Keyword Extractor API
Keyword Extractor is a simple tool for extracting keywords from a web page. It returns the keywords and the frequency of each keyword.
The Keyword Extractor API provides reliable and fast access to keyword extractor data through a simple REST interface. Built for developers who need consistent, high-quality results with minimal setup time.
To use Keyword Extractor, 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/keywordextractorCode Examples
Here are examples of how to call the Keyword Extractor API in different programming languages:
curl -X POST \
"https://api.apiverve.com/v1/keywordextractor" \
-H "X-API-Key: your_api_key_here" \
-H "Content-Type: application/json" \
-d '{
"url": "https://en.wikipedia.org/wiki/Email_address"
}'const response = await fetch('https://api.apiverve.com/v1/keywordextractor', {
method: 'POST',
headers: {
'X-API-Key': 'your_api_key_here',
'Content-Type': 'application/json'
},
body: JSON.stringify({
"url": "https://en.wikipedia.org/wiki/Email_address"
})
});
const data = await response.json();
console.log(data);import requests
headers = {
'X-API-Key': 'your_api_key_here',
'Content-Type': 'application/json'
}
payload = {
"url": "https://en.wikipedia.org/wiki/Email_address"
}
response = requests.post('https://api.apiverve.com/v1/keywordextractor', 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({
"url": "https://en.wikipedia.org/wiki/Email_address"
});
const req = https.request('https://api.apiverve.com/v1/keywordextractor', 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/keywordextractor');
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({
'url': 'https://en.wikipedia.org/wiki/Email_address'
}));
$response = curl_exec($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{}{
"url": "https://en.wikipedia.org/wiki/Email_address"
}
jsonPayload, _ := json.Marshal(payload)
req, _ := http.NewRequest("POST", "https://api.apiverve.com/v1/keywordextractor", 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/keywordextractor')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
payload = {
"url": "https://en.wikipedia.org/wiki/Email_address"
}
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 = @"{
""url"": ""https://en.wikipedia.org/wiki/Email_address""
}";
var content = new StringContent(jsonContent, Encoding.UTF8, "application/json");
var response = await client.PostAsync("https://api.apiverve.com/v1/keywordextractor", content);
response.EnsureSuccessStatusCode();
var responseBody = await response.Content.ReadAsStringAsync();
Console.WriteLine(responseBody);
}
}Authentication
The Keyword Extractor 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 Keyword Extractor API directly in your browser with live requests and responses.
Parameters
The Keyword Extractor API supports multiple query options. Use one of the following:
Option 1: Extract Keywords from Text
| Parameter | Type | Required | Description | Default | Example |
|---|---|---|---|---|---|
text | string | required | The text to extract keywords from | - |
Option 2: Extract Keywords from URL
| Parameter | Type | Required | Description | Default | Example |
|---|---|---|---|---|---|
url | string | required | URL of a web page to extract keywords from | - |
Response
The Keyword Extractor API returns responses in JSON, XML, YAML, and CSV formats:
Example Responses
{
"status": "ok",
"error": null,
"data": {
"url": "https://en.wikipedia.org/wiki/Email_address",
"keywordCount": 50,
"topKeyword": "email",
"totalOccurrences": 672,
"keywords": {
"email": 94,
"address": 61,
"mail": 52,
"domain": 34,
"addresses": 34,
"characters": 27,
"retrieved": 27,
"internet": 17,
"message": 15,
"validation": 12
},
"topKeywords": [
{
"keyword": "email",
"count": 94,
"percentage": 14
},
{
"keyword": "address",
"count": 61,
"percentage": 9.1
},
{
"keyword": "mail",
"count": 52,
"percentage": 7.7
},
{
"keyword": "domain",
"count": 34,
"percentage": 5.1
},
{
"keyword": "addresses",
"count": 34,
"percentage": 5.1
}
]
}
}<?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>
<url>https://en.wikipedia.org/wiki/Email_address</url>
<keywordCount>50</keywordCount>
<topKeyword>email</topKeyword>
<totalOccurrences>672</totalOccurrences>
<keywords>
<email>94</email>
<address>61</address>
<mail>52</mail>
<domain>34</domain>
<addresses>34</addresses>
<characters>27</characters>
<retrieved>27</retrieved>
<internet>17</internet>
<message>15</message>
<validation>12</validation>
</keywords>
<topKeywords>
<topKeyword>
<keyword>email</keyword>
<count>94</count>
<percentage>14</percentage>
</topKeyword>
<topKeyword>
<keyword>address</keyword>
<count>61</count>
<percentage>9.1</percentage>
</topKeyword>
<topKeyword>
<keyword>mail</keyword>
<count>52</count>
<percentage>7.7</percentage>
</topKeyword>
<topKeyword>
<keyword>domain</keyword>
<count>34</count>
<percentage>5.1</percentage>
</topKeyword>
<topKeyword>
