Real Fake Data

A Model Context Protocol server for Real Fake Data — gives an AI assistant (Claude Desktop, Claude Code, Cursor, …) realistic, synthetic test data on demand: valid PESELs (correct checksums), NIPs, REGONs, IBANs, addresses drawn from real cities and streets, people, and company names across 27 EU countries.

Output looks real but is fake — safe for staging, demos, and seed data.

• Two tools, self-updating. list_generators for discovery, generate to run any generator by id. New generators on the API appear automatically — no client upgrade.
• Thin and stateless. Calls the hosted Real Fake Data API over HTTPS; no data is generated or stored locally.
• Seeded when you want it. Pass a seed for reproducible output, or omit it to randomise each call.

Install

No global install needed — point your MCP client at the package via npx. It runs over stdio, so the client spawns it as a subprocess.

Claude Desktop / Claude Code

Add it to your MCP servers config (claude_desktop_config.json, or via claude mcp add):

{
  "mcpServers": {
    "real-fake-data": {
      "command": "npx",
      "args": ["-y", "@przeslijmi/real-fake-data-mcp"],
      "env": {
        "REAL_FAKE_DATA_API_KEY": "your-api-key"
      }
    }
  }
}

Restart the client; the real-fake-data tools become available in any conversation.

Requires Node 22+.

Configuration

The client passes configuration through the server's env:

Variable	Required	Description
REAL_FAKE_DATA_API_KEY	No	API key sent as Authorization: Bearer <key>, lifting requests onto your metered plan. Omit to use the anonymous lane.
REAL_FAKE_DATA_API_BASE_URL	No	Override the hosted API. Defaults to https://api.real-fake-data.com; point it at a local API during development.

Tools

list_generators

Lists every available generator with its id, description, and supportedLocales. Call it first to discover which ids generate accepts.

You: What fake-data generators are available?

Claude (calls list_generators) → pl.pesel, pl.company, pl.address, any.email, de.company-name, …

generate

Runs one generator and returns the API's { data, meta } envelope.

Argument	Type	Description
generator	string (required)	Generator id from list_generators, e.g. pl.pesel or any.email.
options	Record<string, string | number | boolean>	Generator-specific query parameters; omit for defaults.
count	number	Number of records to generate; omit for a single record. (Upper bound enforced by your plan.)
seed	number	Seed for reproducible output; omit to randomise each call.

You: Generate 3 female Polish people for my staging DB.

Claude (calls generate with { generator: "pl.person", count: 3, options: { sex: "f" } }) → three records of { name, surname, initials, birthDate, pesel }.

options are the same query parameters the generator exposes on the REST API — list_generators describes each, and the API docs list them in full. Examples: { "format": "digits-only" } for a NIP, { "teryt": "14" } to anchor an address to a region, { "invalid": true } to get a deliberately-wrong checksum for testing your validators.

How it relates to the REST API

This server is a thin MCP front end over the same hosted endpoints the Playwright addon and REST API serve. A generator id maps directly to a route — pl.pesel → GET /v1/pl/pesel, any.email → GET /v1/email — and metering, plan limits, and validation all behave identically. Use this package when you want an AI assistant to produce test data conversationally; use the Playwright addon or the REST API directly from code.

License

MIT

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This repository is auto-generated from a private upstream monorepo. Open issues here, but code changes are made upstream and re-synced — pull requests against this repo are applied upstream, not merged directly.