Security

CSV/JSON Data Watermarker

Inject visible or signature-style watermark fields into CSV or JSON exports so shared datasets can be traced later

file· File resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/csv-json-data-watermarker' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"dataFile.ext","contentType":"application/octet-stream","size":12345}'

# 2) PUT the file bytes directly to the presigned uploadUrl
curl -X PUT '<presigned uploadUrl>' \
  --data-binary @/path/to/file.ext

# 3) Call the tool, passing the returned storageKey for each file field
curl -X POST 'https://api.elysiatools.com/en/api/tools/csv-json-data-watermarker' \
  -F 'dataInput=id,email,plan
1,[email protected],pro
2,[email protected],basic' \
  -F 'dataFile=' \
  -F 'inputFormat=csv' \
  -F 'watermarkMode=visible' \
  -F 'username=partner-share-001' \
  -F 'customField=sales-demo' \
  -F 'secretSalt=elysia-watermark'

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/csv-json-data-watermarker

Parameters

Name	Type	Required	Description
dataInput	textarea	No	—
dataFile	fileupload required	No	—
inputFormat	select	No	—
watermarkMode	select	No	—
username	text	Yes	—
customField	text	No	—
secretSalt	text	No	—

File-type parameters must be uploaded first via POST /upload/csv-json-data-watermarker, then the returned filePath is passed to the corresponding file field.

Response format

File result

JSON

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}

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-csv-json-data-watermarker": {
      "name": "csv-json-data-watermarker",
      "description": "Inject visible or signature-style watermark fields into CSV or JSON exports so shared datasets can be traced later",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=csv-json-data-watermarker",
      "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": "csv-json-data-watermarker",
    "arguments": {
  "dataInput": "id,email,plan\n1,[email protected],pro\n2,[email protected],basic",
  "dataFile": "",
  "inputFormat": "csv",
  "watermarkMode": "visible",
  "username": "partner-share-001",
  "customField": "sales-demo",
  "secretSalt": "elysia-watermark"
}
  }
}

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).

File parameters accept a public file URL only (https://…). Local paths, data: URIs, and Base64 strings are not supported.

Questions or issues? Contact [email protected]