HMAC Generator API
HMAC Generator creates Hash-based Message Authentication Codes for data integrity and authentication. Supports SHA-256, SHA-384, SHA-512, SHA-1, and MD5 algorithms.
The HMAC Generator API provides reliable and fast access to hmac generator data through a simple REST interface. Built for developers who need consistent, high-quality results with minimal setup time.
To use HMAC Generator, you need an API key. You can get one by creating a free account and visiting your dashboard.
POST Endpoint
https://api.apiverve.com/v1/hmacCode Examples
Here are examples of how to call the HMAC Generator API in different programming languages:
curl -X POST \
"https://api.apiverve.com/v1/hmac" \
-H "X-API-Key: your_api_key_here" \
-H "Content-Type: application/json" \
-d '{
"message": "Hello World",
"secret": "my-secret-key",
"algorithm": "sha256",
"encoding": "hex"
}'const response = await fetch('https://api.apiverve.com/v1/hmac', {
method: 'POST',
headers: {
'X-API-Key': 'your_api_key_here',
'Content-Type': 'application/json'
},
body: JSON.stringify({
"message": "Hello World",
"secret": "my-secret-key",
"algorithm": "sha256",
"encoding": "hex"
})
});
const data = await response.json();
console.log(data);import requests
headers = {
'X-API-Key': 'your_api_key_here',
'Content-Type': 'application/json'
}
payload = {
"message": "Hello World",
"secret": "my-secret-key",
"algorithm": "sha256",
"encoding": "hex"
}
response = requests.post('https://api.apiverve.com/v1/hmac', headers=headers, json=payload)
data = response.json()
print(data)const https = require('https');
const url = require('url');
const options = {
method: 'POST',
headers: {
'X-API-Key': 'your_api_key_here',
'Content-Type': 'application/json'
}
};
const postData = JSON.stringify({
"message": "Hello World",
"secret": "my-secret-key",
"algorithm": "sha256",
"encoding": "hex"
});
const req = https.request('https://api.apiverve.com/v1/hmac', options, (res) => {
let data = '';
res.on('data', (chunk) => data += chunk);
res.on('end', () => console.log(JSON.parse(data)));
});
req.write(postData);
req.end();<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api.apiverve.com/v1/hmac');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($ch, CURLOPT_HTTPHEADER, [
'X-API-Key: your_api_key_here',
'Content-Type: application/json'
]);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode({
'message': 'Hello World',
'secret': 'my-secret-key',
'algorithm': 'sha256',
'encoding': 'hex'
}));
$response = curl_exec($ch);
curl_close($ch);
$data = json_decode($response, true);
print_r($data);
?>package main
import (
"fmt"
"io"
"net/http"
"bytes"
"encoding/json"
)
func main() {
payload := map[string]interface{}{
"message": "Hello World",
"secret": "my-secret-key",
"algorithm": "sha256",
"encoding": "hex"
}
jsonPayload, _ := json.Marshal(payload)
req, _ := http.NewRequest("POST", "https://api.apiverve.com/v1/hmac", bytes.NewBuffer(jsonPayload))
req.Header.Set("X-API-Key", "your_api_key_here")
req.Header.Set("Content-Type", "application/json")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
body, _ := io.ReadAll(resp.Body)
fmt.Println(string(body))
}require 'net/http'
require 'json'
uri = URI('https://api.apiverve.com/v1/hmac')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
payload = {
"message": "Hello World",
"secret": "my-secret-key",
"algorithm": "sha256",
"encoding": "hex"
}
request = Net::HTTP::Post.new(uri)
request['X-API-Key'] = 'your_api_key_here'
request['Content-Type'] = 'application/json'
request.body = payload.to_json
response = http.request(request)
puts JSON.pretty_generate(JSON.parse(response.body))using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
class Program
{
static async Task Main(string[] args)
{
using var client = new HttpClient();
client.DefaultRequestHeaders.Add("X-API-Key", "your_api_key_here");
var jsonContent = @"{
""message"": ""Hello World"",
""secret"": ""my-secret-key"",
""algorithm"": ""sha256"",
""encoding"": ""hex""
}";
var content = new StringContent(jsonContent, Encoding.UTF8, "application/json");
var response = await client.PostAsync("https://api.apiverve.com/v1/hmac", content);
response.EnsureSuccessStatusCode();
var responseBody = await response.Content.ReadAsStringAsync();
Console.WriteLine(responseBody);
}
}Authentication
The HMAC Generator API requires authentication via API key. Include your API key in the request header:
X-API-Key: your_api_key_hereInteractive API Playground
Test the HMAC Generator API directly in your browser with live requests and responses.
