Json
FreeNot checkedProvides tools to validate, format, and query JSON strings via MCP. Enables AI agents to work with JSON data without needing keys or internet.
About
Provides tools to validate, format, and query JSON strings via MCP. Enables AI agents to work with JSON data without needing keys or internet.
README
JSON tools MCP.
Part of Pipeworx — an MCP gateway connecting AI agents to 1394+ live data sources.
Tools
| Tool | Description |
|---|---|
validate_json |
Validate a JSON string (keyless, offline). Returns whether it is valid and, if not, the error message and the character position. |
format_json |
Pretty-print or minify a JSON string. indent sets spaces (default 2); pass 0 to minify to a single line. Keyless, offline. |
query_json |
Extract a value from JSON at a path using dot/bracket notation, e.g. "user.addresses[0].city". Keyless, offline. |
Quick Start
Add to your MCP client (Claude Desktop, Cursor, Windsurf, etc.):
{
"mcpServers": {
"json": {
"url": "https://gateway.pipeworx.io/json/mcp"
}
}
}
Or connect to the full Pipeworx gateway for access to all 1394+ data sources:
{
"mcpServers": {
"pipeworx": {
"url": "https://gateway.pipeworx.io/mcp"
}
}
}
Using with ask_pipeworx
Instead of calling tools directly, you can ask questions in plain English:
ask_pipeworx({ question: "your question about Json data" })
The gateway picks the right tool and fills the arguments automatically.
More
License
MIT
Installing Json
This server has no published package — it is built from source. Open the repository and follow its README.
▸ github.com/pipeworx-io/mcp-jsonFAQ
Is Json MCP free?
Yes, Json MCP is free — one-click install via Unyly at no cost.
Does Json need an API key?
No, Json runs without API keys or environment variables.
Is Json hosted or self-hosted?
A hosted option is available: Unyly runs the server in the cloud, no local setup required.
How do I install Json in Claude Desktop, Claude Code or Cursor?
Open Json on unyly.org, pick your client tab (Claude Desktop, Claude Code, Cursor) and press Install — the config is generated automatically, no JSON editing.
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