## Documentation Index

Fetch the complete documentation index at: [/llms.txt](https://docs.neynar.com/llms.txt)

Use this file to discover all available pages before exploring further.

By FID or cast

### cURL

```
curl --request GET \
  --url 'https://snapchain-api.neynar.com/v1/reactionById?reaction_type=Like' \
  --header 'x-api-key: NEYNAR_API_DOCS'
```

### Python

```
import requests

url = "https://snapchain-api.neynar.com/v1/reactionById?reaction_type=Like"

headers = {"x-api-key": "NEYNAR_API_DOCS"}

response = requests.get(url, headers=headers)

print(response.text)
```

### JavaScript (Fetch API)

```
const options = {method: 'GET', headers: {'x-api-key': 'NEYNAR_API_DOCS'}};

fetch('https://snapchain-api.neynar.com/v1/reactionById?reaction_type=Like', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));
```

### PHP

```
<?php

$curl = curl_init();

curl_setopt_array($curl, [\
  CURLOPT_URL => "https://snapchain-api.neynar.com/v1/reactionById?reaction_type=Like",\
  CURLOPT_RETURNTRANSFER => true,\
  CURLOPT_ENCODING => "",\
  CURLOPT_MAXREDIRS => 10,\
  CURLOPT_TIMEOUT => 30,\
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,\
  CURLOPT_CUSTOMREQUEST => "GET",\
  CURLOPT_HTTPHEADER => [\
    "x-api-key: NEYNAR_API_DOCS"\
  ],\
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
?>
```

### Go

```
package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

url := "https://snapchain-api.neynar.com/v1/reactionById?reaction_type=Like"

req, _ := http.NewRequest("GET", url, nil)

req.Header.Add("x-api-key", "NEYNAR_API_DOCS")

res, _ := http.DefaultClient.Do(req)

defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

fmt.Println(string(body))
}
```

### Unirest (Java)

```
HttpResponse<String> response = Unirest.get("https://snapchain-api.neynar.com/v1/reactionById?reaction_type=Like")
  .header("x-api-key", "NEYNAR_API_DOCS")
  .asString();
```

### Ruby

```
require 'uri'
require 'net/http'

url = URI("https://snapchain-api.neynar.com/v1/reactionById?reaction_type=Like")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["x-api-key"] = 'NEYNAR_API_DOCS'

response = http.request(request)
puts response.read_body
```

### Response Structure

200

```json
{
  "hash": "0xd2b1ddc6c88e865a33cb1a565e0058d757042974",
  "hashScheme": "HASH_SCHEME_BLAKE3",
  "signature": "aSDinaTvuI8gbWludGxpZnk=",
  "signatureScheme": "SIGNATURE_SCHEME_ED25519",
  "signer": "<string>",
  "data": {
    "type": "MESSAGE_TYPE_CAST_ADD",
    "fid": 2,
    "timestamp": 48994466,
    "network": "FARCASTER_NETWORK_MAINNET",
    "reactionBody": {
      "type": "Like",
      "targetCastId": {
        "fid": 2,
        "hash": "0x03aff391a6eb1772b20b4ead9a89f732be75fe27"
      },
      "targetUrl": "https://www.example.com/article"
    }
  }
}
```

### Error Response Structure

```json
{
  "errCode": "<string>",
  "presentable": true,
  "name": "<string>",
  "code": 123,
  "details": "<string>",
  "metadata": {
    "errcode": [
      "<string>"
    ]
  }
}
```

### Authorizations

**x-api-key**  
Type: string  
Location: header  
Default: NEYNAR_API_DOCS  
Required: Yes  
API key to authorize requests

### Query Parameters

- **fid**: integer, required, The FID of the reaction's creator
- **target_fid**: integer, required, The FID of the cast's creator
- **target_hash**: string, required, The cast's hash
- **reaction_type**: enum<string>, required, Type of interaction a user can have with content on the Farcaster network. Default: Like

Available options: 
- `Like`
- `Recast`

### Response

200  
Content-Type: application/json  
The requested Reaction.

- **hash**: string, required, Pattern: `^0x[0-9a-fA-F]{40}$`
- **hashScheme**: string, required, Default: HASH_SCHEME_BLAKE3  
- **signature**: string<byte>, required, Pattern: `^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$`
- **signatureScheme**: string, required, Default: SIGNATURE_SCHEME_ED25519
- **signer**: string, required, Pattern: `^0x[0-9a-fA-F]+$`
- **data**: object, required, Represents a user's reaction to content on the Farcaster network.