GraphJin

Connect Your Databases to AI

Auto-learns your schema. Compiles GraphQL into optimized SQL. Works as an MCP server for any AI assistant.

8+ DatabasesZero Resolver CodeSingle SQL QueryMCP Server

npx graphjin serve

Get Started GitHub

Works With Your Databases

PostgreSQL

MySQL

MariaDB

MongoDB

SQLite

SQL Server

Oracle

CockroachDB

AWS Aurora

Google Cloud SQL

YugabyteDB

LLMs struggle with databases, diverse SQL dialects, custom query methods like MongoDB, complex joins.

GraphJin is a compiler that auto-learns your entire schema and generates efficient queries from simple GraphQL.

Even smaller models can describe exactly what data they need, and GraphJin handles the rest. Nothing like this exists for AI, works with Claude Desktop or any MCP client.

AI-Powered Database Queries

Ask questions in plain English. GraphJin + Claude Desktop handles the rest.

Claude Desktop

who's the top customer?

execute_graphql

{ customers { id full_name email purchases { quantity product { price } } } }

Done

Based on the purchase data, here are the top customers ranked by total spend:

Rank	Customer	Email	Orders	Items	Total Spent
🥇	Antwan Friesen	francohirthe@medhurst.com	20	124	$928.45
🥈	Lon Cruickshank	margaretbailey@ruecker.info	20	94	$586.50
🥉	Susana Schaefer	jewelpowlowski@osinski.biz	20	91	$580.72

Antwan Friesen is the top customer with almost $1,000 in purchases — about 60% more than the runner-up.

Try It Yourself

Simple & Powerful

Write GraphQL, get optimized SQL. Queries, mutations, subscriptions, and aggregations — all in one query.

query.graphql

query {
  products(limit: 10, order_by: { price: desc }) {
    id
    name
    price
    owner {
      full_name
      email
    }
  }
}

result.json18ms

{
  "products": [
    {
      "id": 104,
      "name": "Mechanical Keyboard",
      "price": 149.99,
      "owner": {
        "full_name": "Alice Dev",
        "email": "alice@example.com"
      }
    }
  ]
}

Why GraphJin?

Built for the AI era. No resolvers, no ORMs, no N+1 problems.

SQL Query for Any Complexity

Databases, Same GraphQL

Lines of Resolver Code

MCP

Works with Any AI

Production Security

RBAC, JWT auth, row-level security, query allow-lists

Auto Discovery

Introspects tables, columns, relationships automatically

Live Subscriptions

Real-time data with cursor-based pagination

50+ Features

Remote API Joins

Recursive Queries

JS Workflows

Chain queries, transform data, add business logic — things a single GraphQL call can't do. Invoke from MCP or REST.

workflows/customer_report.js

workflow.js

function main(input) {
  const top = gj.tools.executeGraphQL({
    query: `{
      customers(
        limit: 3,
        order_by: {total_spend: desc}
      ) {
        id full_name total_spend
      }
    }`
  });

  return top.map(c => ({
    name: c.full_name,
    spend: "$" + c.total_spend,
    tier: c.total_spend > 500
      ? "VIP" : "Standard"
  }));
}

result.json 24ms

[
  {
    "name": "Antwan Friesen",
    "spend": "$928.45",
    "tier": "VIP"
  },
  {
    "name": "Lon Cruickshank",
    "spend": "$586.50",
    "tier": "VIP"
  },
  {
    "name": "Susana Schaefer",
    "spend": "$580.72",
    "tier": "VIP"
  }
]

curl localhost:8080/api/v1/workflows/customer_report

Quick Start

$npx graphjin serve

Use with Node.js projects

MCP Client Setup

Copy and run one command

Global-scoped non-interactive install for Claude Code (default server: http://localhost:8080/)

graphjin mcp install --client claude --scope global --yes

Global-scoped non-interactive install for OpenAI Codex (default server: http://localhost:8080/)

graphjin mcp install --client codex --scope global --yes

Prefer interactive setup? Run: graphjin mcp install

Works on macOS, Windows, and Linux. Supports PostgreSQL, MySQL, SQLite, MongoDB, and more.

Get Started

From zero to queries in minutes.

Point to Your Database

Configure your connection — PostgreSQL, MySQL, SQLite, and more.

Auto-Discover Schema

GraphJin introspects tables, columns, and relationships automatically.

Start Querying