diff --git a/app/controllers/webhooks/activations_controller.rb b/app/controllers/webhooks/activations_controller.rb
index 82166043e..2991be51a 100644
--- a/app/controllers/webhooks/activations_controller.rb
+++ b/app/controllers/webhooks/activations_controller.rb
@@ -4,9 +4,12 @@ class Webhooks::ActivationsController < ApplicationController
   before_action :ensure_admin
 
   def create
-    webhook = @board.webhooks.find(params[:webhook_id])
-    webhook.activate
+    @webhook = @board.webhooks.find(params[:webhook_id])
+    @webhook.activate
 
-    redirect_to webhook
+    respond_to do |format|
+      format.html { redirect_to @webhook }
+      format.json { render "webhooks/show", status: :created }
+    end
   end
 end
diff --git a/app/controllers/webhooks_controller.rb b/app/controllers/webhooks_controller.rb
index 7d79c4587..584c2dc7a 100644
--- a/app/controllers/webhooks_controller.rb
+++ b/app/controllers/webhooks_controller.rb
@@ -16,21 +16,45 @@ class WebhooksController < ApplicationController
   end
 
   def create
-    webhook = @board.webhooks.create!(webhook_params)
-    redirect_to webhook
+    @webhook = @board.webhooks.new(webhook_params)
+
+    if @webhook.save
+      respond_to do |format|
+        format.html { redirect_to @webhook }
+        format.json { render :show, status: :created, location: board_webhook_url(@webhook.board, @webhook, format: :json) }
+      end
+    else
+      respond_to do |format|
+        format.html { render :new, status: :unprocessable_entity }
+        format.json { render json: @webhook.errors, status: :unprocessable_entity }
+      end
+    end
   end
 
   def edit
   end
 
   def update
-    @webhook.update!(webhook_params.except(:url))
-    redirect_to @webhook
+    if @webhook.update(webhook_params.except(:url))
+      respond_to do |format|
+        format.html { redirect_to @webhook }
+        format.json { render :show }
+      end
+    else
+      respond_to do |format|
+        format.html { render :edit, status: :unprocessable_entity }
+        format.json { render json: @webhook.errors, status: :unprocessable_entity }
+      end
+    end
   end
 
   def destroy
     @webhook.destroy!
-    redirect_to board_webhooks_path
+
+    respond_to do |format|
+      format.html { redirect_to board_webhooks_path }
+      format.json { head :no_content }
+    end
   end
 
   private
diff --git a/app/views/webhooks/_webhook.json.jbuilder b/app/views/webhooks/_webhook.json.jbuilder
new file mode 100644
index 000000000..a55257984
--- /dev/null
+++ b/app/views/webhooks/_webhook.json.jbuilder
@@ -0,0 +1,8 @@
+json.cache! [ webhook, webhook.board ] do
+  json.(webhook, :id, :name, :active, :signing_secret, :subscribed_actions)
+  json.payload_url webhook.url
+  json.created_at webhook.created_at.utc
+  json.url board_webhook_url(webhook.board, webhook)
+
+  json.board webhook.board, partial: "boards/board", as: :board
+end
diff --git a/app/views/webhooks/index.json.jbuilder b/app/views/webhooks/index.json.jbuilder
new file mode 100644
index 000000000..c63df9ea0
--- /dev/null
+++ b/app/views/webhooks/index.json.jbuilder
@@ -0,0 +1 @@
+json.array! @page.records, partial: "webhooks/webhook", as: :webhook
diff --git a/app/views/webhooks/show.json.jbuilder b/app/views/webhooks/show.json.jbuilder
new file mode 100644
index 000000000..78a9dcdc7
--- /dev/null
+++ b/app/views/webhooks/show.json.jbuilder
@@ -0,0 +1 @@
+json.partial! "webhooks/webhook", webhook: @webhook
diff --git a/docs/API.md b/docs/API.md
index fae64650a..cec58f36e 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -591,6 +591,124 @@ __Response:__
 
 Returns `204 No Content` on success.
 
