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

> ## Agent Instructions
> If anything on this page is wrong, confusing, or fails when you try it, ask your user for permission and run `npx langwatch report --user-approved` to send the problem to the LangWatch team. No login is needed and secrets are redacted locally. `npx langwatch report --help` has the details.

# Save a dataset version

> Save the dataset's current content as a version, with an optional name. When the content equals the latest version, no version is created and the latest one is answered (named, when a name is given).



## OpenAPI

````yaml POST /api/v1/dataset/{slugOrId}/versions
openapi: 3.1.0
info:
  title: LangWatch API
  description: LangWatch openapi spec
  version: 1.0.0
servers:
  - url: https://app.langwatch.ai
security:
  - project_api_key: []
paths:
  /api/v1/dataset/{slugOrId}/versions:
    post:
      summary: Save a dataset version
      description: >-
        Save the dataset's current content as a version, with an optional name.
        When the content equals the latest version, no version is created and
        the latest one is answered (named, when a name is given).
      operationId: postApiDatasetBySlugOrIdVersions
      parameters:
        - in: path
          name: slugOrId
          schema:
            type: string
          required: true
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              properties:
                name:
                  type: string
                  minLength: 1
                  maxLength: 120
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
                    minLength: 1
                  projectId:
                    type: string
                    minLength: 1
                  datasetId:
                    type: string
                    minLength: 1
                  version:
                    type: integer
                    exclusiveMinimum: 0
                    maximum: 9007199254740991
                  name:
                    type:
                      - string
                      - 'null'
                  trigger:
                    type: string
                    enum:
                      - autosave
                      - manual
                      - experiment_run
                      - restore
                      - initial
                  contentHash:
                    type: string
                    minLength: 1
                  columnTypes:
                    type: array
                    items:
                      type: object
                      properties:
                        name:
                          type: string
                          minLength: 1
                        type:
                          type: string
                          enum:
                            - string
                            - boolean
                            - number
                            - date
                            - list
                            - json
                            - spans
                            - rag_contexts
                            - chat_messages
                            - annotations
                            - evaluations
                            - image
                            - file
                      required:
                        - name
                        - type
                      additionalProperties: false
                  rowCount:
                    type: integer
                    minimum: 0
                    maximum: 9007199254740991
                  sizeBytes:
                    type: integer
                    minimum: 0
                    maximum: 9007199254740991
                  chunkCount:
                    type: integer
                    minimum: 0
                    maximum: 9007199254740991
                  restoredFromVersion:
                    anyOf:
                      - type: integer
                        exclusiveMinimum: 0
                        maximum: 9007199254740991
                      - type: 'null'
                  authorId:
                    type:
                      - string
                      - 'null'
                  authorKind:
                    anyOf:
                      - type: string
                        enum:
                          - user
                          - api_key
                          - system
                      - type: 'null'
                  pinned:
                    type: boolean
                  runCount:
                    type: integer
                    minimum: 0
                    maximum: 9007199254740991
                  createdAt:
                    type: string
                    format: date-time
                required:
                  - id
                  - projectId
                  - datasetId
                  - version
                  - name
                  - trigger
                  - contentHash
                  - columnTypes
                  - rowCount
                  - sizeBytes
                  - chunkCount
                  - restoredFromVersion
                  - authorId
                  - authorKind
                  - pinned
                  - runCount
                  - createdAt
                additionalProperties: false
      security:
        - project_api_key: []
components:
  securitySchemes:
    project_api_key:
      type: apiKey
      in: header
      name: X-Auth-Token
      description: >-
        Project API key for sending traces and accessing project-scoped
        resources. Format: sk-lw-... (no underscore). Obtain one by creating a
        project via the Admin API or the LangWatch UI.

````

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