Convert text and code identifiers across 14 string casing conventions…
Convert text and code identifiers across 14 string casing conventions (camelCase, snake_case, PascalCase, kebab-case, CONSTANT_CASE, Title Case, etc.)
Request
- x-api-key: <your-api-key>
- Content-Type: application/json
Response
{
"result": {
"cases": {
"alternatingCase": "<alternating case>",
"camelCase": "<camel case>",
"cobolCase": "<cobol case>",
"constantCase": "<constant case>",
"dotCase": "<dot case>",
"kebabCase": "<kebab case>",
"lowerCase": "<lower case>",
"pascalCase": "<pascal case>",
"pathCase": "<path case>",
"sentenceCase": "<sentence case>",
"snakeCase": "<snake case>",
"titleCase": "Quarterly report",
"trainCase": "<train case>",
"upperCase": "<upper case>"
},
"output": "<output>"
},
"stats": {
"characterCount": 3,
"wordCount": 3,
"words": [
"<word>"
]
},
"status": "success",
"targetStyle": "<target style>",
"tokensDeducted": 1
}What it does
Convert text and code identifiers across 14 string casing conventions (camelCase, snake_case, PascalCase, kebab-case, CONSTANT_CASE, Title Case, etc.)
Request
Body
| Field | Type | Required | Description |
|---|---|---|---|
preserveAcronyms | boolean | no | Whether to preserve uppercase acronyms during tokenization. |
text | string | yes | Input text or code identifier string to transform. |
to | enum | no | Target casing style. Use "all" to receive a complete matrix breakdown. One of: all, camelCase, pascalCase, snakeCase, kebabCase, constantCase, cobolCase, titleCase…. |
Example request
{
"preserveAcronyms": false,
"text": "Hello from castomAPI.",
"to": "all"
}Response
| Field | Type | Description |
|---|---|---|
result | object | |
↳ cases | object | |
↳ output | string | |
stats | object | |
↳ characterCount | integer | |
↳ wordCount | integer | |
↳ words | array<string> | |
status | string | |
targetStyle | string | |
tokensDeducted | integer |
Example response
{
"result": {
"cases": {
"alternatingCase": "<alternating case>",
"camelCase": "<camel case>",
"cobolCase": "<cobol case>",
"constantCase": "<constant case>",
"dotCase": "<dot case>",
"kebabCase": "<kebab case>",
"lowerCase": "<lower case>",
"pascalCase": "<pascal case>",
"pathCase": "<path case>",
"sentenceCase": "<sentence case>",
"snakeCase": "<snake case>",
"titleCase": "Quarterly report",
"trainCase": "<train case>",
"upperCase": "<upper case>"
},
"output": "<output>"
},
"stats": {
"characterCount": 3,
"wordCount": 3,
"words": [
"<word>"
]
},
"status": "success",
"targetStyle": "<target style>",
"tokensDeducted": 1
}Errors
Every error answers with the same envelope: an HTTP status, a machine code and a sentence.
400 | The body or a parameter failed validation. The details array names the field. |
401 | No key, a revoked key or a wrong header. Send x-api-key. |
402 | The wallet cannot cover this call. Top up or wait for the monthly grant. |
404 | The resource does not exist, or it is not yours. Both answer identically and cost nothing. |
429 | Over the per-minute quota of your tier. Back off and retry. |
5xx | Upstream refused or timed out. The call is not billed. |
Code
curl -X POST 'https://app.castomapi.com/v1/convert/case' \
-H 'x-api-key: <your-api-key>' \
-H 'Content-Type: application/json' \
-d '{"preserveAcronyms": false, "text": "Hello from castomAPI.", "to": "all"}'const res = await fetch('https://app.castomapi.com/v1/convert/case', {
method: 'POST',
headers: { 'x-api-key': '<your-api-key>', 'Content-Type': 'application/json' },
body: JSON.stringify({"preserveAcronyms": false, "text": "Hello from castomAPI.", "to": "all"})
});
const data = await res.json();
console.log(data);import { request } from 'node:https';
// Node 18+ has fetch built in
const res = await fetch('https://app.castomapi.com/v1/convert/case', {
method: 'POST',
headers: { 'x-api-key': '<your-api-key>', 'Content-Type': 'application/json' },
body: JSON.stringify({"preserveAcronyms": false, "text": "Hello from castomAPI.", "to": "all"})
});
const data = await res.json();
console.log(data);import requests
res = requests.post(
'https://app.castomapi.com/v1/convert/case',
headers={'x-api-key': '<your-api-key>'},
json={"preserveAcronyms": False, "text": "Hello from castomAPI.", "to": "all"},
timeout=30,
)
print(res.json())<?php
$ch = curl_init('https://app.castomapi.com/v1/convert/case');
curl_setopt_array($ch, [
CURLOPT_CUSTOMREQUEST => 'POST',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_HTTPHEADER => ['x-api-key: <your-api-key>', 'Content-Type: application/json'],
CURLOPT_POSTFIELDS => json_encode(['preserveAcronyms' => false, 'text' => 'Hello from castomAPI.', 'to' => 'all']),
]);
$data = json_decode(curl_exec($ch), true);
print_r($data);Cost and limits
This operation needs no API key and costs nothing: called without a key it answers 200 and deducts zero tokens, up to 10 requests a minute per IP address.
Rate limits per minute
| No key | 10 |
| Free | 60 |
| Pro | 300 |
| Enterprise | 1200 |
Questions
What does Convert text and code identifiers across 14 string casing conventions… cost?
This operation needs no API key and costs nothing: called without a key it answers 200 and deducts zero tokens, up to 10 requests a minute per IP address.
How do I authenticate?
Send your key in the x-api-key header. One key covers every metered endpoint; there is nothing to enable per endpoint.
Can I send an Authorization: Bearer token instead?
Not for a metered endpoint — those take the x-api-key header and nothing else. Bearer tokens belong to the account side: the dashboard and account APIs accept a JWT session, and castomapi-auth issues those through a standard OAuth2 handshake, with authorization code, client credentials and refresh grants. The auth service page covers it.
What are the limits?
10 requests a minute per IP with no key at all, 60 a minute on the free tier, 300 on Pro, 1200 on Enterprise. Above the no-key tier the quota is per account, across every endpoint.
OpenAPI: https://app.castomapi.com/docs/json