Case Converter API

Category: text

Convert text between multiple case formats: UPPER, lower, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, path/case, and more.

Endpoint

POST https://anythingtext.com/api/tools/case

Authentication Required Content-Type: application/json

Authentication

This API requires an API key. Generate one from the API Keys section in your dashboard settings.

Include the X-API-Key header in all API requests:

X-API-Key: atk_your_api_key_here

Rate Limiting

API requests are limited to 60 requests per minute per user. If you exceed this limit, the API returns a 429 Too Many Requests response.

Every response includes rate limit headers:

X-RateLimit-Limit: 60

X-RateLimit-Remaining: 57

X-RateLimit-Reset: 42

When rate limited, the response body contains:

{ "error": "Rate limit exceeded. Maximum 60 requests per minute.", "retryAfter": 42, "limit": 60 }

Request Parameters

Name	Type	Required	Description
`text`	String	Required	The text to convert `Example: hello world example`
`mode`	String	Required	Target case: upper, lower, title, sentence, camel, pascal, snake, kebab, constant, dot, path, toggle `Example: upper`

Response

Content-Type: application/json

Converted text in the requested case format

{
  "result": "HELLO WORLD EXAMPLE"
}

Error Responses

Status	Description	Body
`401`	Not authenticated	`{"error": "Please log in..."}`
`400`	Bad request / Missing required params	`{"error": "... is required"}`
`500`	Internal server error	`{"error": "Failed to ..."}`

cURL Example

curl -X POST https://anythingtext.com/api/tools/case \
  -H "Content-Type: application/json" \
  -H "X-API-Key: your_api_key_here" \
  -d '{"text": "hello world", "mode": "upper"}'

Code Samples

const response = await fetch('https://anythingtext.com/api/tools/case', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json',
        'X-API-Key': 'your_api_key_here'
    },
    body: JSON.stringify({"text": "hello world", "mode": "upper"})
});

const data = await response.json();
console.log('Result:', data);

import requests
import json

response = requests.post(
    'https://anythingtext.com/api/tools/case',
    json={'text': 'hello world', 'mode': 'upper'},
    headers={'X-API-Key': 'your_api_key_here'}
)

data = response.json()
print('Result:', data)

import java.net.URI;
import java.net.http.*;

HttpClient client = HttpClient.newHttpClient();
String json = "{\"text\": \"hello world\", \"mode\": \"upper\"}";

HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create("https://anythingtext.com/api/tools/case"))
    .header("Content-Type", "application/json")
    .header("X-API-Key", "your_api_key_here")
    .POST(HttpRequest.BodyPublishers.ofString(json))
    .build();

HttpResponse<String> response = client.send(request,
    HttpResponse.BodyHandlers.ofString());

System.out.println("Response: " + response.body());

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