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

# List Templates

> Retrieve a paginated list of email templates for a project. If `project_id` is not provided, templates from the team's default project will be returned.

Returns a paginated list of templates for your team. Optionally filter by project using the `project_id` query parameter.

Each template in the list includes its name, slug, project and folder assignment, and timestamps. To retrieve the full HTML content and version details for a specific template, use [Get Template](/api-reference/templates/get-template).


## OpenAPI

````yaml GET /templates
openapi: 3.1.0
info:
  title: Lettr API
  version: 1.0.0
  description: >-
    Lettr Email API - Send transactional emails with tracking, attachments, and
    personalization.
  contact:
    name: Lettr Support
    url: https://lettr.com
  license:
    name: Proprietary
    url: https://lettr.com/terms
servers:
  - url: https://app.lettr.com/api
    description: Production
security: []
tags:
  - name: Emails
    description: Email sending operations
  - name: Templates
    description: Email template management operations
  - name: Domains
    description: Domain management operations
  - name: Webhooks
    description: Webhook management operations
  - name: Audience
    description: 'Audience management: lists, contacts, topics, properties, and segments'
  - name: Campaigns
    description: >-
      Campaign operations: listing, stats, engagement events, and
      dispatch/scheduling
paths:
  /templates:
    get:
      tags:
        - Templates
      summary: List Templates
      description: >-
        Retrieve a paginated list of email templates for a project. If
        `project_id` is not provided, templates from the team's default project
        will be returned.
      operationId: listTemplates
      parameters:
        - name: project_id
          in: query
          description: >-
            Project ID to retrieve templates from. If not provided, uses the
            team's default project.
          schema:
            type: integer
            minimum: 1
        - name: per_page
          in: query
          description: Number of results per page (1-100)
          schema:
            type: integer
            minimum: 1
            maximum: 100
            default: 25
        - name: page
          in: query
          description: Page number
          schema:
            type: integer
            minimum: 1
            default: 1
      responses:
        '200':
          description: List of templates retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListTemplatesResponse'
              example:
                message: Templates retrieved successfully.
                data:
                  templates:
                    - id: 1
                      name: Welcome Email
                      slug: welcome-email
                      project_id: 5
                      folder_id: 10
                      created_at: '2025-01-15T10:00:00+00:00'
                      updated_at: '2025-01-20T14:30:00+00:00'
                  pagination:
                    total: 42
                    per_page: 25
                    current_page: 1
                    last_page: 2
        '401':
          $ref: '#/components/responses/UnauthorizedError'
        '404':
          description: Project not found or no default project configured
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              examples:
                project_not_found:
                  summary: Project not found
                  value:
                    message: >-
                      Project with ID '123' was not found or you don't have
                      access to it.
                    error_code: not_found
                no_default_project:
                  summary: No default project configured
                  value:
                    message: No default project is configured for this team.
                    error_code: not_found
        '422':
          description: Validation error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ValidationErrorResponse'
              example:
                message: Validation failed.
                error_code: validation_error
                errors:
                  project_id:
                    - The project_id parameter must be an integer.
        '500':
          description: Server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
              example:
                message: Failed to retrieve templates. Please try again later.
                error_code: send_error
      security:
        - bearerAuth: []
components:
  schemas:
    ListTemplatesResponse:
      type: object
      description: Response containing a paginated list of templates
      required:
        - message
        - data
      properties:
        message:
          type: string
          description: Human-readable response message
          example: Templates retrieved successfully.
        data:
          type: object
          required:
            - templates
            - pagination
          properties:
            templates:
              type: array
              description: List of templates
              items:
                $ref: '#/components/schemas/TemplateView'
            pagination:
              $ref: '#/components/schemas/TemplatesPagination'
    ErrorResponse:
      type: object
      required:
        - message
        - error_code
      description: Error response for non-validation errors (400, 409, 500, 502).
      properties:
        message:
          type: string
          description: Human-readable error message
          example: The sender domain could not be determined from the email address.
        error_code:
          $ref: '#/components/schemas/ErrorCode'
    ValidationErrorResponse:
      type: object
      required:
        - message
