JsonFabrica runs on your own machine — the client starts it, so there is no endpoint to ping. 71 installs a week from npm. Last commit 6 Oct 2026.
Generate realistic, relational synthetic JSON test data from templates, via the JsonFabrica API.
Nothing serious here today
Today is the operative word: we check JsonFabrica every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add jsonfabrica-mcp-server -e 'JSONFABRICA_API_KEY=<JSONFABRICA_API_KEY>' -- npx -y @jsonfabrica/mcp-server{
"mcpServers": {
"jsonfabrica-mcp-server": {
"command": "npx",
"args": [
"-y",
"@jsonfabrica/mcp-server"
],
"env": {
"JSONFABRICA_API_KEY": "<JSONFABRICA_API_KEY>"
}
}
}
}[mcp_servers.jsonfabrica-mcp-server]
command = "npx"
args = ["-y", "@jsonfabrica/mcp-server"]
env = { JSONFABRICA_API_KEY = "<JSONFABRICA_API_KEY>" }{
"mcpServers": {
"jsonfabrica-mcp-server": {
"command": "npx",
"args": [
"-y",
"@jsonfabrica/mcp-server"
],
"env": {
"JSONFABRICA_API_KEY": "<JSONFABRICA_API_KEY>"
}
}
}
}{
"servers": {
"jsonfabrica-mcp-server": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@jsonfabrica/mcp-server"
],
"env": {
"JSONFABRICA_API_KEY": "<JSONFABRICA_API_KEY>"
}
}
}
}Put your own value in place of
<JSONFABRICA_API_KEY> (JsonFabrica API key. Create one at jsonfabrica.com -> Settings -> API Keys).
The author’s registry entry marks it as required.
Optional settings from the registry entry, left out of the block above:
JSONFABRICA_API_URL (Base URL of the JsonFabrica gateway. Override only when self-hosting the gateway).
Alternatives to JsonFabrica
same job, measured the same wayGenerate realistic, FK-consistent synthetic test data for your databases from your AI assistant.
Generate synthetic random user data for testing, demos, and development without using real persona.
Generates relationally valid test data in a PostgreSQL database from its live schema.
3rd Generation Testing (3TG) — generate deterministic test suites from Markdown spec tables via MCP.
32 free MCP tools for data validation, text optimization, and synthetic test data.
Realistic synthetic test data — valid PESELs, NIPs, IBANs, addresses, people across 27 EU countries.
Schema-aware relational test data generator with working foreign keys, for any MCP client.
Fake, mock and test data generator: CSV, JSON, SQL from a .tdc config, made locally by TDCv2.
JsonFabrica — questions
Answers built from our own checks of this server.