snake_case Converter API: Complete Developer Guide

Need to convert text to snake_case format? This guide covers everything about snake_case conversion via API, including when to use snake_case, naming conventions, and implementation examples in multiple programming languages.

What is snake_case?

snake_case is a naming convention where words are separated by underscores and all letters are lowercase. It's called snake_case because the underscores look like a snake on the ground connecting the words.

Example: Hello World Example becomes hello_world_example

When to Use snake_case

snake_case is commonly used in:

Python

Functions, variables, and module names follow snake_case convention (PEP 8).

Ruby

Methods and variables use snake_case by convention.

Databases

Table names and column names often use snake_case.

Using the snake_case Converter API

TinyFn provides a simple endpoint to convert text to snake_case:

POST https://api.tinyfn.io/v1/text/snakecase
Headers: X-API-Key: your-api-key
Content-Type: application/json

{
  "text": "Hello World Example"
}

{
  "snake_case": "hello_world_example",
  "original": "Hello World Example"
}

Parameters

Code Examples

JavaScript / Node.js

const response = await fetch(
  'https://api.tinyfn.io/v1/text/snakecase',
  {
    method: 'POST',
    headers: {
      'X-API-Key': 'your-api-key',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({ text: 'userFirstName' })
  }
);
const result = await response.json();
console.log(result.snake_case); // user_first_name

Python

import requests

response = requests.post(
    'https://api.tinyfn.io/v1/text/snakecase',
    headers={'X-API-Key': 'your-api-key'},
    json={'text': 'userFirstName'}
)
result = response.json()['snake_case']
print(result)  # user_first_name

cURL

curl -X POST "https://api.tinyfn.io/v1/text/snakecase" \
  -H "X-API-Key: your-api-key" \
  -H "Content-Type: application/json" \
  -d '{"text": "userFirstName"}'

Common Use Cases

• Database Columns: Convert API field names to database column names
• Python Code: Generate Python-compliant variable names
• File Names: Create consistent file naming conventions
• API Normalization: Convert between different API naming conventions
• ORM Mapping: Map camelCase model fields to snake_case columns

Best Practices

1. Consistency: Use snake_case throughout your Python/Ruby codebase
2. All lowercase: snake_case should always be lowercase (except SCREAMING)
3. No double underscores: Avoid multiple consecutive underscores
4. Start with letter: Don't start names with numbers or underscores

Use via MCP

Your AI agent can call this tool directly via Model Context Protocol — no HTTP code needed. Add TinyFn to Claude Desktop, Cursor, or any MCP client:

{
  "mcpServers": {
    "tinyfn-text": {
      "url": "https://api.tinyfn.io/mcp/text/",
      "headers": {
        "X-API-Key": "your-api-key"
      }
    }
  }
}

See all text analysis tools available via MCP in our Text Analysis MCP Tools for AI Agents guide.