Parameters
The following parameters are available for the HMAC Generator API:
Generate HMAC
| Parameter | Type | Required | Description | Default | Example |
|---|---|---|---|---|---|
message | string | required | The message to sign | - | |
secret | string | required | The secret key for HMAC generation | - | |
algorithm | string | optional | Hash algorithm to use Supported values: sha256sha384sha512sha1md5 | ||
encoding | string | optional | Output encoding format Supported values: hexbase64 |
Response
The HMAC Generator API returns responses in JSON, XML, YAML, and CSV formats:
Example Responses
{
"status": "ok",
"error": null,
"data": {
"hmac": "2cd7c25025198d4458002ceb064ad37ccfbbe46650876d693f5e080bd954e449",
"algorithm": "sha256",
"encoding": "hex"
}
}<?xml version="1.0" encoding="UTF-8"?>
<response>
<status>ok</status>
<error xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
<data>
<hmac>2cd7c25025198d4458002ceb064ad37ccfbbe46650876d693f5e080bd954e449</hmac>
<algorithm>sha256</algorithm>
<encoding>hex</encoding>
</data>
</response>
status: ok
error: null
data:
hmac: 2cd7c25025198d4458002ceb064ad37ccfbbe46650876d693f5e080bd954e449
algorithm: sha256
encoding: hex
| key | value |
|---|---|
| hmac | 2cd7c25025198d4458002ceb064ad37ccfbbe46650876d693f5e080bd954e449 |
| algorithm | sha256 |
| encoding | hex |
Response Structure
All API responses follow a consistent structure with the following fields:
| Field | Type | Description | Example |
|---|---|---|---|
status | string | Indicates whether the request was successful ("ok") or failed ("error") | ok |
error | string | null | Contains error message if status is "error", otherwise null | null |
data | object | null | Contains the API response data if successful, otherwise null | {...} |
Learn more about response formats →
Response Data Fields
When the request is successful, the data object contains the following fields:
| Field | Type | Sample Value | Description |
|---|---|---|---|
hmacPremium | string | Generated HMAC signature in specified encoding format | |
algorithm | string | Hash algorithm used for HMAC generation | |
encoding | string | Output encoding format applied to the signature |
Headers
Required and optional headers for HMAC Generator API requests:
| Header Name | Required | Example Value | Description |
|---|---|---|---|
X-API-Key | required | your_api_key_here | Your APIVerve API key. Found in your dashboard under API Keys. |
Accept | optional | application/json | Specify response format: application/json (default), application/xml, or application/yaml |
User-Agent | optional | MyApp/1.0 | Identifies your application for analytics and debugging purposes |
X-Request-ID | optional | req_123456789 | Custom request identifier for tracking and debugging requests |
Cache-Control | optional | no-cache | Control caching behavior for the request and response |
GraphQL AccessALPHA
Access HMAC Generator through GraphQL to combine it with other API calls in a single request. Query only the hmac generator data you need with precise field selection, and orchestrate complex data fetching workflows.
Credit Cost: Each API called in your GraphQL query consumes its standard credit cost.
POST https://api.apiverve.com/v1/graphqlquery {
hmac(
input: {
message: "Hello World"
secret: "my-secret-key"
algorithm: "sha256"
encoding: "hex"
}
) {
hmac
algorithm
encoding
}
}Note: Authentication is handled via the x-api-key header in your GraphQL request, not as a query parameter.
CORS Support
The HMAC Generator API supports Cross-Origin Resource Sharing (CORS) with wildcard configuration, allowing you to call HMAC Generator directly from browser-based applications without proxy servers.
| CORS Header | Value | Description |
|---|---|---|
Access-Control-Allow-Origin | * | Accepts requests from any origin |
Access-Control-Allow-Methods | * | Accepts any HTTP method |
Access-Control-Allow-Headers | * | Accepts any request headers |
Browser Usage: You can call HMAC Generator directly from JavaScript running in the browser without encountering CORS errors. No proxy server or additional configuration needed.