<keyword>addresses</keyword>
<count>34</count>
<percentage>5.1</percentage>
</topKeyword>
</topKeywords>
</data>
</response>
status: ok
error: null
data:
url: https://en.wikipedia.org/wiki/Email_address
keywordCount: 50
topKeyword: email
totalOccurrences: 672
keywords:
email: 94
address: 61
mail: 52
domain: 34
addresses: 34
characters: 27
retrieved: 27
internet: 17
message: 15
validation: 12
topKeywords:
- keyword: email
count: 94
percentage: 14
- keyword: address
count: 61
percentage: 9.1
- keyword: mail
count: 52
percentage: 7.7
- keyword: domain
count: 34
percentage: 5.1
- keyword: addresses
count: 34
percentage: 5.1
| key | value |
|---|---|
| url | https://en.wikipedia.org/wiki/Email_address |
| keywordCount | 50 |
| topKeyword | |
| totalOccurrences | 672 |
| keywords | {email:94,address:61,mail:52,domain:34,addresses:34,characters:27,retrieved:27,internet:17,message:15,validation:12} |
| topKeywords | [{keyword:email,count:94,percentage:14},{keyword:address,count:61,percentage:9.1},{keyword:mail,count:52,percentage:7.7},{keyword:domain,count:34,percentage:5.1},{keyword:addresses,count:34,percentage:5.1}] |
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 |
|---|---|---|---|
url | string | - | |
keywordCount | number | - | |
topKeyword | string | The most frequently occurring keyword | |
totalOccurrences | number | Total sum of all keyword frequencies | |
keywords | object | - | |
â”” email | number | - | |
â”” address | number | - | |
â”” mail | number | - | |
â”” domain | number | - | |
â”” addresses | number | - | |
â”” characters | number | - | |
â”” retrieved | number | - | |
â”” internet | number | - | |
â”” message | number | - | |
â”” validation | number | - | |
| [ ] Array items: | array[5] | Top 5 keywords with counts and percentages | |
â”” keyword | string | - | |
â”” count | number | - | |
â”” percentage | number | - |
Headers
Required and optional headers for Keyword Extractor 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 Keyword Extractor through GraphQL to combine it with other API calls in a single request. Query only the keyword extractor 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 {
keywordextractor(
input: {
url: "https://en.wikipedia.org/wiki/Email_address"
}
) {
url
keywordCount
topKeyword
totalOccurrences
keywords {
email
address
mail
domain
addresses
characters
retrieved
internet
message
validation
}
topKeywords
}
}Note: Authentication is handled via the x-api-key header in your GraphQL request, not as a query parameter.
CORS Support
The Keyword Extractor API supports Cross-Origin Resource Sharing (CORS) with wildcard configuration, allowing you to call Keyword Extractor 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 Keyword Extractor directly from JavaScript running in the browser without encountering CORS errors. No proxy server or additional configuration needed.
Rate Limiting
Keyword Extractor API requests are subject to rate limiting based on your subscription plan. These limits ensure fair usage and maintain service quality for all Keyword Extractor 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 Keyword Extractor 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, Keyword Extractor 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 Keyword Extractor:
- Monitor the rate limit headers to track your Keyword Extractor usage (Free plan only)
- Cache keyword extractor responses where appropriate to reduce API calls
- Upgrade to Pro or Mega for guaranteed no-throttle Keyword Extractor performance
Note: Keyword Extractor rate limits are separate from credit consumption. You may have credits remaining but still hit rate limits when using Keyword Extractor on Free tier.
Error Codes
The Keyword Extractor 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 Keyword Extractor with SDKs
Get started quickly with official Keyword Extractor 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 Keyword Extractor with No-Code API Tools
Connect the Keyword Extractor API to your favorite automation platform without writing code. Build workflows that leverage keyword extractor data across thousands of apps.





All platforms use your same API key to access Keyword Extractor. Visit our integrations hub for step-by-step setup guides.
Frequently Asked Questions
How do I get an API key for Keyword Extractor?
How many credits does Keyword Extractor cost?
Each successful Keyword Extractor 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 keyword extractor lookups.
Can I use Keyword Extractor in production?
The free plan is for testing and development only. For production use of Keyword Extractor, 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 Keyword Extractor from a browser?
What happens if I exceed my Keyword Extractor credit limit?
When you reach your monthly credit limit, Keyword Extractor 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.



