Data Processing

JSON Flattener

Flatten nested JSON objects into key-value pairs with customizable delimiters and flattening strategies

json· JSON resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/json-flattener' \
  -H 'Content-Type: application/json' \
  -d '{"jsonInput":"{\n  \"user\": {\n    \"name\": \"John\",\n    \"details\": {\n      \"age\": 30,\n      \"city\": \"New York\"\n    }\n  },\n  \"settings\": {\n    \"theme\": \"dark\",\n    \"notifications\": true\n  }\n}","strategy":"nested","delimiter":".","maxDepth":0,"includeArrays":true,"filterNulls":false,"preserveOrder":true,"sortKeys":"none"}'

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-flattener

Parameters

Name	Type	Required	Description
jsonInput	textarea	Yes	—
strategy	select	Yes	—
delimiter	text	No	—
maxDepth	number	No	—
includeArrays	checkbox	No	—
filterNulls

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-flattener": {
      "name": "json-flattener",
      "description": "Flatten nested JSON objects into key-value pairs with customizable delimiters and flattening strategies",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=json-flattener",
      "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-flattener",
    "arguments": {
  "jsonInput": "{\n  \"user\": {\n    \"name\": \"John\",\n    \"details\": {\n      \"age\": 30,\n      \"city\": \"New York\"\n    }\n  },\n  \"settings\": {\n    \"theme\": \"dark\",\n    \"notifications\": true\n  }\n}",
  "strategy": "nested",
  "delimiter": ".",
  "maxDepth": 0,
  "includeArrays": true,
  "filterNulls": false,
  "preserveOrder": true,
  "sortKeys": "none"
}
  }
}

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).

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