---
title: "Post a reaction"
method: POST
path: "/v2/farcaster/reaction/"
tags: ["Reaction"]
---

# Post a reaction

`POST /v2/farcaster/reaction/`

Post a reaction (like or recast) to a given cast 
(In order to post a reaction `signer_uuid` must be approved)

## Request body

- ReactionReqBody
  - `idem` string — An Idempotency key is a unique identifier for the request. **Note:** 1) This is used to prevent duplicate requests. Use the same idem key on retry attempts. 2) This should be a unique identifier for each request. 3) Recommended format is a 16-character string generated by the developer at the time of making this request.
  - `reaction_type` 'Like' | 'Recast', required — Type of interaction a user can have with content on the Farcaster network. - Like: Express appreciation for the target content. Similar to "likes" or "favorites" on other platforms. - Recast: Share the target content with the user's followers, similar to a "retweet" or "reblog". Helps increase content visibility.
  - `signer_uuid` string, required — UUID of the signer. `signer_uuid` is paired with API key, can't use a `uuid` made with a different API key.
  - `target` string, required — Target cast hash (hex string starting with 0x) OR a valid URL.
  - `target_author_fid` integer — The unique identifier of a farcaster user or app (unsigned integer)

## Response `200`

Success

- OperationResponse
  - `message` string
  - `success` boolean

## Other responses

- `400` — Bad Request
- `403` — Forbidden
- `404` — Resource not found
- `500` — Server Error

---

[API](https://skmtc.dev/neynar/apis/neynar-api.md) · [All operations](https://skmtc.dev/neynar/apis/neynar-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/neynar/neynar-api/revisions/dbb91bfb0d1a/schema)