---
title: "Batch create LibraryParameterDefinition"
method: POST
path: "/api/v3/library-parameter-definition:batch-create"
tags: ["Library Parameter Definition"]
---

# Batch create LibraryParameterDefinition

`POST /api/v3/library-parameter-definition:batch-create`

## Request

- Base URL: `https://{tenant_name}.benchling.com`
- URL: `https://{tenant_name}.benchling.com/api/v3/library-parameter-definition:batch-create`
- Auth: HTTP bearer

Batch create LibraryParameterDefinition synchronously in one transaction. Maximum 25 items per request.

## Headers

- `EARLY-ACCESS` string

## Request body

- object
  - `items` CreateLibraryParameterDefinitionInput[], required
    - `creatorId` string: Deprecated. This field is ignored — the creator is always set to the authenticated user.
    - `dataType` 'FLOAT' | 'DATETIME' | 'TEXT' | 'DROPDOWN', required: The data type of values recorded for this parameter. Determines which additional fields are required: `FLOAT` requires `unitTypeId`, `DROPDOWN` requires `schemaFieldSelectorId`. Cannot be changed after creation.
    - `description` string, required: A description of what this parameter measures or represents. Maximum 2048 characters.
    - `name` string, required: Display name for the parameter definition. Must contain at least one alphanumeric character. Maximum 44 characters.
    - `unitTypeId` string, nullable: The ID of the unit type for this parameter. Required when `dataType` is `FLOAT`, forbidden otherwise. Use `GET /benchling/unit-type/items` to list available unit types. Format: `qnty_XXXXXXXX`.

## Response `201`

Created

- LibraryParameterDefinitionBatchcreateResponse201
  - `items` LibraryParameterDefinition[], required
    - `__typename` string
    - `archiveReason` string, nullable
    - `archived` boolean
    - `createdAt` string, datetime
    - `creator` PrincipalRef
      - `__typename` string
      - `id` string, api_id
    - `dataType` 'AA_PART_LINK' | 'AA_SEQUENCE_LINK' | 'ASSAY_REQUEST_LINK' | 'ASSAY_RESULT_LINK' | 'ASSAY_RUN_LINK' | 'BATCH_LINK' | 'BLOB_LINK' | 'BOOLEAN' | 'CUSTOM_ENTITY_LINK' | 'DATE' | 'DATETIME' | 'DNA_SEQUENCE_LINK' | 'ENTITY_LINK' | 'ENTRY_LINK' | 'FLOAT' | 'INTEGER' | 'JSON' | 'LONG_TEXT' | 'MIXTURE_LINK' | 'MOLECULE_LINK' | 'BASE_MOLECULE_LINK' | 'PART_LINK' | 'RNA_PART_LINK' | 'RNA_SEQUENCE_LINK' | 'SAMPLE_LINK' | 'DROPDOWN' | 'STORAGE_LINK' | 'TEXT' | 'TRANSCRIPTION_LINK' | 'TRANSLATION_LINK'
    - `description` string
    - `id` string
    - `modifiedAt` string, datetime
    - `name` string
    - `unitType` UnitTypeRef
      - `__typename` string
      - `id` string, api_id

## Other responses

- `400`: Bad Request
- `403`: Forbidden
- `404`: Not Found
- `409`: Conflict
- `429`: Too Many Requests
- `500`: Internal Server Error

---

[API](https://skmtc.dev/benchling/apis/benchling-api.md) - [All operations](https://skmtc.dev/benchling/apis/benchling-api/llms.txt) - [OpenAPI document](https://skmtc.dev/benchling/apis/benchling-api/revisions/3873a10bf7b8?raw)