README

@octokit/webhooks

GitHub webhook events toolset for Node.js

Usage
Local development
API
TypeScript
- EmitterWebhookEventName
- EmitterWebhookEvent
License

@octokit/webhooks helps to handle webhook events received from GitHub.

GitHub webhooks can be registered in multiple ways

In repository or organization settings on github.com.
Using the REST API for repositories or organizations
By creating a GitHub App.

Note that while setting a secret is optional on GitHub, it is required to be set in order to use @octokit/webhooks. Content Type must be set to application/json, application/x-www-form-urlencoded is not supported.

Usage

// install with: npm install @octokit/webhooks
const { Webhooks, createNodeMiddleware } = require("@octokit/webhooks");
const webhooks = new Webhooks({
  secret: "mysecret",
});

webhooks.onAny(({ id, name, payload }) => {
  console.log(name, "event received");
});

require("http").createServer(createNodeMiddleware(webhooks)).listen(3000);
// can now receive webhook events at /api/github/webhooks

Local development

You can receive webhooks on your local machine or even browser using EventSource and smee.io.

Go to smee.io and Start a new channel. Then copy the "Webhook Proxy URL" and

enter it in the GitHub App’s "Webhook URL" input
pass it to the EventSource constructor, see below

const webhookProxyUrl = "https://smee.io/IrqK0nopGAOc847"; // replace with your own Webhook Proxy URL
const source = new EventSource(webhookProxyUrl);
source.onmessage = (event) => {
  const webhookEvent = JSON.parse(event.data);
  webhooks
    .verifyAndReceive({
      id: webhookEvent["x-request-id"],
      name: webhookEvent["x-github-event"],
      signature: webhookEvent["x-hub-signature"],
      payload: webhookEvent.body,
    })
    .catch(console.error);
};

EventSource is a native browser API and can be polyfilled for browsers that don’t support it. In node, you can use the eventsource package: install with npm install eventsource, then const EventSource = require('eventsource')

Constructor

new Webhooks({ secret /*, transform */ });

`secret` (String)	Required. Secret as configured in GitHub Settings.
`transform` (Function)	Only relevant for `webhooks.on`. Transform emitted event before calling handlers. Can be asynchronous.
`log` object	Used for internal logging. Defaults to `console` with `debug` and `info` doing nothing.

Returns the webhooks API.

webhooks.sign()

webhooks.sign(eventPayload);

eventPayload (Object) Required. Webhook request payload as received from GitHub

Returns a signature string. Throws error if eventPayload is not passed.

The sign method can be imported as static method from @octokit/webhooks-methods.

webhooks.verify()

webhooks.verify(eventPayload, signature);

`eventPayload` (Object or String)	Required. Webhook event request payload as received from GitHub.
`signature` (String)	Required. Signature string as calculated by `webhooks.sign()`.

Returns true or false. Throws error if eventPayload or signature not passed.

The verify method can be imported as static method from @octokit/webhooks-methods.

webhooks.verifyAndReceive()

webhooks.verifyAndReceive({ id, name, payload, signature });

`id` String	Unique webhook event request id
`name` String	Required. Name of the event. (Event names are set as `X-GitHub-Event` header in the webhook event request.)
`payload` Object or String	Required. Webhook event request payload as received from GitHub.
`signature` (String)	Required. Signature string as calculated by `webhooks.sign()`.

Returns a promise.

Verifies event using webhooks.verify(), then handles the event using webhooks.receive().

Additionally, if verification fails, rejects the returned promise and emits an error event.

Example

const { Webhooks } = require("@octokit/webhooks");
const webhooks = new Webhooks({
  secret: "mysecret",
});
eventHandler.on("error", handleSignatureVerificationError);

// put this inside your webhooks route handler
eventHandler
  .verifyAndReceive({
    id: request.headers["x-github-delivery"],
    name: request.headers["x-github-event"],
    payload: request.body,
    signature: request.headers["x-hub-signature-256"],
  })
  .catch(handleErrorsFromHooks);

webhooks.receive()

webhooks.receive({ id, name, payload });

`id` String	Unique webhook event request id
`name` String	Required. Name of the event. (Event names are set as `X-GitHub-Event` header in the webhook event request.)
`payload` Object	Required. Webhook event request payload as received from GitHub.

