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json5-mcp

json5-mcp

Local
github.com/MukundaKattaDeveloper Tools0Updated 20w ago
Repository

About json5-mcp

json5-mcp is an MCP server for parsing JSON5 and converting it to strict JSON, useful for configuration files and model-generated JSON-like text. It also serializes values back to JSON5 for human-edited configuration.

Key features

  1. 01Parse JSON5 into values
  2. 02Serialize values as JSON5
  3. 03Convert JSON5 text to strict JSON
  4. 04Support comments, trailing commas, and unquoted keys

Use cases

  1. 01Parse commented configuration files
  2. 02Convert model-generated JSON5 to strict JSON
  3. 03Format values for human-edited configuration

MCP support

It exposes `parse_json5`, `to_json5`, and `to_strict_json` tools to MCP clients for parsing and serializing JSON5 and strict JSON.

Configuration

Local server config is the same for every client. Copy it into your client’s MCP config file.

mcp.json · Universal config
{
  "mcpServers": {
    "mukundakatta-json5": {
      "command": "npx",
      "args": [
        "-y",
        "@mukundakatta/json5-mcp"
      ]
    }
  }
}
Run commandnpx -y @mukundakatta/json5-mcp

Local servers need a runtime on your machine (e.g. Node.js 18+). Config file locations differ by client; see your client’s docs.

Packages
npm@mukundakatta/json5-mcp0.1.0

Tools

3

Saved tool list · updated 3w ago

ParameterTypeRequiredDescription
textstringYes

Details

From the project README

@mukundakatta/json5-mcp

MCP server for JSON5: parse JSON-with-comments, trailing commas, unquoted keys, hex / NaN / Infinity. Round-trip to strict JSON when downstream tools require it.

Tools

  • parse_json5(text) — loose parse to a real value
  • to_json5(value, indent?) — serialize for human-edited config
  • to_strict_json(text, indent?) — JSON5 in, strict JSON out

Why this exists

LLMs frequently emit JSON-with-comments thinking it's JSON. They also see config files (tsconfig, .babelrc, mcp.json) that are JSON5 in disguise. This server is the loose-parse + strict-emit round trip — feed it whatever the LLM produced, get back something JSON.parse accepts.

Install — Claude Desktop

{
  "mcpServers": {
    "json5": { "command": "npx", "args": ["-y", "@mukundakatta/json5-mcp"] }
  }
}

Same shape for Cursor / Cline / Windsurf / Zed.

License

MIT OR Apache-2.0.

Comments

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