> ## 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.

# Discover what the trace filter fields hold

> Discover what the trace filter fields hold in this project. Without `field`, every facet with its top values. With `field`, that field's values, paged.



## OpenAPI

````yaml GET /api/v1/traces/facets
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/traces/facets:
    get:
      tags:
        - Traces
      summary: Discover what the trace filter fields hold
      description: >-
        Discover what the trace filter fields hold in this project. Without
        `field`, every facet with its top values. With `field`, that field's
        values, paged.
      operationId: getApiTracesFacets
      parameters:
        - in: query
          name: field
          schema:
            type: string
            minLength: 1
            maxLength: 512
        - in: query
          name: prefix
          schema:
            type: string
            maxLength: 512
        - in: query
          name: limit
          schema:
            default: 50
            type: integer
            minimum: 1
            maximum: 1000
        - in: query
          name: offset
          schema:
            default: 0
            type: integer
            minimum: 0
            maximum: 9007199254740991
        - in: query
          name: startDate
          schema:
            type: string
        - in: query
          name: endDate
          schema:
            type: string
      responses:
        '200':
          description: >-
            Without `field`, every facet the project has with its top values and
            whether the payload is still being computed. With `field`, that
            field's values and counts plus the distinct total and whether more
            remain.
          content:
            application/json:
              schema:
                anyOf:
                  - type: object
                    properties:
                      facets:
                        type: array
                        items:
                          anyOf:
                            - type: object
                              properties:
                                key:
                                  type: string
                                kind:
                                  type: string
                                  const: categorical
                                label:
                                  type: string
                                group:
                                  type: string
                                  enum:
                                    - trace
                                    - evaluation
                                    - span
                                    - metadata
                                    - prompt
                                topValues:
                                  type: array
                                  items:
                                    type: object
                                    properties:
                                      value:
                                        type: string
                                      label:
                                        type: string
                                      count:
                                        type: number
                                      aggregates:
                                        type: object
                                        properties:
                                          passedCount:
                                            type: number
                                          failedCount:
                                            type: number
                                          erroredCount:
                                            type: number
                                          scoreMin:
                                            type:
                                              - number
                                              - 'null'
                                          scoreMax:
                                            type:
                                              - number
                                              - 'null'
                                          hasScore:
                                            type: boolean
                                          distinctScores:
                                            type: number
                                          hasLabel:
                                            type: boolean
                                          labelValues:
                                            type: array
                                            items:
                                              type: object
                                              properties:
                                                value:
                                                  type: string
                                                count:
                                                  type: number
                                              required:
                                                - value
                                                - count
                                        required:
                                          - passedCount
                                          - failedCount
                                          - erroredCount
                                          - scoreMin
                                          - scoreMax
                                          - hasScore
                                          - distinctScores
                                          - hasLabel
                                      eventMetrics:
                                        type: array
                                        items:
                                          type: object
                                          properties:
                                            key:
                                              type: string
                                            values:
                                              type: array
                                              items:
                                                type: object
                                                properties:
                                                  value:
                                                    type: string
                                                  count:
                                                    type: number
                                                required:
                                                  - value
                                                  - count
                                          required:
                                            - key
                                            - values
                                    required:
                                      - value
                                      - count
                                totalDistinct:
                                  type: number
                              required:
                                - key
                                - kind
                                - label
                                - group
                                - topValues
                                - totalDistinct
                            - type: object
                              properties:
                                key:
                                  type: string
                                kind:
                                  type: string
                                  const: range
                                label:
                                  type: string
                                group:
                                  type: string
                                  enum:
                                    - trace
                                    - evaluation
                                    - span
                                    - metadata
                                    - prompt
                                min:
                                  type: number
                                max:
                                  type: number
                                discrete:
                                  type: object
                                  properties:
                                    values:
                                      type: array
                                      items:
                                        type: object
                                        properties:
                                          value:
                                            type: number
                                          count:
                                            type: number
                                        required:
                                          - value
                                          - count
                                    distinctCount:
                                      type: number
                                  required:
                                    - values
                                    - distinctCount
                              required:
                                - key
                                - kind
                                - label
                                - group
                                - min
                                - max
                            - type: object
                              properties:
                                key:
                                  type: string
                                kind:
                                  type: string
                                  const: dynamic_keys
                                label:
                                  type: string
                                group:
                                  type: string
                                  enum:
                                    - trace
                                    - evaluation
                                    - span
                                    - metadata
                                    - prompt
                                topKeys:
                                  type: array
                                  items:
                                    type: object
                                    properties:
                                      value:
                                        type: string
                                      count:
                                        type: number
                                    required:
                                      - value
                                      - count
                                totalDistinct:
                                  type: number
                              required:
                                - key
                                - kind
                                - label
                                - group
                                - topKeys
                                - totalDistinct
                      pending:
                        type: boolean
                        description: >-
                          True when the payload is still being computed and what
                          you have is the last committed one, possibly empty.
                          Call again shortly.
                    required:
                      - facets
                      - pending
                  - type: object
                    properties:
                      values:
                        type: array
                        items:
                          type: object
                          properties:
                            value:
                              type: string
                            label:
                              type: string
                            count:
                              type: number
                          required:
                            - value
                            - count
                      total:
                        type: number
                        description: >-
                          Distinct values the field holds in the window, before
                          paging.
                      hasMore:
                        type: boolean
                    required:
                      - values
                      - total
                      - hasMore
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - error
                additionalProperties: false
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - error
                additionalProperties: false
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - error
                additionalProperties: false
        '422':
          description: Unprocessable Entity
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - error
                additionalProperties: false
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  message:
                    type: string
                required:
                  - error
                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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