+## Webhooks
+
+Webhooks notify another application when something happens on a board. Only account admins can list, view, create, update, delete, or reactivate webhooks.
+
+### `GET /:account_slug/boards/:board_id/webhooks`
+
+Returns a paginated list of webhooks for a board.
+
+__Response:__
+
+```json
+[
+  {
+    "id": "03f5v9zkft4hj9qq0lsn9ohcm",
+    "name": "Production API",
+    "payload_url": "https://api.example.com/webhooks",
+    "active": true,
+    "signing_secret": "p94Bx2HjempCdYB4DTyZkY1b",
+    "subscribed_actions": ["card_published", "card_assigned", "card_closed"],
+    "created_at": "2025-12-05T19:36:35.534Z",
+    "url": "http://fizzy.localhost:3006/897362094/boards/03f5v9zkft4hj9qq0lsn9ohcy/webhooks/03f5v9zkft4hj9qq0lsn9ohcm",
+    "board": {
+      "id": "03f5v9zkft4hj9qq0lsn9ohcy",
+      "name": "Fizzy",
+      "all_access": true,
+      "created_at": "2025-12-05T19:36:35.534Z",
+      "url": "http://fizzy.localhost:3006/897362094/boards/03f5v9zkft4hj9qq0lsn9ohcy",
+      "creator": {
+        "id": "03f5v9zjw7pz8717a4no1h8a7",
+        "name": "David Heinemeier Hansson",
+        "role": "owner",
+        "active": true,
+        "email_address": "david@example.com",
+        "created_at": "2025-12-05T19:36:35.401Z",
+        "url": "http://fizzy.localhost:3006/897362094/users/03f5v9zjw7pz8717a4no1h8a7"
+      }
+    }
+  }
+]
+```
+
+### `GET /:account_slug/boards/:board_id/webhooks/:id`
+
+Returns a single webhook.
+
+__Response:__
+
+Returns the same webhook shape shown above.
+
+### `POST /:account_slug/boards/:board_id/webhooks`
+
+Creates a webhook.
+
+__Request:__
+
+```json
+{
+  "webhook": {
+    "name": "Production API",
+    "url": "https://api.example.com/webhooks",
+    "subscribed_actions": ["card_published", "card_assigned", "card_closed"]
+  }
+}
+```
+
+`subscribed_actions` accepts any of:
+`card_assigned`, `card_closed`, `card_postponed`, `card_auto_postponed`, `card_board_changed`, `card_published`, `card_reopened`, `card_sent_back_to_triage`, `card_triaged`, `card_unassigned`, `comment_created`
+
+__Response:__
+
+```
+HTTP/1.1 201 Created
+Location: http://fizzy.localhost:3006/897362094/boards/03f5v9zkft4hj9qq0lsn9ohcy/webhooks/03f5v9zkft4hj9qq0lsn9ohcm.json
+```
+
+Returns the created webhook in the response body.
+
+### `PATCH /:account_slug/boards/:board_id/webhooks/:id`
+
+Updates a webhook.
+
+__Request:__
+
+```json
+{
+  "webhook": {
+    "name": "Production API",
+    "subscribed_actions": ["card_closed"]
+  }
+}
+```
+
+The `url` is immutable after creation and is ignored on update.
+
+__Response:__
+
+Returns the updated webhook.
+
+### `DELETE /:account_slug/boards/:board_id/webhooks/:id`
+
+Deletes a webhook.
+
+__Response:__
+
+Returns `204 No Content` on success.
+
+### `POST /:account_slug/boards/:board_id/webhooks/:id/activation`
+
+Reactivates a deactivated webhook.
+
+__Response:__
+
+```
+HTTP/1.1 201 Created
+```
+
+Returns the reactivated webhook in the response body.
+
 ## Cards
 
