Instead of ‘login’ and ‘password’ use your credentials from https://app.dataforseo.com/api-access

            

# Instead of 'login' and 'password' use your credentials from https://app.dataforseo.com/api-access 
login="login" 
password="password" 
cred="$(printf ${login}:${password} | base64)" 
curl --location --request POST "https://api.dataforseo.com/v3/on_page/keyword_density" 
--header "Authorization: Basic ${cred}"  
--header "Content-Type: application/json" 
--data-raw "[
    {
        "id": "09101923-1535-0216-0000-2389a8854b70",
        "url": "https://dataforseo.com/",
        "keyword_length": 2,
        "filters": [
            "frequency",
            ">",
            5
        ]
    }
]"


        

<?php
// You can download this file from here https://cdn.dataforseo.com/v3/examples/php/php_RestClient.zip
require('RestClient.php');
$api_url = 'https://api.dataforseo.com/';
// Instead of 'login' and 'password' use your credentials from https://app.dataforseo.com/api-access
$client = new RestClient($api_url, null, 'login', 'password');

$post_array = array();
// simple way to get a result
$post_array[] = array(
   "id" => "09101923-1535-0216-0000-2389a8854b70",
   "url" => "https://dataforseo.com/",
   "keyword_length" => 2,
   "filters" =>  [
            "frequency",
            ">",
            5
        ]
);
try {
   // POST /v3/on_page/keyword_density
   // the full list of possible parameters is available in documentation
   $result = $client->post('/v3/on_page/keyword_density', $post_array);
   print_r($result);
   // do something with post result
} catch (RestClientException $e) {
   echo "n";
   print "HTTP code: {$e->getHttpCode()}n";
   print "Error code: {$e->getCode()}n";
   print "Message: {$e->getMessage()}n";
   print  $e->getTraceAsString();
   echo "n";
}
$client = null;
?>

            

from random import Random
from client import RestClient
# You can download this file from here https://api.dataforseo.com/v3/_examples/python/_python_Client.zip
client = RestClient("login", "password")

post_data = dict()
# simple way to get a result
post_data[len(post_data)] = dict(
    id="09101923-1535-0216-0000-2389a8854b70",
    url="https://dataforseo.com/",
    keyword_length: 2,
    filters=["frequency", ">", 5]
)
# POST /v3/on_page/keyword_density
# the full list of possible parameters is available in documentation
response = client.post("/v3/on_page/keyword_density", post_data)
# you can find the full list of the response codes here https://docs.dataforseo.com/v3/appendix/errors
if response["status_code"] == 20000:
    print(response)
    # do something with result
else:
    print("error. Code: %d Message: %s" % (response["status_code"], response["status_message"]))


        

            


const post_array = [];

post_array.push({
  "id": "09101923-1535-0216-0000-2389a8854b70",
  "url": "https://dataforseo.com/",
  "keyword_length": 2,    
  "filters": ["frequency", ">", 5]
});

const axios = require('axios');

axios({
  method: 'post',
  url: 'https://api.dataforseo.com/v3/on_page/keyword_density',
  auth: {
    username: 'login',
    password: 'password'
  },
  data: post_array,
  headers: {
    'content-type': 'application/json'
  }
}).then(function (response) {
  var result = response['data']['tasks'];
  // Result data
  console.log(result);
}).catch(function (error) {
  console.log(error);
});


        

            

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

namespace DataForSeoDemos
{
    public static partial class Demos
    {
        public static async Task on_page_keyword_density()
        {
            var httpClient = new HttpClient
            {
                BaseAddress = new Uri("https://api.dataforseo.com/"),
                // Instead of 'login' and 'password' use your credentials from https://app.dataforseo.com/api-access
                DefaultRequestHeaders = { Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.ASCII.GetBytes("login:password"))) }
            };
            var postData = new List<object>();
            // simple way to get a result
            postData.Add(new
            {
                id = "07281559-0695-0216-0000-c269be8b7592",
                page_from = "/apis/google-trends-api",
                keyword_length: 2,    
                filters = new object[]
                { 
                    new object[] { "frequency", ">", 5 }
                }
            });
            // POST /v3/on_page/keyword_density
            // the full list of possible parameters is available in documentation
            var taskPostResponse = await httpClient.PostAsync("/v3/on_page/keyword_density", new StringContent(JsonConvert.SerializeObject(postData)));
            var result = JsonConvert.DeserializeObject<dynamic>(await taskPostResponse.Content.ReadAsStringAsync());
            // you can find the full list of the response codes here https://docs.dataforseo.com/v3/appendix/errors
            if (result.status_code == 20000)
            {
                // do something with result
                Console.WriteLine(result);
            }
            else
                Console.WriteLine($"error. Code: {result.status_code} Message: {result.status_message}");
        }
    }
}

        

The above command returns JSON structured like this:

{
  "version": "0.1.20210907",
  "status_code": 20000,
  "status_message": "Ok.",
  "time": "0.2239 sec.",
  "cost": 0,
  "tasks_count": 1,
  "tasks_error": 0,
  "tasks": [
    {
      "id": "09101923-1535-0216-0000-2389a8854b70",
      "status_code": 20000,
      "status_message": "Ok.",
      "time": "0.1548 sec.",
      "cost": 0,
      "result_count": 1,
      "path": [
        "v3",
        "on_page",
        "keyword_density"
      ],
      "data": {
        "api": "on_page",
        "function": "keyword_density",
        "url": "https://dataforseo.com/",
        "keyword_length": 2,
        "order_by": [
          "frequency,desc"
        ],
        "filters": [
          "frequency",
          ">",
          5
        ],
        "target": "dataforseo.com",
        "max_crawl_pages": 10,
        "calculate_keyword_density": true
      },
      "result": [
        {
          "crawl_progress": "finished",
          "crawl_status": {
            "max_crawl_pages": 10,
            "pages_in_queue": 0,
            "pages_crawled": 10
          },
          "total_items_count": 10,
          "items_count": 10,
          "items": [
            {
              "keyword": "read more",
              "frequency": 9,
              "density": 0.007569386038687973
            },
            {
              "keyword": "data api",
              "frequency": 8,
              "density": 0.00672834314550042
            },
            {
              "keyword": "we can",
              "frequency": 8,
              "density": 0.00672834314550042
            },
            {
              "keyword": "serp api",
              "frequency": 6,
              "density": 0.005046257359125316
            },
            {
              "keyword": "docs api",
              "frequency": 6,
              "density": 0.005046257359125316
            },
            {
              "keyword": "see success",
              "frequency": 6,
              "density": 0.005046257359125316
            },
            {
              "keyword": "seo software",
              "frequency": 6,
              "density": 0.005046257359125316
            },
            {
              "keyword": "analytics api",
              "frequency": 6,
              "density": 0.005046257359125316
            },
            {
              "keyword": "success story",
              "frequency": 6,
              "density": 0.005046257359125316
            },
            {
              "keyword": "google shopping",
              "frequency": 6,
              "density": 0.005046257359125316
            }
          ]
        }
      ]
    }
  ]
}