---
title: "Add a Slot to a Lexicon"
method: POST
path: "/v2.0/lexicons/{lexiconId}/entries/{entryId}/slots"
tags: ["Lexicons"]
---

# Add a Slot to a Lexicon

`POST /v2.0/lexicons/{lexiconId}/entries/{entryId}/slots`

## Request

- Base URL: `https://api-trial.cognigy.ai/testing`
- URL: `https://api-trial.cognigy.ai/testing/v2.0/lexicons/{lexiconId}/entries/{entryId}/slots`
- Auth: one of:
  - API key in header `X-API-Key`
  - API key in query parameter `api_key`
  - API key in header `x-cxone-authorization`
  - OAuth 2
    - Authorization code: `/auth/oauth2/authorize`
    - Password
    - Token URL: `/auth/oauth2/token`
- TypeScript: <https://skmtc.dev/cognigy/apis/simulator-openapi-rest-ful-api-reference/docs/v2.0/lexicons/:lexiconId/entries/:entryId/slots/post.ts> (a function with typed inputs; its response is checked against the schema)

Adds a [Slot](https://docs.cognigy.com/ai/platform-features/nlu/slots/user-defined/lexicon) to a Lexicon.

## Path parameters

- `lexiconId` string, required
- `entryId` string, required

## Headers

- `Accept` 'application/json' | 'application/hal+json' | 'application/xml' | 'text/xml' | 'text/csv'

## Request body

- object
  - `value` string, required: a Lexicon Slot

## Response `201`

Successfully created the Slot.

## Other responses

- `400`: The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing)
- `401`: The request has not been applied because it lacks valid authentication credentials for the target resource.
- `402`: Upgrade your Plan to increase your Quota.
- `403`: The server understood the request but refuses to authorize it.
- `404`: The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.
- `405`: The method received in the request-line is known by the origin server but not supported by the target resource.
- `409`: The request conflicts with current state of the server.
- `413`: The request entity is larger than limits defined by server.
- `500`: The server encountered an unexpected condition that prevented it from fulfilling the request.
- `501`: The server does not support the functionality required to fulfill the request.
- `502`: The server, while acting as a gateway or proxy, received an invalid response from an inbound server it accessed while attempting to fulfill the request.
- `503`: The server is not ready to handle the request.
- `504`: The server, while acting as a gateway or proxy, did not receive a timely response from an upstream server it needed to access in order to complete the request.

---

[API](https://skmtc.dev/cognigy/apis/simulator-openapi-rest-ful-api-reference.md) - [All operations](https://skmtc.dev/cognigy/apis/simulator-openapi-rest-ful-api-reference/llms.txt) - [OpenAPI document](https://skmtc.dev/cognigy/apis/simulator-openapi-rest-ful-api-reference/revisions/85b2872bdfb7?raw)