Palindrome CheckerPalindrome Checker API

OnlineCredit Usage:1 per callRefreshed 1 month ago
avg: 356ms|p50: 337ms|p75: 369ms|p90: 407ms|p99: 484ms

Palindrome Checker is a tool for checking if text is a palindrome. It supports options to ignore case, spaces, and punctuation, and finds the longest palindromic substring.

The Palindrome Checker API provides reliable and fast access to palindrome checker data through a simple REST interface. Built for developers who need consistent, high-quality results with minimal setup time.

To use Palindrome Checker, you need an API key. You can get one by creating a free account and visiting your dashboard.

GET Endpoint

URL
https://api.apiverve.com/v1/palindromechecker

Code Examples

Here are examples of how to call the Palindrome Checker API in different programming languages:

cURL Request
curl -X GET \
  "https://api.apiverve.com/v1/palindromechecker?text=A%20man%20a%20plan%20a%20canal%20Panama&ignorecase=true&ignorespaces=true&ignorepunctuation=true" \
  -H "X-API-Key: your_api_key_here"
JavaScript (Fetch API)
const response = await fetch('https://api.apiverve.com/v1/palindromechecker?text=A%20man%20a%20plan%20a%20canal%20Panama&ignorecase=true&ignorespaces=true&ignorepunctuation=true', {
  method: 'GET',
  headers: {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
  }
});

const data = await response.json();
console.log(data);
Python (Requests)
import requests

headers = {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
}

response = requests.get('https://api.apiverve.com/v1/palindromechecker?text=A%20man%20a%20plan%20a%20canal%20Panama&ignorecase=true&ignorespaces=true&ignorepunctuation=true', headers=headers)

data = response.json()
print(data)
Node.js (Native HTTPS)
const https = require('https');
const url = require('url');

const options = {
  method: 'GET',
  headers: {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
  }
};

const req = https.request('https://api.apiverve.com/v1/palindromechecker?text=A%20man%20a%20plan%20a%20canal%20Panama&ignorecase=true&ignorespaces=true&ignorepunctuation=true', options, (res) => {
  let data = '';
  res.on('data', (chunk) => data += chunk);
  res.on('end', () => console.log(JSON.parse(data)));
});

req.end();
PHP (cURL)
<?php

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, 'https://api.apiverve.com/v1/palindromechecker?text=A%20man%20a%20plan%20a%20canal%20Panama&ignorecase=true&ignorespaces=true&ignorepunctuation=true');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'X-API-Key: your_api_key_here',
    'Content-Type: application/json'
]);

$response = curl_exec($ch);
curl_close($ch);

$data = json_decode($response, true);
print_r($data);

?>
Go (net/http)
package main

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

)

func main() {
    req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/palindromechecker?text=A%20man%20a%20plan%20a%20canal%20Panama&ignorecase=true&ignorespaces=true&ignorepunctuation=true", nil)

    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))
}
Ruby (Net::HTTP)
require 'net/http'
require 'json'

uri = URI('https://api.apiverve.com/v1/palindromechecker?text=A%20man%20a%20plan%20a%20canal%20Panama&ignorecase=true&ignorespaces=true&ignorepunctuation=true')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

request = Net::HTTP::Get.new(uri)
request['X-API-Key'] = 'your_api_key_here'
request['Content-Type'] = 'application/json'

response = http.request(request)
puts JSON.pretty_generate(JSON.parse(response.body))
C# (HttpClient)
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 response = await client.GetAsync("https://api.apiverve.com/v1/palindromechecker?text=A%20man%20a%20plan%20a%20canal%20Panama&ignorecase=true&ignorespaces=true&ignorepunctuation=true");
        response.EnsureSuccessStatusCode();

        var responseBody = await response.Content.ReadAsStringAsync();
        Console.WriteLine(responseBody);
    }
}

Authentication

The Palindrome Checker API requires authentication via API key. Include your API key in the request header:

Required Header
X-API-Key: your_api_key_here

Learn more about authentication →

Interactive API Playground

Test the Palindrome Checker API directly in your browser with live requests and responses.

