Server data from the Official MCP Registry
Local CSV, JSON and Excel conversion. Files are never uploaded and never enter the context.
About
Local CSV, JSON and Excel conversion. Files are never uploaded and never enter the context.
Security Report
This MCP server is well-designed with strong security fundamentals. It performs local file conversions without uploading data, has no authentication requirements (appropriate for local-only operation), and avoids dangerous patterns like arbitrary code execution or credential handling. Input validation via Zod schemas is thorough, and file operations are properly scoped. Minor code quality observations include broad exception handling and lack of explicit error logging, but these do not introduce security vulnerabilities. Supply chain analysis found 6 known vulnerabilities in dependencies (2 critical, 3 high severity). Package verification found 1 issue (1 critical, 0 high severity).
8 files analyzed · 11 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
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Unverified package source
We couldn't verify that the installable package matches the reviewed source code. Proceed with caution.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-bishop81-csvto-mcp": {
"args": [
"-y",
"csvto"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
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, nofs, 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:
01234keeps its leading zero instead of becoming1234- A 16-digit account number stays itself instead of becoming
1.23457E+14 1250.50keeps its trailing zero instead of becoming1250.5- 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
Reviews
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