Palindrome Checker API
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
https://api.apiverve.com/v1/palindromecheckerCode Examples
Here are examples of how to call the Palindrome Checker API in different programming languages:
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"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);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)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
$ch = curl_init();
curl_setopt($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);
?>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))
}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))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:
X-API-Key: your_api_key_hereInteractive 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
| Parameter | Type | Required | Description | Default | Example |
|---|---|---|---|---|---|
text | string | required | The text to check for palindrome | - | |
ignorecase | boolean | optional | Ignore case when checking (default: true) | ||
ignorespaces | boolean | optional | Ignore spaces when checking (default: true) | ||
ignorepunctuation | boolean | optional | Ignore punctuation when checking (default: true) |
Response
The Palindrome Checker API returns responses in JSON, XML, YAML, and CSV formats:
Example Responses
{
"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 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>
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
| key | value |
|---|---|
| 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 |
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 |
|---|---|---|---|
text | string | - | |
is_palindrome | boolean | - | |
cleaned_text | string | - | |
reversed_text | string | - | |
length | number | - | |
options | object | - | |
â”” ignore_case | boolean | - | |
â”” ignore_spaces | boolean | - | |
â”” ignore_punctuation | boolean | - | |
longest_palindrome_substring | string | - | |
longest_palindrome_length | number | - |
Headers
Required and optional headers for Palindrome Checker 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 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.
Credit Cost: Each API called in your GraphQL query consumes its standard credit cost.
POST https://api.apiverve.com/v1/graphqlquery {
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 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 Palindrome Checker directly from JavaScript running in the browser without encountering CORS errors. No proxy server or additional configuration needed.
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.
| 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 Palindrome Checker 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, 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:
| 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 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?
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?
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.



