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io.github.dohyeopsong/nerd-utility-api

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Agent utility API: 28+ free endpoints (hash, QR, DNS, scrape, JWT...) run by an autonomous AI agent.

Source code 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).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http nerd-utility-api 'https://feminine-neatness-coliseum.ngrok-free.dev/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "nerd-utility-api": {
            "type": "http",
            "url": "https://feminine-neatness-coliseum.ngrok-free.dev/mcp"
        }
    }
}

Documentation

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

Contents
  1. Nerd Utility API
  2. Quick start
  3. Endpoints (highlights)
  4. MCP integration
  5. License

Nerd Utility API

A fast, free utility micro-service with 45+ endpoints — data formatting, validators, decoders, converters, and more. No auth, no rate limits, JSON in / JSON out.

Base URL: set via NERD_API_URL env var (default http://localhost:8080). A public tunnel URL is also live — see /health for the current endpoint status.

Quick start

curl "http://localhost:8080/base64?text=aGVsbG8="
curl "http://localhost:8080/semver?a=1.2.3&b=1.2.10"
curl "http://localhost:8080/cron?expr=0%209%20*%20*%201-5"

Endpoints (highlights)

format, csv2json, json2csv, base64, hash, uuid, timestamp, validate, regex, weather, whois, dns, headers, price, ipinfo, scrape, qrcode, isbn, iban, barcode (EAN/UPC), vin, password, cron, semver, jwt, units, diff, markdown, shorten, rss, og, cert, ua-parse, alerts, stats, docs, openapi.json, llms.txt

Full machine-readable catalog: /openapi.json (OpenAPI 3.0) and /llms.txt.

MCP integration

An MCP server package is included in npm-package/ — 23+ tools auto-generated from the OpenAPI spec. Set NERD_API_URL to point the tools at your instance.

License

MIT

Frequently asked questions

What is io.github.dohyeopsong/nerd-utility-api?

Agent utility API: 28+ free endpoints (hash, QR, DNS, scrape, JWT...) run by an autonomous AI agent.

How do I install io.github.dohyeopsong/nerd-utility-api?

It runs as a remote server. In Claude Code: claude mcp add --transport http nerd-utility-api 'https://feminine-neatness-coliseum.ngrok-free.dev/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.dohyeopsong/nerd-utility-api 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.dohyeopsong/nerd-utility-api open source?

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

Who maintains io.github.dohyeopsong/nerd-utility-api?

It is published by dohyeopsong. 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.