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

# Diff two document versions

> Line-oriented diff between two retained versions of a knowledge-base document. Returns added / removed / unchanged line counts plus unified-style hunk lines (`+` added, `-` removed, ` ` context). `truncated` is true when the inputs were too large for a line-level diff. Read-only; requires the `knowledge:read` scope.



## OpenAPI

````yaml /openapi.yaml get /api/v1/knowledge-bases/{id}/documents/{docId}/versions/diff
openapi: 3.1.0
info:
  title: Devotel CPaaS API
  description: Orbit by Devotel — Communications Platform as a Service API
  version: 1.0.0
  contact:
    name: Devotel
    url: https://devotel.io
    email: support@devotel.io
  license:
    name: Proprietary
servers:
  - url: https://api.orbit.devotel.io
    description: Production
security:
  - Bearer: []
  - ApiKey: []
tags:
  - name: Messages
    description: >-
      Send and manage messages across all channels (SMS, WhatsApp, RCS, Email,
      Viber, etc.)
  - name: Fax
    description: >-
      List and track fax (MMS/T.38) transmissions on Telnyx-backed fax numbers
      (sending flows through the Messaging API)
  - name: Agents
    description: AI agent creation, configuration, and execution
  - name: Voice
    description: Voice calls, IVR, conferencing, and SIP trunking
  - name: OnCall
    description: On-call rotations and escalation policy planning for incident alerting
  - name: Webhooks
    description: Webhook endpoint management and delivery logs
  - name: Numbers
    description: Phone number search, provisioning, and configuration
  - name: Brand Identity
    description: >-
      Unified cross-channel brand trust posture (10DLC, toll-free, WhatsApp,
      RCS, branded calling, number KYC)
  - name: Contacts
    description: Contact management, segmentation, and lifecycle tracking
  - name: Campaigns
    description: Marketing campaign orchestration and analytics
  - name: Flows
    description: Automation flow builder and execution engine
  - name: Templates
    description: Message template management and approval workflows
  - name: Settings
    description: Organization, channel, and user preference settings
  - name: Verify
    description: OTP generation and verification across channels
  - name: Push
    description: Push notification delivery via FCM and APNs
  - name: Integrations
    description: Third-party service connections and OAuth management
  - name: CDP
    description: >-
      Customer Data Platform — activation surface (CRM object sync, streaming
      destinations, ad-audience activation)
  - name: Files
    description: >-
      Server-to-server media upload, listing, retrieval, and deletion
      (signed-URL backed)
  - name: Commerce
    description: >-
      Omnichannel conversational-commerce — persistent cart + checkout state
      machine, channel-agnostic hosted pay-by-link, native WhatsApp checkout,
      and AP2-style agent payment mandates.
  - name: Sync
    description: >-
      Real-time shared-state primitive (Twilio Sync parity) — Documents, Maps,
      Lists, and ephemeral Streams, with change events relayed over the
      /api/v1/ws/sync WebSocket gateway
paths:
  /api/v1/knowledge-bases/{id}/documents/{docId}/versions/diff:
    get:
      tags:
        - Knowledge Bases
      summary: Diff two document versions
      description: >-
        Line-oriented diff between two retained versions of a knowledge-base
        document. Returns added / removed / unchanged line counts plus
        unified-style hunk lines (`+` added, `-` removed, ` ` context).
        `truncated` is true when the inputs were too large for a line-level
        diff. Read-only; requires the `knowledge:read` scope.
      parameters:
        - schema:
            type: string
          in: path
          name: id
          required: true
          description: Knowledge base ID (`kb_…`).
        - schema:
            type: string
          in: path
          name: docId
          required: true
          description: Document ID whose versions are compared.
        - schema:
            type: integer
            minimum: 1
          in: query
          name: from
          required: true
          description: 1-based version number to diff FROM (the older side).
        - schema:
            type: integer
            minimum: 1
          in: query
          name: to
          required: true
          description: 1-based version number to diff TO (the newer side).
      responses:
        '200':
          description: The line-oriented diff between the two requested versions.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: object
                    properties:
                      knowledge_base_id:
                        type: string
                      document_id:
                        type: string
                      from_version:
                        type: integer
                      to_version:
                        type: integer
                      added:
                        type: integer
                      removed:
                        type: integer
                      unchanged:
                        type: integer
                      truncated:
                        type: boolean
                        description: >-
                          True when the inputs were too large for a line-level
                          LCS diff.
                      hunks:
                        type: array
                        description: >-
                          Unified-style hunk lines (`+` added / `-` removed / `
                          ` context).
                        items:
                          type: string
                  meta:
                    type: object
                    properties:
                      request_id:
                        type: string
                      timestamp:
                        type: string
                        format: date-time
        '422':
          description: >-
            One of the requested versions was not retained (its content exceeded
            the retention size cap) and cannot be diffed.
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: object
                    properties:
                      code:
                        type: string
                      message:
                        type: string
                      status:
                        type: integer
components:
  securitySchemes:
    Bearer:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: Dashboard JWT token from Clerk
    ApiKey:
      type: apiKey
      name: X-API-Key
      in: header
      description: Server-to-server API key (dv_live_sk_*)

````