Snake Case Converter

Open Snake Case Converter on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "snake-case",
  "category": "text-tools",
  "built": true,
  "requirements": "Underscore identifiers; recognize mixed-case boundaries and acronym groups.",
  "implementation": {
    "fields": [],
    "experience": {
      "automatic": true,
      "single": false,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "Your text",
      "placeholder": "Hello world!",
      "help": "Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.",
      "helpParts": [
        "Change the input or settings to update your result.",
        "Results update as you type.",
        "Up to 1,000,000 characters."
      ],
      "action": null
    },
    "mode": "automatic",
    "interactive": false
  },
  "execution": "POST /api/v1/tools/snake-case/run",
  "api": {
    "id": "snake-case",
    "name": "Snake case",
    "category": "text-tools",
    "description": "Join lowercase words_with_underscores.",
    "notes": "",
    "human_path": "/en/text-tools/snake-case/",
    "method": "POST",
    "endpoint": "/api/v1/tools/snake-case/run",
    "schema_url": "/api/v1/tools/snake-case",
    "input_schema": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "input": {
          "type": "string",
          "maxLength": 1000000,
          "default": "",
          "description": "Plain text input. File tools use files instead unless otherwise documented."
        },
        "options": {
          "type": "object",
          "additionalProperties": false,
          "properties": {}
        }
      }
    },
    "output_schema": {
      "type": "object",
      "required": [
        "tool",
        "result"
      ],
      "properties": {
        "tool": {
          "type": "string"
        },
        "result": {
          "type": "object",
          "required": [
            "text",
            "files"
          ],
          "properties": {
            "text": {
              "type": [
                "string",
                "null"
              ]
            },
            "data": {
              "description": "Parsed JSON when the textual result is JSON."
            },
            "name": {
              "type": "string"
            },
            "mime": {
              "type": "string"
            },
            "files": {
              "type": "array",
              "items": {
                "type": "object",
                "required": [
                  "name",
                  "mime",
                  "bytes",
                  "base64"
                ],
                "properties": {
                  "name": {
                    "type": "string"
                  },
                  "mime": {
                    "type": "string"
                  },
                  "bytes": {
                    "type": "integer"
                  },
                  "base64": {
                    "type": "string",
                    "contentEncoding": "base64"
                  }
                }
              }
            }
          }
        }
      }
    },
    "processing": "Server; same transformation code as browser tools",
    "limits": {
      "request_bytes": 8388608,
      "input_characters": 1000000,
      "files_bytes": 5242880,
      "max_files": 0,
      "timeout_seconds": 12
    }
  },
  "agent_processing": "Server; same transformation code as browser tools",
  "browser_agent": {
    "supported": true,
    "name": "transform_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

Page guide

Join lowercase words_with_underscores.

Runs on your device

How to use Snake case

Enter your text in the input field.
The result updates as you type. Adjust the available settings if needed.
Review the result, then use Copy result or a download link when available.

How to use this tool

Paste your text, choose a case and copy the result. The original input stays in place so you can try another format.

Letter case and identifiers

Letter case uses English locale rules. Identifier modes split spaces, punctuation and existing case boundaries, then join the words. Accented letters are preserved; punctuation is removed.

What to expect

Join lowercase words_with_underscores. Spaces and punctuation become word boundaries, then words are joined with underscores. Existing camelCase boundaries are recognized. The result is not checked against a programming-language identifier rule.

Try a small example

Hello world