unified-sql-client

unified-sql-client is a universal SQL and data-fetching library for Node.js and React applications. It supports MySQL, MariaDB, PostgreSQL, and Neon serverless, making it suitable for both traditional and serverless environments. It also includes a built-in fetcher React hook for easy data fetching from REST APIs.

📦 Installation

npm install unified-sql-client

🌐 Environment Setup

Make sure your .env file is configured correctly to support dynamic environment-based connections.

✅ For PostgreSQL / Neon:

DATABASE_URL=postgres://user:password@hostname:port/database
USE_NEON_DRIVER=true

The USE_NEON_DRIVER flag can also be automatically detected if your URL includes .neon.tech.

✅ For MySQL / MariaDB:

# Production
DB_HOST=your-production-host
DB_USER=your-production-user
DB_PASSWORD=your-production-password
DB_NAME=your-production-db

# Development (fallback)
DEV_DB_HOST=localhost
DEV_DB_USER=root
DEV_DB_PASSWORD=
DEV_DB_NAME=local_db

The driver is auto-configured depending on NODE_ENV.

🚀 Usage

1. Backend SQL Queries (useDb)

queryEx – safe result + error return:

import { useEnvConnection, queryEx } from "unified-sql-client/server";

useEnvConnection("pg"); // Or MySQL

const [result, error] = await queryEx("SELECT * FROM users WHERE id = $1", [1]);

if (error) {
  console.error("DB Error:", error);
} else {
  console.log("Data:", result);
}

query – direct result:

import { query } from "unified-sql-client/server";

const users = await query("SELECT * FROM users");
console.log(users);

2. Frontend React Hook (fetcher)

import { useFetcher, HttpMethod } from "unified-sql-client/fetcher";

const { data, error, isLoading } = useFetcher({
  method: HttpMethod.GET,
  url: "/api/posts",
});

For mutations (POST/PUT/DELETE):

const { trigger } = useFetcher({
  method: HttpMethod.POST,
  url: "/api/post",
  payload: { title: "Hello", content: "World" },
});

await trigger();

⚙️ Configuration Options

You can also manually set a custom connection:

import { setConnection } from "unified-sql-client/server";

setConnection({
  host: "localhost",
  user: "admin",
  password: "secret",
  database: "mydb",
  driver: "pg",
});

✅ Features

• 🔄 Dynamic .env config based on environment
• 🧩 MySQL / MariaDB / PostgreSQL / Neon support
• 🚀 Type-safe wrapper with queryEx<T>()
• 🔗 React useFetcher hook for API fetches
• 🔒 Safe error handling for SQL operations
• ⚡ Works in serverless environments like Vercel

📘 API Reference

server (server-side)

• query(query: string, args: any[]): Promise<any>
• queryEx<T>(query: string, args: any[]): Promise<[T | null, DbError | null]>
• useEnvConnection(driver?: "mysql" | "pg")
• setConnection(config: DbConnectionConfig)
• beginTransaction(), commit(), rollback() (MySQL only)

fetcher (client-side)

• useFetcher<T>(options: { method, url, payload? })

  • GET: returns { data, error, isLoading }
  • POST/PUT/DELETE: returns { trigger }

🧪 Example .env (for Neon)

DATABASE_URL=postgres://user:[email protected]/dbname?sslmode=require
USE_NEON_DRIVER=true

📝 License

MIT License © 2025 slynxcz