> ## Documentation Index
> Fetch the complete documentation index at: https://learn.nexudus.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Get one CourseLesson

> Retrieve a single CourseLesson record by its Id.

A **CourseLesson** is an individual learning unit within a Course. Lessons are the building blocks that customers complete to work through a course's content. Each lesson belongs to a `Course` and optionally to a `CourseSection` that groups related lessons together.

Lessons have two key behavioural settings:

**`UnlockType`** — controls when a lesson becomes available to enrolled members:

| Value      | Meaning                                                        |
| ---------- | -------------------------------------------------------------- |
| Immediate  | Available as soon as the member enrols                         |
| Sequential | Unlocked only after the previous lesson is completed           |
| Timed      | Unlocked after a number of days specified by `UnlockAfterDays` |

**`CompletionType`** — defines what action marks the lesson as done:

| Value   | Meaning                                                                    |
| ------- | -------------------------------------------------------------------------- |
| None    | No completion tracking                                                     |
| Visited | Marked complete when the member opens the lesson                           |
| Button  | Member must click a completion button                                      |
| Video   | Member must finish watching the embedded video (must be hosted on YouTube) |

## Authentication

<Note>
  This endpoint requires OAuth2 authentication. Include a valid bearer token in the `Authorization` header.
  The authenticated user must be a full unrestricted administrator or have the **`CourseLesson-Read`** role.
</Note>

## Path Parameters

<ParamField path="id" type="integer" required>
  The Id of the CourseLesson record to retrieve.
</ParamField>

## Code Examples

<CodeGroup>
  ```bash cURL theme={null}
  curl -X GET \
    "https://spaces.nexudus.com/api/content/courselessons/87654321" \
    -H "Authorization: Bearer YOUR_TOKEN"
  ```

  ```javascript JavaScript theme={null}
  const response = await fetch(
    'https://spaces.nexudus.com/api/content/courselessons/87654321',
    {
      headers: {
        'Authorization': 'Bearer YOUR_TOKEN'
      }
    }
  );

  const record = await response.json();
  ```

  ```python Python theme={null}
  import requests

  response = requests.get(
      'https://spaces.nexudus.com/api/content/courselessons/87654321',
      headers={
          'Authorization': 'Bearer YOUR_TOKEN'
      }
  )

  record = response.json()
  ```
</CodeGroup>

## Response

### 200

<ResponseField name="CourseId" type="integer">
  ID of the course this lesson belongs to.
</ResponseField>

<ResponseField name="CourseTitle" type="string">
  Title of the parent course.
</ResponseField>

<ResponseField name="SectionId" type="integer">
  ID of the course section this lesson belongs to (optional; lessons without a section appear ungrouped).
</ResponseField>

<ResponseField name="SectionDisplayOrder" type="integer">
  Display order of the parent section.
</ResponseField>

<ResponseField name="SectionTitle" type="string">
  Title of the parent section.
</ResponseField>

<ResponseField name="InstructorId" type="integer">
  ID of the coworker attributed as instructor for this lesson (optional; overrides the course-level host for this lesson).
</ResponseField>

<ResponseField name="InstructorFullName" type="string">
  Instructor full name.
</ResponseField>

<ResponseField name="InstructorCompanyName" type="string">
  Instructor company name.
</ResponseField>

<ResponseField name="InstructorTeamNames" type="string">
  Comma-separated list of teams the instructor belongs to.
</ResponseField>

<ResponseField name="Title" type="string">
  Lesson title displayed to members.
</ResponseField>

<ResponseField name="SummaryText" type="string">
  Short summary shown in the lesson listing.
</ResponseField>

<ResponseField name="LessonContents" type="string">
  Full HTML or rich-text body of the lesson displayed to members when they open it.
</ResponseField>

<ResponseField name="Active" type="boolean">
  Whether the lesson is active and visible to enrolled members.
</ResponseField>

<ResponseField name="DisplayOrder" type="integer">
  Position of the lesson within its section (or the course if unsectioned); lower numbers appear first.
</ResponseField>

<ResponseField name="UnlockType" type="integer">
  When the lesson becomes available: Immediate (1), after the previous lesson is done — Sequential (2), or after a set number of days — Timed (3). See `eLessonUnlockType` enum values: `1` = Immediate, `2` = Sequential, `3` = Timed.
</ResponseField>

<ResponseField name="ImageFileName" type="string">
  Stored filename of the lesson thumbnail image (read-only; use `NewImageUrl` to set).
</ResponseField>

<ResponseField name="NewImageUrl" type="string">
  URL of a new thumbnail image to upload (JPG/JPEG, PNG, or GIF, max 10 MB).
</ResponseField>

<ResponseField name="ClearImageFile" type="boolean">
  Set to true to remove the existing thumbnail image.
</ResponseField>

<ResponseField name="UnlockAfterDays" type="integer">
  Number of days after enrolment before the lesson unlocks; only used when UnlockType is Timed (3).
</ResponseField>

<ResponseField name="CompletionType" type="integer">
  How completion is tracked: None (1), Visited (2), completion Button (3), or Video watched (4). Video completion requires the lesson to embed a YouTube-hosted video.. See `eLessonCompletionType` enum values: `1` = None, `2` = Visited, `3` = Button, `4` = Video.
</ResponseField>

<ResponseField name="Id" type="integer">
  Unique record identifier.
</ResponseField>

<ResponseField name="UniqueId" type="string">
  UUID of the record.
</ResponseField>

<ResponseField name="CreatedOn" type="string">
  Date and time the record was created (ISO 8601).
</ResponseField>

<ResponseField name="UpdatedOn" type="string">
  Date and time the record was last updated (ISO 8601).
</ResponseField>

<ResponseField name="UpdatedBy" type="string">
  Email of the user who last updated this record.
</ResponseField>

<ResponseField name="IsNew" type="boolean">
  Whether the record was recently created.
</ResponseField>

<ResponseField name="SystemId" type="string">
  External system identifier.
</ResponseField>

```json Example Response theme={null}
{
  "CourseId": 0,
  "CourseTitle": null,
  "SectionId": null,
  "SectionDisplayOrder": null,
  "SectionTitle": null,
  "InstructorId": null,
  "InstructorFullName": null,
  "InstructorCompanyName": null,
  "InstructorTeamNames": null,
  "Title": "",
  "SummaryText": null,
  "LessonContents": null,
  "Active": false,
  "DisplayOrder": 0,
  "UnlockType": 0,
  "ImageFileName": null,
  "NewImageUrl": null,
  "ClearImageFile": null,
  "UnlockAfterDays": 0,
  "CompletionType": 0,
  "Id": 87654321,
  "UpdatedOn": "2025-01-15T10:30:00Z",
  "CreatedOn": "2025-01-10T08:00:00Z",
  "UniqueId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "UpdatedBy": "admin@example.com",
  "IsNew": false,
  "SystemId": null,
  "ToStringText": "CourseLesson Example",
  "LocalizationDetails": null,
  "CustomFields": null
}
```