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

# Preview an unsaved export template draft

> Render an **unsaved** template draft against a live document — supply `type` and
`fields` inline along with `document_id`. Ideal for iterating on markup before saving.

Preview requires HTML render mode (`fields.render_mode = "html"`). CSV/`*_data` and
label types are not previewable and return `422`.

See `POST /export-templates/{exportTemplateId}/preview` for how `document_id` maps to a
document by type and how `format` controls the response (JSON vs. raw PDF).




## OpenAPI

````yaml /api-reference/build.yaml post /export-templates/preview
openapi: 3.0.0
info:
  title: Luminous API
  version: 1.0.0
  description: API documentation for Luminous
servers:
  - url: https://{companyName}.api.joinluminous.com/external/api/v1
    variables:
      companyName:
        default: companyName
        description: Your company-specific subdomain
security: []
tags:
  - name: Products
    description: Get and manage products
  - name: Pricing
    description: Manage price schedules, levels, and customizations
  - name: BOMs
    description: Manage Bills of Materials (BOMs)
  - name: Labels
    description: Label rendering via Labelary ZPL service
  - name: Companies
    description: Manage business accounts and their associated data
  - name: Contacts
    description: Manage contact information for individuals
  - name: Suppliers
    description: Manage suppliers (factories) — vendors used on purchase orders
  - name: Supplier SKUs
    description: Manage per-supplier SKU and unit-cost overrides for products
  - name: Locations
    description: Manage warehouses and locations
  - name: Inventory
    description: Get and adjust product stock levels
  - name: Lots
    description: Create, update, and delete product lots (batches)
  - name: Transfer Orders
    description: Manage transfer orders
  - name: Fulfillment Orders
    description: Manage fulfillment orders and picklists
  - name: Freight
    description: >-
      Freightview LTL freight — quotes, booking and documents for fulfillment
      orders
  - name: Fulfillment Priority Lists
    description: Configure fulfillment routing priority lists
  - name: Purchase Orders
    description: Get and modify purchase orders
  - name: Supplier Portal
    description: >-
      Read a supplier's response to a purchase order and control the one-click
      portal link
  - name: Receiving Reports
    description: Manage receiving reports
  - name: Payment Obligations
    description: Manage payment obligations for purchase orders
  - name: Sales Orders
    description: Manage sales orders and sales order shipments
  - name: Purgatory
    description: >-
      Inspect and resolve non-posted sales orders in the purgatory staging
      workflow
  - name: PickFlow Warehouse
    description: >-
      Warehouse-floor lookups for PickFlow — barcode resolution, bin and product
      stock, bin search, and receivables
  - name: PickFlow Shipping
    description: >-
      Provider-agnostic shipping rates, services, packages, and label purchase
      for PickFlow
  - name: Cycle Counts
    description: >-
      Create, drive, and post PickFlow cycle counts — batches, per-warehouse
      sessions, and CSV import/export
  - name: Print Stations
    description: List paired print stations and enqueue print jobs to them
  - name: Invoices
    description: Get and manage invoices
  - name: Work Orders
    description: >-
      Manage work orders — production lifecycle, steps, materials, links,
      shipments, and comments
  - name: Production Batches
    description: Group and manage work orders as production batches
  - name: Bills
    description: >-
      Accounts payable bill management, payments, attachments, allocations, and
      variance
  - name: Prepayments
    description: Manage vendor prepayments and applications
  - name: Vendor Credits
    description: Manage vendor credits and applications
  - name: Vendor Returns
    description: Manage vendor returns and credit generation
  - name: Customer Returns
    description: Manage customer returns (sales returns), receiving, and restock behavior
  - name: Stock Snapshot
    description: Point-in-time stock snapshots with export support
  - name: Consumption
    description: Consumption reports and exports
  - name: Inventory Aging
    description: Cost-layer-based inventory aging reports
  - name: Bills Reports
    description: Accounts payable bills aging reports
  - name: Forecast
    description: Materialized forecast data
  - name: Reports
    description: Close the books, inventory discrepancy, transaction COGS, and EDI reports
  - name: Tags
    description: Add/remove tags across various resources
  - name: Custom Fields
    description: Get and set custom fields across various resources
  - name: Currency
    description: Currency configuration, exchange rates, and conversion
  - name: Drive
    description: >
      Browse, upload, tag and manage files in your Luminous Drive. An API token
      sees the shared

      drive only, never My Files or restricted folders and files. Every write
      and download made

      through the API is recorded in the file's activity log (`GET
      /file-cabinet/files/{id}/activity`)

      with `actor_kind: api_token`.
  - name: Integration Mappings
    description: Manage integration mappings for external systems
  - name: Integration Field Mappings
    description: Manage field-level mappings between Luminous and external systems
  - name: Automations
    description: Create, test, and inspect automation rules and their runs
paths:
  /export-templates/preview:
    post:
      tags:
        - Export Templates
      summary: Preview an unsaved export template draft
      description: >
        Render an **unsaved** template draft against a live document — supply
        `type` and

        `fields` inline along with `document_id`. Ideal for iterating on markup
        before saving.


        Preview requires HTML render mode (`fields.render_mode = "html"`).
        CSV/`*_data` and

        label types are not previewable and return `422`.


        See `POST /export-templates/{exportTemplateId}/preview` for how
        `document_id` maps to a

        document by type and how `format` controls the response (JSON vs. raw
        PDF).
      operationId: previewDraftExportTemplate