Returns a promise. Runs all handlers set with webhooks.on() in parallel and waits for them to finish. If one of the handlers rejects or throws an error, then webhooks.receive() rejects. The returned error has an .errors property which holds an array of all errors caught from the handlers. If no errors occur, webhooks.receive() resolves without passing any value.

The .receive() method belongs to the event-handler module which can be used standalone.

webhooks.on()

webhooks.on(eventName, handler);
webhooks.on(eventNames, handler);

`eventName` String	Required. Name of the event. One of GitHub's supported event names, or (if the event has an action property) the name of an event followed by its action in the form of `<event>.<action>`.
`eventNames` Array	Required. Array of event names.
`handler` Function	Required. Method to be run each time the event with the passed name is received. the `handler` function can be an async function, throw an error or return a Promise. The handler is called with an event object: `{id, name, payload}`.

The .on() method belongs to the event-handler module which can be used standalone.

webhooks.onAny()

webhooks.onAny(handler);

handler Function Required. Method to be run each time any event is received. the handler function can be an async function, throw an error or return a Promise. The handler is called with an event object: {id, name, payload}.

The .onAny() method belongs to the event-handler module which can be used standalone.

webhooks.onError()

webhooks.onError(handler);

If a webhook event handler throws an error or returns a promise that rejects, an error event is triggered. You can use this handler for logging or reporting events. The passed error object has a .event property which has all information on the event.

Asynchronous error event handler are not blocking the .receive() method from completing.

handler Function Required. Method to be run each time a webhook event handler throws an error or returns a promise that rejects. The handler function can be an async function, return a Promise. The handler is called with an error object that has a .event property which has all the information on the event: {id, name, payload}.

The .onError() method belongs to the event-handler module which can be used standalone.

webhooks.removeListener()

webhooks.removeListener(eventName, handler);
webhooks.removeListener(eventNames, handler);

`eventName` String	Required. Name of the event. One of GitHub's supported event names, or (if the event has an action property) the name of an event followed by its action in the form of `<event>.<action>`, or '*' for the `onAny()` method or 'error' for the `onError()` method.
`eventNames` Array	Required. Array of event names.
`handler` Function	Required. Method which was previously passed to `webhooks.on()`. If the same handler was registered multiple times for the same event, only the most recent handler gets removed.

The .removeListener() method belongs to the event-handler module which can be used standalone.

createNodeMiddleware()

const { createServer } = require("http");
const { Webhooks, createNodeMiddleware } = require("@octokit/webhooks");

const webhooks = new Webhooks({
  secret: "mysecret",
});

const middleware = createNodeMiddleware(webhooks, { path: "/" });

createServer(middleware).listen(3000);
// can now receive user authorization callbacks at POST /

`webhooks` Webhooks instance	Required.
`path` string	Custom path to match requests against. Defaults to `/api/github/webhooks`.
`log` object	Used for internal logging. Defaults to `console` with `debug` and `info` doing nothing.
`onUnhandledRequest` function	Defaults to `function onUnhandledRequest(request, response) { response.writeHead(400, { "content-type": "application/json", }); response.end( JSON.stringify({ error: error.message, }) ); }`

Webhook events

See the full list of event types with example payloads.

If there are actions for a webhook, events are emitted for both, the webhook name as well as a combination of the webhook name and the action, e.g. installation and installation.created.

