deploy node expressjs mysql to render

prerequisites

2. **mysql**: you should have a mysql database set up.
3. **render account**: sign up for a free account on render.

```bash
mkdir express-mysql-app
cd express-mysql-app
npm init -y
```

2. **install required packages**:
```bash
npm install express mysql2 dotenv
```

3. **create the application structure**:
```bash
```

4. **set up your `.env` file**:
```plaintext
db_host=your_mysql_host
db_user=your_mysql_user
db_password=your_mysql_password
db_name=your_database_name
port=3000
```

```javascript
const express = require('express');
const mysql = require('mysql2');
require('dotenv').config();

const app = express();

// create mysql connection
});

// connect to mysql
if (err) {
return;
}
});

// define a simple route
});

// start the server
});
```

step 2: test locally

1. **run your application**:
```bash
...

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