      requestBody:
        required: true
        content:
          application/json:
            schema:
              allOf:
                - type: object
                  description: >
                    Preview request. `document_id` is always required. For the
                    draft-preview endpoint

                    (`POST /export-templates/preview`), `type` and `fields` are
                    also required. For the

                    saved-preview endpoint (`POST
                    /export-templates/{id}/preview`), `type`/`fields` are

                    ignored — they come from the saved template.
                  required:
                    - document_id
                  properties:
                    document_id:
                      type: integer
                      minimum: 1
                      description: >-
                        ID of the live document to render against. Interpreted
                        by template type — see the endpoint description.
                      example: 12345
                    format:
                      type: string
                      enum:
                        - html
                        - pdf
                      default: html
                      description: >-
                        Output format. `html` returns JSON with rendered markup;
                        `pdf` returns a PDF (binary, or base64 in JSON when
                        `Accept: application/json`).
                    type:
                      type: string
                      description: >-
                        Template type. **Required for draft preview** (`POST
                        /export-templates/preview`); ignored for saved preview.
                      enum:
                        - packing_slip
                        - supplier_purchase_order
                        - assembly_order
                        - invoice_pdf
                        - work_order
                        - production_run
                        - sales_order
                    fields:
                      type: object
                      additionalProperties: true
                      description: >-
                        Raw template body (must be HTML render mode). **Required
                        for draft preview**; ignored for saved preview.
                - required:
                    - document_id
                    - type
                    - fields
            example:
              document_id: 12345
              format: html
              type: packing_slip
              fields:
                render_mode: html
                page:
                  size: A4
                  orientation: Portrait
                  highDpi: false
                headerHtml: '<h1>Packing Slip #{{orderNumber}}</h1>'
                itemsHeaderHtml: <tr><th>SKU</th><th>Qty</th></tr>
                itemRowHtml: >-
                  {{#orderLines}}<tr><td>{{sku}}</td><td>{{quantity}}</td></tr>{{/orderLines}}
                footerHtml: <div>{{shippingMethod}}</div>
      responses:
        '200':
          description: >-
            Rendered preview. JSON for `html` (or `pdf` with `Accept:
            application/json`); raw PDF bytes for `pdf`.
          content:
            application/json:
              schema:
                type: object
                description: >-
                  JSON preview result. `html` is present for `format=html`;
                  `pdf_base64` replaces it for `format=pdf` requested with
                  `Accept: application/json`.
                properties:
                  data:
                    type: object
                    properties:
                      type:
                        type: string
                        description: Resolved template type.
                        example: packing_slip
                      format:
                        type: string
                        enum:
                          - html
                          - pdf
                        example: html
                      paper_size:
                        type: string
                        nullable: true
                        description: Paper size used to render (HTML-mode paged templates).
                        example: A4
                      errors:
                        type: array
                        description: Render-time errors, if any (empty on a clean render).
                        items:
                          type: string
                      html:
                        type: string
                        nullable: true
                        description: Rendered HTML. Present when `format=html`.
                      pdf_base64:
                        type: string
                        nullable: true
                        description: >-
                          Base64-encoded PDF. Present when `format=pdf` and JSON
                          is requested.
            application/pdf:
              schema:
                type: string
                format: binary
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                type: object
                properties:
                  message:
                    type: string
        '404':
          description: Document not found.
          content:
            application/json:
              schema:
                type: object
                properties:
                  message:
                    type: string
        '422':
          description: >-
            Preview not possible or input invalid — e.g. non-HTML template,
            unsupported type, or missing `type`/`fields`.
          content:
            application/json:
              schema:
                type: object
                properties:
                  message:
                    type: string
                  errors:
                    type: object
                    additionalProperties:
                      type: array
                      items:
                        type: string
      security:
        - BearerAuth: []
components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: >-
        Authenticate using a bearer token. To create a token, navigate to
        /settings/api-tokens and click Create API Token.

````

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