---
title: "POST /v1/{innovationId}/threads/{threadId}/messages"
method: POST
path: "/v1/{innovationId}/threads/{threadId}/messages"
tags: ["[v1] Innovation Threads"]
---

# POST /v1/{innovationId}/threads/{threadId}/messages

`POST /v1/{innovationId}/threads/{threadId}/messages`

## Request

- Base URL: `https://nhse-${ENV}-innovation-service-innovation-functions.azurewebsites.net/api`
- URL: `https://nhse-${ENV}-innovation-service-innovation-functions.azurewebsites.net/api/v1/{innovationId}/threads/{threadId}/messages`
- Auth: none declared

Creates a new message in a thread.

## Path parameters

- `innovationId` string, uuid, required
- `threadId` string, uuid, required

## Request body

- object
  - `message` string, required
  - `file` object
    - `name` string, required
    - `description` string
    - `file` object, required
      - `id` string, required
      - `name` string, required
      - `size` number, float, required
      - `extension` string, required

## Response `200`

Message created.

- object
  - `threadMessage` object, required
    - `createdBy` object
      - `id` string, uuid, required
      - `identityId` string, required
    - `id` string, uuid, required
    - `message` string, required
    - `isEditable` boolean, required
    - `createdAt` string, date-time, required

## Other responses

- `400`: Bad request.
- `401`: Unauthorized.
- `403`: Forbidden.
- `404`: Not found.
- `500`: Internal server error.

## Changes

- **2024-11-07** `761f95f46b23`: 3 breaking, 1 warning, 8 info
  - for the `path` request parameter `innovationId`, the format changed from no format to `uuid`
  - for the `path` request parameter `threadId`, the format changed from no format to `uuid`
  - the request property `message` became required
  - the `message` request property's maxLength was set to `4000`
  - …8 more

[Operation history](https://skmtc.dev/nhs-england/apis/innovations-api-nhs-innovation-service/changes/v1/:innovationId/threads/:threadId/messages/post.md)

---

[API](https://skmtc.dev/nhs-england/apis/innovations-api-nhs-innovation-service.md) - [All operations](https://skmtc.dev/nhs-england/apis/innovations-api-nhs-innovation-service/llms.txt) - [OpenAPI document](https://skmtc.dev/nhs-england/apis/innovations-api-nhs-innovation-service/revisions/c7535c8a7a65?raw)