diff --git a/packages/javascript-api/src/lib/model/line/line-appointment-settings.ts b/packages/javascript-api/src/lib/model/line/line-appointment-settings.ts
new file mode 100644
index 00000000..48485e6a
--- /dev/null
+++ b/packages/javascript-api/src/lib/model/line/line-appointment-settings.ts
@@ -0,0 +1,4 @@
+export interface LineAppointmentSettings {
+  enabled: boolean;
+  duration: 15 | 30 | 45 | 60 | 90 | 120 | 180;
+}
diff --git a/packages/javascript-api/src/lib/model/line/line-color.ts b/packages/javascript-api/src/lib/model/line/line-color.ts
new file mode 100644
index 00000000..c8584cb2
--- /dev/null
+++ b/packages/javascript-api/src/lib/model/line/line-color.ts
@@ -0,0 +1,11 @@
+export type LineColor =
+  | 'VIOLET'
+  | 'TEAL'
+  | 'MINT'
+  | 'CORAL'
+  | 'YELLOW'
+  | 'ROSE'
+  | 'INDIGO'
+  | 'BLUE'
+  | 'LAVENDER'
+  | 'MARSHMALLOW';
diff --git a/packages/javascript-api/src/lib/model/line/line-created-response.ts b/packages/javascript-api/src/lib/model/line/line-created-response.ts
new file mode 100644
index 00000000..0a40fa90
--- /dev/null
+++ b/packages/javascript-api/src/lib/model/line/line-created-response.ts
@@ -0,0 +1,3 @@
+export interface LineCreatedResponse {
+  id: string;
+}
diff --git a/packages/javascript-api/src/lib/model/line/line-creation-request.ts b/packages/javascript-api/src/lib/model/line/line-creation-request.ts
new file mode 100644
index 00000000..b4dcd4b9
--- /dev/null
+++ b/packages/javascript-api/src/lib/model/line/line-creation-request.ts
@@ -0,0 +1,11 @@
+import { LineAppointmentSettings } from './line-appointment-settings.js';
+import { LineColor } from './line-color.js';
+import { LineTranslation } from './line-translation.js';
+
+export interface LineCreationRequest {
+  name: string;
+  color: LineColor;
+  disabled?: boolean;
+  translations?: LineTranslation[];
+  appointmentSettings?: LineAppointmentSettings;
+}
diff --git a/packages/javascript-api/src/lib/model/line/line-translation.ts b/packages/javascript-api/src/lib/model/line/line-translation.ts
new file mode 100644
index 00000000..05f3bd61
--- /dev/null
+++ b/packages/javascript-api/src/lib/model/line/line-translation.ts
@@ -0,0 +1,4 @@
+export interface LineTranslation {
+  languageCode: string;
+  name?: string;
+}
diff --git a/packages/javascript-api/src/lib/services/line/line.service.spec.ts b/packages/javascript-api/src/lib/services/line/line.service.spec.ts
index 39de9e4e..a817167f 100644
--- a/packages/javascript-api/src/lib/services/line/line.service.spec.ts
+++ b/packages/javascript-api/src/lib/services/line/line.service.spec.ts
@@ -1,5 +1,7 @@
 import * as sinon from 'sinon';
 import { Line } from '../../model/line';
+import { LineCreationRequest } from '../../model/line/line-creation-request';
+import { ResponseValidationError } from '../../model/errors/response-validation-error';
 import { Qminder } from '../../qminder';
 import { LineService } from './line.service';
 
@@ -72,6 +74,59 @@ describe('Line service', function () {
     });
   });
 
+  describe('create()', function () {
+    const SUCCESSFUL_RESPONSE = { id: '12345' };
+
+    it('sends the request to the correct URL with JSON body and version headers', async function () {
+      requestStub.resolves(SUCCESSFUL_RESPONSE);
+      const request: LineCreationRequest = {
+        name: 'Priority Service',
+        color: 'TEAL',
+      };
+      const result = await LineService.create(LOCATION_ID, request);
+      expect(requestStub.firstCall.args).toEqual([
+        `locations/${LOCATION_ID}/lines`,
+        {
+          method: 'POST',
+          body: JSON.stringify(request),
+          headers: { 'X-Qminder-API-Version': '2020-09-01' },
+        },
+      ]);
+      expect(result).toEqual(SUCCESSFUL_RESPONSE);
+    });
+
+    it('sends optional fields when provided', async function () {
+      requestStub.resolves(SUCCESSFUL_RESPONSE);
+      const request: LineCreationRequest = {
+        name: 'Priority Service',
+        color: 'VIOLET',
+        disabled: true,
+        translations: [{ languageCode: 'fr', name: 'Service Prioritaire' }],
+        appointmentSettings: { enabled: true, duration: 30 },
+      };
+      await LineService.create(LOCATION_ID, request);
+      expect(requestStub.firstCall.args).toEqual([
+        `locations/${LOCATION_ID}/lines`,
+        {
+          method: 'POST',
+          body: JSON.stringify(request),
+          headers: { 'X-Qminder-API-Version': '2020-09-01' },
+        },
+      ]);
+    });
+
+    it('throws when response does not contain id', async function () {
+      requestStub.resolves({});
+      const request: LineCreationRequest = {
+        name: 'Priority Service',
+        color: 'TEAL',
+      };
+      await expect(LineService.create(LOCATION_ID, request)).rejects.toThrow(
+        new ResponseValidationError('Response does not contain "id"'),
+      );
+    });
+  });
+
   describe('update()', function () {
     beforeEach(function (done) {
       requestStub.withArgs('v1/lines/71490').resolves({});
diff --git a/packages/javascript-api/src/lib/services/line/line.service.ts b/packages/javascript-api/src/lib/services/line/line.service.ts
index 75178bc9..b6ca6f05 100644
--- a/packages/javascript-api/src/lib/services/line/line.service.ts
+++ b/packages/javascript-api/src/lib/services/line/line.service.ts
@@ -58,20 +58,24 @@ export const LineService = {
   details,
 