Rate Limiting
HMAC Generator API requests are subject to rate limiting based on your subscription plan. These limits ensure fair usage and maintain service quality for all HMAC Generator users.
| Plan | Rate Limit | Description |
|---|---|---|
| Free | 5 requests/min | Hard rate limit enforced - exceeding will return 429 errors |
| Starter | No Limit | Production ready - standard traffic priority |
| Pro | No Limit | Production ready - preferred traffic priority |
| Mega | No Limit | Production ready - highest traffic priority |
Learn more about rate limiting →
Rate Limit Headers
When rate limits apply, each HMAC Generator response includes headers to help you track your usage:
| Header | Description |
|---|---|
X-RateLimit-Limit | Maximum number of requests allowed per time window |
X-RateLimit-Remaining | Number of requests remaining in the current window |
X-RateLimit-Reset | Unix timestamp when the rate limit window resets |
Handling Rate Limits
Free Plan: When you exceed your rate limit, HMAC Generator returns a 429 Too Many Requests status code. Your application should implement appropriate backoff logic to handle this gracefully.
Paid Plans: No rate limiting or throttling applied. All paid plans (Starter, Pro, Mega) are production-ready.
Best Practices for HMAC Generator:
- Monitor the rate limit headers to track your HMAC Generator usage (Free plan only)
- Cache hmac generator responses where appropriate to reduce API calls
- Upgrade to Pro or Mega for guaranteed no-throttle HMAC Generator performance
Note: HMAC Generator rate limits are separate from credit consumption. You may have credits remaining but still hit rate limits when using HMAC Generator on Free tier.
Error Codes
The HMAC Generator API uses standard HTTP status codes to indicate success or failure:
| Code | Message | Description | Solution |
|---|---|---|---|
200 | OK | Request successful, data returned | No action needed - request was successful |
400 | Bad Request | Invalid request parameters or malformed request | Check required parameters and ensure values match expected formats |
401 | Unauthorized | Missing or invalid API key | Include x-api-key header with valid API key from dashboard |
403 | Forbidden | API key lacks permission or insufficient credits | Check credit balance in dashboard or upgrade plan |
429 | Too Many Requests | Rate limit exceeded (Free: 5 req/min) | Implement request throttling or upgrade to paid plan |
500 | Internal Server Error | Server error occurred | Retry request after a few seconds, contact support if persists |
503 | Service Unavailable | API temporarily unavailable | Wait and retry, check status page for maintenance updates |
Learn more about error handling →
Need help? Contact support with your X-Request-ID for assistance.
Integrate HMAC Generator with SDKs
Get started quickly with official HMAC Generator SDKs for your preferred language. Each library handles authentication, request formatting, and error handling automatically.
Available for Node.js, Python, C#/.NET, and Android/Java. All SDKs are open source and regularly updated.
Integrate HMAC Generator with No-Code API Tools
Connect the HMAC Generator API to your favorite automation platform without writing code. Build workflows that leverage hmac generator data across thousands of apps.





All platforms use your same API key to access HMAC Generator. Visit our integrations hub for step-by-step setup guides.
Frequently Asked Questions
How do I get an API key for HMAC Generator?
How many credits does HMAC Generator cost?
Each successful HMAC Generator API call consumes credits based on plan tier. Check the pricing section above for the exact credit cost. Failed requests and errors don't consume credits, so you only pay for successful hmac generator lookups.
Can I use HMAC Generator in production?
The free plan is for testing and development only. For production use of HMAC Generator, upgrade to a paid plan (Starter, Pro, or Mega) which includes commercial use rights, no attribution requirements, and guaranteed uptime SLAs. All paid plans are production-ready.
Can I use HMAC Generator from a browser?
What happens if I exceed my HMAC Generator credit limit?
When you reach your monthly credit limit, HMAC Generator API requests will return an error until you upgrade your plan or wait for the next billing cycle. You'll receive notifications at 80% and 95% usage to give you time to upgrade if needed.



