Simple Data Comparator MCP

Simple toolset for performing comparison of JSON, XML, XLSX, CSV and text data in Actual-Expected format with different options.

Agent-oriented reference for thesimple-data-comparator-mcpMCP server. Each comparator compares anactualvalue against anexpected templateand returns pass/fail with structured difference lines on failure.

All tools return MCP content with this structure:

{ "content": [{ "type": "text", "text": "<result message>" }], "isError": true | false }

- Pass:isError: false, text isValidation passed.
- Fail:isError: true, text includesValidation failed.and difference lines (except text comparator, which does not expose diff details via MCP)
- Choose the toolthat matches the data format you need to compare.
- Prepare inputs— JSON/XML/CSV/text as strings; XLSX asworkspace file paths(e.g.Templates/test/1.xlsx) or base64.
- Call the MCP tool— for Excel usecompare-xlsxwithactualandtemplatefile paths.
- ReadisError— iftrue, parse the difference lines to explain what diverged.
- Apply optionswhen needed (e.g.strictModefor JSON,includeColumnsfor CSV,ignoreRowOrderfor unordered row sets).

Use MCP tool discovery (tools/list) to get live schemas. Tool names are stable:validate-json,validate-xml,validate-csv,validate-xlsx,validate-text.

The server communicates over stdin/stdout. Logs are written to stderr so they do not interfere with MCP protocol messages.

Add this to your Cursor MCP settings (.cursor/mcp.json):

{ "mcpServers": { "simple-data-comparator-mcp": { "type": "stdio", "command": "npx", "args": [ "-y", "@ee_will_i/simple-data-comparator-mcp" ] } } }

Replace the path with your local project path. Runnpm run buildbefore starting the server.

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