   /**
-   * Create a new Line and return its details.
+   * Create a new Line and return its ID.
    *
    * Calls the following HTTP API: `POST /locations/<ID>/lines`
    *
    * For example:
    *
    * ```javascript
-   * const line: Line = await Qminder.Line.create(950, { name: 'Priority Service' });
-   * console.log(line.id); // 1425
+   * const response = await Qminder.Line.create(950, {
+   *   name: 'Priority Service',
+   *   color: 'TEAL',
+   *   translations: [{ languageCode: 'fr', name: 'Service Prioritaire' }],
+   *   appointmentSettings: { enabled: true, duration: 30 },
+   * });
+   * console.log(response.id); // "1425"
    * ```
    * @param location the location to add the line under
-   * @param line the parameters of the new line - must include the line name
-   * @returns a Promise that resolves to a new Line object, created according
-   * to the parameters.
+   * @param line the parameters of the new line - must include name and color
+   * @returns a Promise that resolves to a LineCreatedResponse containing the new line's ID.
    */
   create,
 
diff --git a/packages/javascript-api/src/lib/services/line/line.ts b/packages/javascript-api/src/lib/services/line/line.ts
index b167fdfb..27944c35 100644
--- a/packages/javascript-api/src/lib/services/line/line.ts
+++ b/packages/javascript-api/src/lib/services/line/line.ts
@@ -1,9 +1,12 @@
 import { Line } from '../../model/line.js';
+import { LineCreatedResponse } from '../../model/line/line-created-response.js';
+import { LineCreationRequest } from '../../model/line/line-creation-request.js';
 import { Location } from '../../model/location.js';
 import { extractId, IdOrObject } from '../../util/id-or-object.js';
 import { ApiBase, SuccessResponse } from '../api-base/api-base.js';
+import { V2_HEADERS } from '../v2-headers.js';
+import { ResponseValidationError } from '../../model/errors/response-validation-error.js';
 
-type LineCreateParameters = Partial<Omit<Line, 'id'>> & Pick<Line, 'name'>;
 type LineUpdateParameters = Pick<Line, 'id'> &
   Partial<Pick<Line, 'color' | 'name'>>;
 
@@ -25,10 +28,10 @@ export function details(line: IdOrObject<Line>): Promise<Line> {
   return ApiBase.request(`v1/lines/${lineId}/`);
 }
 
-export function create(
+export async function create(
   location: IdOrObject<Location>,
-  line: LineCreateParameters,
-): Promise<Line> {
+  line: LineCreationRequest,
+): Promise<LineCreatedResponse> {
   const locationId = extractId(location);
   if (!locationId || typeof locationId !== 'string') {
     throw new Error('Location ID invalid or missing.');
@@ -39,10 +42,24 @@ export function create(
   if (!line.name || typeof line.name !== 'string') {
     throw new Error('Cannot create a line without a line name.');
   }
-  return ApiBase.request(`v1/locations/${locationId}/lines`, {
-    body: line,
-    method: 'POST',
-  }) as Promise<Line>;
+  if (!line.color || typeof line.color !== 'string') {
+    throw new Error('Cannot create a line without a color.');
+  }
+
+  const result: LineCreatedResponse = await ApiBase.request(
+    `locations/${locationId}/lines`,
+    {
+      method: 'POST',
+      body: JSON.stringify(line),
+      headers: V2_HEADERS,
+    },
+  );
+
+  if (!result.id) {
+    throw new ResponseValidationError('Response does not contain "id"');
+  }
+
+  return result;
 }
 
 export function update(line: LineUpdateParameters): Promise<SuccessResponse> {
diff --git a/packages/javascript-api/src/public-api/model.ts b/packages/javascript-api/src/public-api/model.ts
index dca6a840..45a378a3 100644
--- a/packages/javascript-api/src/public-api/model.ts
+++ b/packages/javascript-api/src/public-api/model.ts
@@ -5,6 +5,11 @@ export { Desk } from '../lib/model/desk.js';
 export { Device } from '../lib/model/device.js';
 export { Id } from '../lib/model/id.js';
 export { Line } from '../lib/model/line.js';
+export { LineColor } from '../lib/model/line/line-color.js';
+export { LineTranslation } from '../lib/model/line/line-translation.js';
+export { LineAppointmentSettings } from '../lib/model/line/line-appointment-settings.js';
+export { LineCreationRequest } from '../lib/model/line/line-creation-request.js';
+export { LineCreatedResponse } from '../lib/model/line/line-created-response.js';
 export { Location } from '../lib/model/location.js';
 export { TicketExtra } from '../lib/model/ticket/ticket-extra.js';
 export { TicketLabel } from '../lib/model/ticket/ticket-label.js';