Koskamo

json-mender-mcp

A local-first Model Context Protocol server designed to repair malformed JSON output from Large Language Models, validate data against JSON Schemas, and test regex patterns. It operates deterministically without requiring API keys or network calls, ensuring data privacy by running entirely on the user's machine using established npm packages like jsonrepair and ajv.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

json-mender-mcp logo, by headlessherm-creatorCommunity listingLocal stdioSource reviewed; not executedPublished by headlessherm-creator
You need:Install Node.js (v18+)Clone and install: git clone https://github.com/headlessherm-creator/json-mender-mcp.git cd json-mender-mcp npm install
Vendor documentation

What you can do with it

  • Fix malformed JSON output from LLMs such as trailing commas or unquoted keys
  • Validate JSON data against a defined JSON Schema for precise error reporting
  • Test regex patterns against strings to ensure correct matching behavior

Source and maintenance

Community listingRegistry 0.2.1MIT
mcp-registry: io.github.headlessherm-creator/json-mender-mcp@0.2.1Source repository
Last repository push
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

json-mender-mcp 0.2.1

npm
json-mender-mcp package definition
{
  "version": "0.2.1",
  "transport": "stdio",
  "identifier": "json-mender-mcp",
  "registryType": "npm",
  "registryBaseUrl": "https://registry.npmjs.org"
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · repository · passed · metadata changed · updated
  • · backfill · recorded · Pre-expansion baseline; unobserved rich metadata remains unknown

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "json-mender-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "json-mender-mcp@0.2.1"
      ]
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "json-mender-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "json-mender-mcp@0.2.1"
      ]
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "json-mender-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "json-mender-mcp@0.2.1"
      ]
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "json-mender-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "json-mender-mcp@0.2.1"
      ]
    }
  }
}

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