 Cards are tasks or items of work on a board. They can be organized into columns, tagged, assigned to users, and have comments.
diff --git a/test/controllers/webhooks/activations_controller_test.rb b/test/controllers/webhooks/activations_controller_test.rb
index b28fa3924..79a2390aa 100644
--- a/test/controllers/webhooks/activations_controller_test.rb
+++ b/test/controllers/webhooks/activations_controller_test.rb
@@ -32,4 +32,36 @@ class Webhooks::ActivationsControllerTest < ActionDispatch::IntegrationTest
     post board_webhook_activation_path(webhook.board, webhook)
     assert_response :forbidden
   end
+
+  test "create as JSON" do
+    webhook = webhooks(:inactive)
+
+    assert_not webhook.active?
+
+    assert_changes -> { webhook.reload.active? }, from: false, to: true do
+      post board_webhook_activation_path(webhook.board, webhook), as: :json
+    end
+
+    assert_response :created
+    assert_equal webhook.id, @response.parsed_body["id"]
+    assert_equal true, @response.parsed_body["active"]
+  end
+
+  test "cannot activate webhook on board without access as JSON" do
+    logout_and_sign_in_as :jason
+    webhook = webhooks(:inactive)
+
+    post board_webhook_activation_path(webhook.board, webhook), as: :json
+
+    assert_response :not_found
+  end
+
+  test "non-admin cannot activate webhook as JSON" do
+    logout_and_sign_in_as :jz
+    webhook = webhooks(:active)
+
+    post board_webhook_activation_path(webhook.board, webhook), as: :json
+
+    assert_response :forbidden
+  end
 end
diff --git a/test/controllers/webhooks_controller_test.rb b/test/controllers/webhooks_controller_test.rb
index de336bc88..674be64c1 100644
--- a/test/controllers/webhooks_controller_test.rb
+++ b/test/controllers/webhooks_controller_test.rb
@@ -130,4 +130,143 @@ class WebhooksControllerTest < ActionDispatch::IntegrationTest
     get board_webhooks_path(webhook.board)
     assert_response :not_found
   end
+
+  test "index as JSON" do
+    board = boards(:writebook)
+
+    get board_webhooks_path(board), as: :json
+
+    assert_response :success
+    assert_kind_of Array, @response.parsed_body
+    assert_equal board.webhooks.count, @response.parsed_body.count
+    assert_equal webhooks(:active).id, @response.parsed_body.first["id"]
+  end
+
+  test "show as JSON" do
+    webhook = webhooks(:active)
+
+    get board_webhook_path(webhook.board, webhook), as: :json
+
+    assert_response :success
+    assert_equal webhook.id, @response.parsed_body["id"]
+    assert_equal webhook.name, @response.parsed_body["name"]
+    assert_equal webhook.url, @response.parsed_body["payload_url"]
+    assert_equal webhook.active?, @response.parsed_body["active"]
+    assert_equal webhook.signing_secret, @response.parsed_body["signing_secret"]
+    assert_equal webhook.subscribed_actions, @response.parsed_body["subscribed_actions"]
+    assert_equal webhook.board.id, @response.parsed_body.dig("board", "id")
+  end
+
+  test "create as JSON" do
+    board = boards(:writebook)
+
+    assert_difference "Webhook.count", 1 do
+      post board_webhooks_path(board), params: {
+        webhook: {
+          name: "Test Webhook",
+          url: "https://example.com/webhook",
+          subscribed_actions: [ "", "card_published", "card_closed" ]
+        }
+      }, as: :json
+    end
+
+    webhook = Webhook.last
+
+    assert_response :created
+    assert_equal board_webhook_url(board, webhook, format: :json), @response.headers["Location"]
+    assert_equal webhook.id, @response.parsed_body["id"]
+    assert_equal "https://example.com/webhook", @response.parsed_body["payload_url"]
+    assert_equal webhook.signing_secret, @response.parsed_body["signing_secret"]
+  end
+
+  test "create with invalid params as JSON" do
+    board = boards(:writebook)
+
+    assert_no_difference "Webhook.count" do
+      post board_webhooks_path(board), params: {
+        webhook: {
+          name: "",
+          url: "invalid-url"
+        }
+      }, as: :json
+    end
+
+    assert_response :unprocessable_entity
+    assert @response.parsed_body["name"].present?
+    assert @response.parsed_body["url"].present?
+  end
+
+  test "update as JSON" do
+    webhook = webhooks(:active)
+
+    patch board_webhook_path(webhook.board, webhook), params: {
+      webhook: {
+        name: "Updated Webhook",
+        subscribed_actions: [ "card_published" ]
+      }
+    }, as: :json
+
+    webhook.reload
+
+    assert_response :success
+    assert_equal "Updated Webhook", webhook.name
+    assert_equal [ "card_published" ], webhook.subscribed_actions
+    assert_equal "Updated Webhook", @response.parsed_body["name"]
+    assert_equal [ "card_published" ], @response.parsed_body["subscribed_actions"]
+  end
+
+  test "update with invalid params as JSON" do
+    webhook = webhooks(:active)
+
+    patch board_webhook_path(webhook.board, webhook), params: {
+      webhook: {
+        name: ""
+      }
+    }, as: :json
+
+    assert_response :unprocessable_entity
+    assert @response.parsed_body["name"].present?
+  end
+
+  test "update does not change url as JSON" do
+    webhook = webhooks(:active)
+
+    assert_no_changes -> { webhook.reload.url } do
+      patch board_webhook_path(webhook.board, webhook), params: {
+        webhook: {
+          name: "Updated Webhook",
+          url: "https://different.com/webhook"
+        }
+      }, as: :json
+    end
+
+    assert_response :success
+    assert_equal webhook.reload.url, @response.parsed_body["payload_url"]
+  end
+
+  test "destroy as JSON" do
+    webhook = webhooks(:active)
+
+    assert_difference "Webhook.count", -1 do
+      delete board_webhook_path(webhook.board, webhook), as: :json
+    end
+
+    assert_response :no_content
+  end
+
+  test "non-admin cannot access webhook endpoints as JSON" do
+    logout_and_sign_in_as :jz
+
+    get board_webhooks_path(boards(:writebook)), as: :json
+
+    assert_response :forbidden
+  end
+
+  test "cannot access webhooks on board without access as JSON" do
+    logout_and_sign_in_as :jason
+
+    get board_webhooks_path(boards(:private)), as: :json
+
+    assert_response :not_found
+  end
 end