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io.github.Bishop81/csvto-mcp

Official registry Data and databases

Local CSV, JSON and Excel conversion. Files are never uploaded and never enter the context.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package csvto-mcp
Claude Code 
claude mcp add csvto-mcp -- npx -y csvto-mcp@0.1.2
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "csvto-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "csvto-mcp@0.1.2"
            ]
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. csvto
  2. Install the MCP server
  3. Types are inferred per column, not per cell
  4. Develop
  5. Licence

csvto

CSV, JSON and Excel conversion that runs where your data already is.

  • csvto-mcp — an MCP server. Point your AI assistant at a file path; it converts locally and writes the result beside it. Nothing is uploaded, and file contents never pass through the model's context.
  • @csvto/core — the conversion engine. No DOM, no fs, no network, so the same tested code runs in a browser, in a local MCP process, or on a server.

The same engine powers the browser tools at csvtosite.com, where conversion happens client-side and files are likewise never uploaded.

Install the MCP server

claude mcp add csvto -- npx -y csvto-mcp

Or in any MCP client's config:

{
  "mcpServers": {
    "csvto": { "command": "npx", "args": ["-y", "csvto-mcp"] }
  }
}

Requires Node 18+. Full tool list and behaviour: packages/mcp/README.md.

Types are inferred per column, not per cell

This is the part that matters, and where most converters quietly corrupt data. A column converts to numbers only if every value in it survives the round trip exactly. If one value would change, the whole column stays text:

  • 01234 keeps its leading zero instead of becoming 1234
  • A 16-digit account number stays itself instead of becoming 1.23457E+14
  • 1250.50 keeps its trailing zero instead of becoming 1250.5
  • A column never ends up as a mix of numbers and strings

Verified in tests: 01234 survives a CSV → xlsx → CSV round trip intact.

Develop

npm install
npm test          # 49 tests
npm run build

packages/core must stay environment-free — no window, no fs, no fetch. That constraint is what lets one tested engine serve every surface.

Licence

MIT

Frequently asked questions

What is io.github.Bishop81/csvto-mcp?

Local CSV, JSON and Excel conversion. Files are never uploaded and never enter the context.

How do I install io.github.Bishop81/csvto-mcp?

It runs on your machine. In Claude Code: claude mcp add csvto-mcp -- npx -y csvto-mcp@0.1.2. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.Bishop81/csvto-mcp need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is io.github.Bishop81/csvto-mcp open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains io.github.Bishop81/csvto-mcp?

It is published by Bishop81. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.