        - error_code
        - errors
      properties:
        message:
          type: string
          description: Human-readable error message
          example: Validation failed.
        error_code:
          type: string
          description: Error code (always `validation_error` for 422 responses)
          const: validation_error
          example: validation_error
        errors:
          type: object
          description: Field-specific validation errors
          additionalProperties:
            type: array
            items:
              type: string
          example:
            from:
              - The sender email address is required.
            to:
              - At least one recipient email address is required.
    TemplateView:
      type: object
      description: View of an email template
      required:
        - id
        - name
        - slug
        - project_id
        - folder_id
        - created_at
        - updated_at
      properties:
        id:
          type: integer
          description: Unique identifier for the template
          example: 1
        name:
          type: string
          description: Name of the template
          example: Welcome Email
        slug:
          type: string
          description: URL-friendly identifier for the template
          example: welcome-email
        project_id:
          type: integer
          description: ID of the project containing this template
          example: 5
        folder_id:
          type: integer
          description: ID of the folder containing this template
          example: 10
        created_at:
          type: string
          format: date-time
          description: When the template was created
          example: '2025-01-15T10:00:00+00:00'
        updated_at:
          type: string
          format: date-time
          description: When the template was last updated
          example: '2025-01-20T14:30:00+00:00'
    TemplatesPagination:
      type: object
      description: Pagination information for templates list
      required:
        - total
        - per_page
        - current_page
        - last_page
      properties:
        total:
          type: integer
          minimum: 0
          description: Total number of templates
          example: 42
        per_page:
          type: integer
          minimum: 1
          description: Number of templates per page
          example: 25
        current_page:
          type: integer
          minimum: 1
          description: Current page number
          example: 1
        last_page:
          type: integer
          minimum: 1
          description: Last page number
          example: 2
    UnauthorizedResponse:
      type: object
      required:
        - message
      description: Error response for authentication failures (401).
      properties:
        message:
          type: string
          description: Human-readable error message
          example: API key is required.
    ErrorCode:
      type: string
      description: >-
        Error codes returned by the API.


        | Code | HTTP Status | Description |

        |------|-------------|-------------|

        | `validation_error` | 422 | Request validation failed. Check the
        `errors` object for field-specific messages. |

        | `invalid_domain` | 400 | The sender domain could not be determined
        from the email address. |

        | `unconfigured_domain` | 400 | The sender domain is not configured or
        approved for sending. |

        | `send_error` | 400, 500 | General error during email send preparation
        or domain registration. |

        | `retrieval_error` | 400, 500 | Failed to retrieve resources (e.g.,
        sandbox key without associated user, upstream error). |

        | `transmission_failed` | 502 | Email transmission to the upstream
        provider failed. |

        | `resource_already_exists` | 409 | The resource (e.g., domain) already
        exists. |

        | `not_found` | 404 | The specified resource was not found. |

        | `template_not_found` | 404 | The specified template, project, or
        template version was not found. |

        | `insufficient_scope` | 403 | The API key does not have the required
        scope for this endpoint. |

        | `schedule_cancellation_failed` | 409, 500 | Could not cancel the
        scheduled transmission (already sent or upstream error). |

        | `quota_exceeded` | 429 | Monthly sending quota exceeded. Upgrade your
        plan to continue sending. |

        | `daily_quota_exceeded` | 429 | Daily sending quota exceeded. Try again
        tomorrow. |

        | `campaign_not_sendable` | 422 | The campaign cannot be sent in its
        current state (not a draft, or missing subject/sender/content). |

        | `campaign_not_scheduled` | 422 | The campaign is not scheduled, so it
        cannot be unscheduled. |
      enum:
        - validation_error
        - invalid_domain
        - unconfigured_domain
        - send_error
        - retrieval_error
        - transmission_failed
        - resource_already_exists
        - not_found
        - template_not_found
        - insufficient_scope
        - schedule_cancellation_failed
        - quota_exceeded
        - daily_quota_exceeded
        - campaign_not_sendable
        - campaign_not_scheduled
      example: invalid_domain
  responses:
    UnauthorizedError:
      description: Unauthorized - Missing or invalid API key
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/UnauthorizedResponse'
          examples:
            missing_key:
              summary: Missing API key
              value:
                message: API key is required.
            invalid_key:
              summary: Invalid API key
              value:
                message: Invalid API key.
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: API key for authentication

````