JavaScript running in a browser cannot directly insert records into a SQL Server database for security reasons. The correct architecture is:
HTML Form → JavaScript → Server-side API (ASP.NET, PHP, Node.js, Java, etc.) → SQL Server
If you want to learn the process, here is a complete example using HTML, JavaScript, and an ASP.NET Web API.
Step 1: HTML Page
<!DOCTYPE html>
<html>
<head>
<title>Insert Record</title>
</head>
<body>
<h2>Student Registration</h2>
Name :
<input type="text" id="txtName"><br><br>
Email :
<input type="text" id="txtEmail"><br><br>
<input type="button" value="Save" onclick="saveData()">
<p id="msg"></p>
<script>
function saveData() {
var name = document.getElementById("txtName").value;
var email = document.getElementById("txtEmail").value;
if(name=="" || email=="")
{
alert("Please fill all fields.");
return;
}
fetch("https://localhost:5001/api/student", {
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify({
Name: name,
Email: email
})
})
.then(response => response.text())
.then(data => {
document.getElementById("msg").innerHTML = data;
})
.catch(error => {
console.log(error);
});
}
</script>
</body>
</html>
Step 2: SQL Server Table
CREATE TABLE Student
(
Id INT IDENTITY(1,1) PRIMARY KEY,
Name VARCHAR(100),
Email VARCHAR(100)
)
Step 3: ASP.NET C# API
[HttpPost]
public string Post(Student s)
{
SqlConnection con = new SqlConnection(
"Server=.;Database=CollegeDB;Trusted_Connection=True;");
con.Open();
SqlCommand cmd = new SqlCommand(
"INSERT INTO Student(Name,Email) VALUES(@Name,@Email)", con);
cmd.Parameters.AddWithValue("@Name", s.Name);
cmd.Parameters.AddWithValue("@Email", s.Email);
cmd.ExecuteNonQuery();
con.Close();
return "Record Saved Successfully";
}
Data Flow
HTML TextBox
│
▼
JavaScript
(fetch API)
│
▼
ASP.NET Web API
│
▼
SQL Server Database
Important Note
❌ This is not possible:
// JavaScript cannot connect directly to SQL Server
var con = new SqlConnection(...);
Browsers do not allow direct database connections because it would expose your database credentials to anyone using the website.
If you are teaching Web Technology, I can also provide a complete CRUD (Insert, Update, Delete, Select) project using:
- HTML
- CSS
- JavaScript
- ASP.NET Web API
- SQL Server
with source code and database scripts.
