Data Processing

JSON Key Extractor

Extract all keys from JSON objects with multiple output formats. Perfect for analyzing JSON structure, documentation generation, and understanding complex nested objects.

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Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/json-key-extractor' \
  -H 'Content-Type: application/json' \
  -d '{"jsonInput":"Enter your JSON data...","outputFormat":"list","flattenKeys":true,"includeTypes":true,"includePath":false,"sortBy":"alphabetical","removeDuplicates":false,"maxDepth":10}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/json-key-extractor

Parameters

Name	Type	Required	Description
jsonInput	textarea	Yes	—
outputFormat	select	Yes	—
flattenKeys	checkbox	No	Convert nested keys to dot notation (e.g., "user.profile.name")
includeTypes	checkbox	No	Include the data type of each key (string, number, boolean, object, array, null)
includePath	checkbox	No

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-json-key-extractor": {
      "name": "json-key-extractor",
      "description": "Extract all keys from JSON objects with multiple output formats. Perfect for analyzing JSON structure, documentation generation, and understanding complex nested objects.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=json-key-extractor",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "json-key-extractor",
    "arguments": {
  "jsonInput": "Enter your JSON data...",
  "outputFormat": "list",
  "flattenKeys": true,
  "includeTypes": true,
  "includePath": false,
  "sortBy": "alphabetical",
  "removeDuplicates": false,
  "maxDepth": 10
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

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