Parameters

The following parameters are available for the Palindrome Checker API:

Check Palindrome

ParameterTypeRequiredDescriptionDefaultExample
textstringrequired
The text to check for palindrome
-A man a plan a canal Panama
ignorecasebooleanoptional
Ignore case when checking (default: true)
ignorespacesbooleanoptional
Ignore spaces when checking (default: true)
ignorepunctuationbooleanoptional
Ignore punctuation when checking (default: true)

Response

The Palindrome Checker API returns responses in JSON, XML, YAML, and CSV formats:

Example Responses

JSON Response
200 OK
{
  "status": "ok",
  "error": null,
  "data": {
    "text": "A man a plan a canal Panama",
    "is_palindrome": true,
    "cleaned_text": "amanaplanacanalpanama",
    "reversed_text": "amanaplanacanalpanama",
    "length": 21,
    "options": {
      "ignore_case": true,
      "ignore_spaces": true,
      "ignore_punctuation": true
    },
    "longest_palindrome_substring": "amanaplanacanalpanama",
    "longest_palindrome_length": 21
  }
}
XML Response
200 OK
<?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>
    <text>A man a plan a canal Panama</text>
    <is_palindrome>true</is_palindrome>
    <cleaned_text>amanaplanacanalpanama</cleaned_text>
    <reversed_text>amanaplanacanalpanama</reversed_text>
    <length>21</length>
    <options>
      <ignore_case>true</ignore_case>
      <ignore_spaces>true</ignore_spaces>
      <ignore_punctuation>true</ignore_punctuation>
    </options>
    <longest_palindrome_substring>amanaplanacanalpanama</longest_palindrome_substring>
    <longest_palindrome_length>21</longest_palindrome_length>
  </data>
</response>
YAML Response
200 OK
status: ok
error: null
data:
  text: A man a plan a canal Panama
  is_palindrome: true
  cleaned_text: amanaplanacanalpanama
  reversed_text: amanaplanacanalpanama
  length: 21
  options:
    ignore_case: true
    ignore_spaces: true
    ignore_punctuation: true
  longest_palindrome_substring: amanaplanacanalpanama
  longest_palindrome_length: 21
CSV Response
200 OK
keyvalue
textA man a plan a canal Panama
is_palindrometrue
cleaned_textamanaplanacanalpanama
reversed_textamanaplanacanalpanama
length21
options{ignore_case:true,ignore_spaces:true,ignore_punctuation:true}
longest_palindrome_substringamanaplanacanalpanama
longest_palindrome_length21

Response Structure

All API responses follow a consistent structure with the following fields:

FieldTypeDescriptionExample
statusstringIndicates whether the request was successful ("ok") or failed ("error")ok
errorstring | nullContains error message if status is "error", otherwise nullnull
dataobject | nullContains 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:

FieldTypeSample ValueDescription
textstring"A man a plan a canal Panama"-
is_palindromebooleantrue-
cleaned_textstring"amanaplanacanalpanama"-
reversed_textstring"amanaplanacanalpanama"-
lengthnumber21-
optionsobject{...}-
â”” ignore_casebooleantrue-
â”” ignore_spacesbooleantrue-
â”” ignore_punctuationbooleantrue-
longest_palindrome_substringstring"amanaplanacanalpanama"-
longest_palindrome_lengthnumber21-

Headers

Required and optional headers for Palindrome Checker API requests:

Header NameRequiredExample ValueDescription
X-API-Keyrequiredyour_api_key_hereYour APIVerve API key. Found in your dashboard under API Keys.
Acceptoptionalapplication/jsonSpecify response format: application/json (default), application/xml, or application/yaml
User-AgentoptionalMyApp/1.0Identifies your application for analytics and debugging purposes
X-Request-IDoptionalreq_123456789Custom request identifier for tracking and debugging requests
Cache-Controloptionalno-cacheControl caching behavior for the request and response

Learn more about request headers →

GraphQL AccessALPHA

Access Palindrome Checker through GraphQL to combine it with other API calls in a single request. Query only the palindrome checker data you need with precise field selection, and orchestrate complex data fetching workflows.

Test Palindrome Checker in the GraphQL Explorer to confirm availability and experiment with queries.

Credit Cost: Each API called in your GraphQL query consumes its standard credit cost.

