "575db8b7a51b6f85eb06eee540738584589f131c"
  }
]

Newly created references will have oldSha set to null. Deleted references will have newSha set to null.

You can react to new commits on specific pull requests, new tags, or new branches.

Discussions and Pull Requests

The top-level property discussion is specified on community events (discussions and Pull Requests). The discussion.isPullRequest property is a boolean indicating if the discussion is also a Pull Request (on the Hub, a PR is a special type of discussion). Here is an example value:

"discussion": {
	"id": "639885d811ae2bad2b7ba461",
	"title": "Hello!",
	"url": {
		"web": "https://huggingface.co./some-user/some-repo/discussions/3",
		"api": "https://huggingface.co./api/models/some-user/some-repo/discussions/3"
	},
	"status": "open",
	"author": {
		"id": "61d2000c3c2083e1c08af22d"
	},
	"isPullRequest": true,
	"changes": {
		"base": "refs/heads/main"
	}
	"num": 3
}

Comment

The top level property comment is specified when a comment is created (including on discussion creation) or updated. Here is an example value:

"comment": {
	"id": "6398872887bfcfb93a306f18",
	"author": {
		"id": "61d2000c3c2083e1c08af22d"
	},
	"content": "This adds an env key",
	"hidden": false,
	"url": {
		"web": "https://huggingface.co./some-user/some-repo/discussions/4#6398872887bfcfb93a306f18"
	}
}

Webhook secret

Setting a Webhook secret is useful to make sure payloads sent to your Webhook handler URL are actually from Hugging Face.

If you set a secret for your Webhook, it will be sent along as an X-Webhook-Secret HTTP header on every request. Only ASCII characters are supported.

Rate limiting

Each Webhook is limited to 1,000 triggers per 24 hours. You can view your usage in the Webhook settings page in the “Activity” tab.

If you need to increase the number of triggers for your Webhook, contact us at [email protected].

Developing your Webhooks

If you do not have an HTTPS endpoint/URL, you can try out public tools for webhook testing. These tools act as catch-all (capture all requests) sent to them and give 200 OK status code. Beeceptor is one tool you can use to create a temporary HTTP endpoint and review the incoming payload. Another such tool is Webhook.site.

Additionally, you can route a real Webhook payload to the code running locally on your machine during development. This is a great way to test and debug for faster integrations. You can do this by exposing your localhost port to the Internet. To be able to go this path, you can use ngrok or localtunnel.

Debugging Webhooks

You can easily find recently generated events for your webhooks. Open the activity tab for your webhook. There you will see the list of recent events.

Here you can review the HTTP status code and the payload of the generated events. Additionally, you can replay these events by clicking on the Replay button!

Note: When changing the target URL or secret of a Webhook, replaying an event will send the payload to the updated URL.

FAQ

Can I define webhooks on my organization vs my user account?

No, this is not currently supported.

How can I subscribe to events on all repos (or across a whole repo type, like on all models)?

This is not currently exposed to end users but we can toggle this for you if you send an email to [email protected].