json-tools-mcp
Advanced tools
Validate, format, and inspect JSON on the local machine. No network, no key, nothing is sent anywhere.
This file is self contained. It reads public data only and never writes to the machine. All output is bounded and honest about what could not be fetched.
validate_json Check JSON validity.format_json Pretty print JSON.json_info Return top level type and key count.npm install
npm run build
node dist/index.js
All processing happens locally. The server never sends your JSON anywhere.
These tools need a license key:
find_schemaBuy a key at https://mcp-marketplace.io/server/io-github-mrfentmen-json-tools-mcp and set it in your MCP client config:
"env": { "MCP_LICENSE_KEY": "mcp_live_..." }
The key is checked against MCP Marketplace, cached for 24 hours, and keeps working offline once one check has succeeded. Every other tool on this server stays free.
FAQs
Validate, format, and inspect JSON locally. No network and no key.
We found that json-tools-mcp demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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