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-extractorParameters
| 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]