Event	Actions
`branch_protection_rule`	`created` `deleted` `edited`
`check_run`	`completed` `created` `requested_action` `rerequested`
`check_suite`	`completed` `requested` `rerequested`
`code_scanning_alert`	`appeared_in_branch` `closed_by_user` `created` `fixed` `reopened` `reopened_by_user`
`commit_comment`	`created`
`create`
`delete`
`deploy_key`	`created` `deleted`
`deployment`	`created`
`deployment_status`	`created`
`discussion`	`answered` `category_changed` `created` `deleted` `edited` `labeled` `locked` `pinned` `transferred` `unanswered` `unlabeled` `unlocked` `unpinned`
`discussion_comment`	`created` `deleted` `edited`
`fork`
`github_app_authorization`	`revoked`
`gollum`
`installation`	`created` `deleted` `new_permissions_accepted` `suspend` `unsuspend`
`installation_repositories`	`added` `removed`
`issue_comment`	`created` `deleted` `edited`
`issues`	`assigned` `closed` `deleted` `demilestoned` `edited` `labeled` `locked` `milestoned` `opened` `pinned` `reopened` `transferred` `unassigned` `unlabeled` `unlocked` `unpinned`
`label`	`created` `deleted` `edited`
`marketplace_purchase`	`cancelled` `changed` `pending_change` `pending_change_cancelled` `purchased`
`member`	`added` `edited` `removed`
`membership`	`added` `removed`
`meta`	`deleted`
`milestone`	`closed` `created` `deleted` `edited` `opened`
`org_block`	`blocked` `unblocked`
`organization`	`deleted` `member_added` `member_invited` `member_removed` `renamed`
`package`	`published` `updated`
`page_build`
`ping`
`project`	`closed` `created` `deleted` `edited` `reopened`
`project_card`	`converted` `created` `deleted` `edited` `moved`
`project_column`	`created` `deleted` `edited` `moved`
`public`
`pull_request`	`assigned` `auto_merge_disabled` `auto_merge_enabled` `closed` `converted_to_draft` `edited` `labeled` `locked` `opened` `ready_for_review` `reopened` `review_request_removed` `review_requested` `synchronize` `unassigned` `unlabeled` `unlocked`
`pull_request_review`	`dismissed` `edited` `submitted`
`pull_request_review_comment`	`created` `deleted` `edited`
`pull_request_review_thread`	`resolved` `unresolved`
`push`
`release`	`created` `deleted` `edited` `prereleased` `published` `released` `unpublished`
`repository`	`archived` `created` `deleted` `edited` `privatized` `publicized` `renamed` `transferred` `unarchived`
`repository_dispatch`
`repository_import`
`repository_vulnerability_alert`	`create` `dismiss` `resolve`
`secret_scanning_alert`	`created` `reopened` `resolved`
`security_advisory`	`performed` `published` `updated` `withdrawn`
`sponsorship`	`cancelled` `created` `edited` `pending_cancellation` `pending_tier_change` `tier_changed`
`star`	`created` `deleted`
`status`
`team`	`added_to_repository` `created` `deleted` `edited` `removed_from_repository`
`team_add`
`watch`	`started`
`workflow_dispatch`
`workflow_job`	`completed` `in_progress` `queued` `started`
`workflow_run`	`completed` `requested`

emitterEventNames

A read only tuple containing all the possible combinations of the webhook events + actions listed above. This might be useful in GUI and input validation.

import { emitterEventNames } from "@octokit/webhooks";
emitterEventNames; // ["check_run", "check_run.completed", ...]

TypeScript

The types for the webhook payloads are sourced from @octokit/webhooks-types, which can be used by themselves.

In addition to these types, @octokit/webhooks exports 2 types specific to itself:

Note that changes to the exported types are not considered breaking changes, as the changes will not impact production code, but only fail locally or during CI at build time.

`EmitterWebhookEventName`

A union of all possible events and event/action combinations supported by the event emitter, e.g. "check_run" | "check_run.completed" | ... many more ... | "workflow_run.requested".

`EmitterWebhookEvent`

The object that is emitted by @octokit/webhooks as an event; made up of an id, name, and payload properties. An optional generic parameter can be passed to narrow the type of the name and payload properties based on event names or event/action combinations, e.g. EmitterWebhookEvent<"check_run" | "code_scanning_alert.fixed">.

License

MIT

Usage no npm install needed!