GraphQL Endpoint
POST https://api.apiverve.com/v1/graphql
GraphQL Query Example
query {
  palindromechecker(
    input: {
      text: "A man a plan a canal Panama"
      ignorecase: true
      ignorespaces: true
      ignorepunctuation: true
    }
  ) {
    text
    is_palindrome
    cleaned_text
    reversed_text
    length
    options {
      ignore_case
      ignore_spaces
      ignore_punctuation
    }
    longest_palindrome_substring
    longest_palindrome_length
  }
}

Note: Authentication is handled via the x-api-key header in your GraphQL request, not as a query parameter.

CORS Support

The Palindrome Checker API supports Cross-Origin Resource Sharing (CORS) with wildcard configuration, allowing you to call Palindrome Checker directly from browser-based applications without proxy servers.

CORS HeaderValueDescription
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 Palindrome Checker directly from JavaScript running in the browser without encountering CORS errors. No proxy server or additional configuration needed.

Learn more about CORS support →

Rate Limiting

Palindrome Checker API requests are subject to rate limiting based on your subscription plan. These limits ensure fair usage and maintain service quality for all Palindrome Checker users.

PlanRate LimitDescription
Free5 requests/minHard rate limit enforced - exceeding will return 429 errors
StarterNo LimitProduction ready - standard traffic priority
ProNo LimitProduction ready - preferred traffic priority
MegaNo LimitProduction ready - highest traffic priority

Learn more about rate limiting →

Rate Limit Headers

When rate limits apply, each Palindrome Checker response includes headers to help you track your usage:

HeaderDescription
X-RateLimit-LimitMaximum number of requests allowed per time window
X-RateLimit-RemainingNumber of requests remaining in the current window
X-RateLimit-ResetUnix timestamp when the rate limit window resets

Handling Rate Limits

Free Plan: When you exceed your rate limit, Palindrome Checker 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 Palindrome Checker:

  • Monitor the rate limit headers to track your Palindrome Checker usage (Free plan only)
  • Cache palindrome checker responses where appropriate to reduce API calls
  • Upgrade to Pro or Mega for guaranteed no-throttle Palindrome Checker performance

Note: Palindrome Checker rate limits are separate from credit consumption. You may have credits remaining but still hit rate limits when using Palindrome Checker on Free tier.

Error Codes

The Palindrome Checker API uses standard HTTP status codes to indicate success or failure:

CodeMessageDescriptionSolution
200OKRequest successful, data returnedNo action needed - request was successful
400Bad RequestInvalid request parameters or malformed requestCheck required parameters and ensure values match expected formats
401UnauthorizedMissing or invalid API keyInclude x-api-key header with valid API key from dashboard
403ForbiddenAPI key lacks permission or insufficient creditsCheck credit balance in dashboard or upgrade plan
429Too Many RequestsRate limit exceeded (Free: 5 req/min)Implement request throttling or upgrade to paid plan
500Internal Server ErrorServer error occurredRetry request after a few seconds, contact support if persists
503Service UnavailableAPI temporarily unavailableWait 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 Palindrome Checker with SDKs

Get started quickly with official Palindrome Checker 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 Palindrome Checker with No-Code API Tools

Connect the Palindrome Checker API to your favorite automation platform without writing code. Build workflows that leverage palindrome checker data across thousands of apps.

All platforms use your same API key to access Palindrome Checker. Visit our integrations hub for step-by-step setup guides.

Frequently Asked Questions

How do I get an API key for Palindrome Checker?
Sign up for a free account at dashboard.apiverve.com. Your API key will be automatically generated and available in your dashboard. The same key works for Palindrome Checker and all other APIVerve APIs. The free plan includes 1,000 credits plus a 500 credit bonus.
How many credits does Palindrome Checker cost?

Each successful Palindrome Checker 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 palindrome checker lookups.

Can I use Palindrome Checker in production?

The free plan is for testing and development only. For production use of Palindrome Checker, 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 Palindrome Checker from a browser?
Yes! The Palindrome Checker API supports CORS with wildcard configuration, so you can call it directly from browser-based JavaScript without needing a proxy server. See the CORS section above for details.
What happens if I exceed my Palindrome Checker credit limit?

When you reach your monthly credit limit, Palindrome Checker 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.

What's Next?

Continue your journey with these recommended resources

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