Write

Parameters

Name	Type	Required	Description
`content`	string	Yes	The string to output to the page.

Description

Write() appends the given string to the page output at the position of the <script runat="server"> block. It does not add a newline — concatenate "\n" or "<br>" manually if needed.

The output is written into the final rendered HTML document. In email contexts, it is written into the email body. In Automation Studio, output is written to the activity log.

Examples

Basic output

Write("Hello, World!");

Output: Hello, World!

HTML output

var name = Platform.Request.GetQueryStringParameter("name") || "Subscriber";
Write("<h1>Welcome, " + name + "</h1>");
Write('<p class="subtitle">We\'re glad you\'re here.</p>');

Multiple Write calls

Multiple calls append sequentially — they don’t overwrite each other:

Write("<ul>");
var rows = Platform.Function.LookupRows("Products", "Active", "1");
for (var i = 0, len = rows.length; i < len; i++) {
    Write("<li>" + rows[i]["Name"] + "</li>");
}
Write("</ul>");

Conditional output

var isAdmin = Platform.Function.Lookup("Users", "IsAdmin", "Key", userKey);
if (isAdmin === "1") {
    Write('<a href="/admin">Admin Panel</a>');
}

Debug output

During development, use Write to inspect variable values:

// Wrap in a debug guard so you don't expose data in production
var debug = Platform.Request.GetQueryStringParameter("debug") === "1";
if (debug) {
    Write('<pre style="color:orange">' + Stringify(dataObject) + '</pre>');
}

Common Mistakes

Forgetting to convert to string: Write expects a string. Non-string values are automatically coerced via toString(), but complex objects will output [object Object]. Use Stringify() for objects:

// ❌ Outputs "[object Object]"
Write(myObject);

// ✅ Serialize first
Write(Stringify(myObject));

Unescaped HTML in dynamic content: If writing user-provided content into the page, escape it to prevent XSS:

function escapeHtml(str) {
    return (str + "")
        .replace(/&/g, "&amp;")
        .replace(/</g, "&lt;")
        .replace(/>/g, "&gt;")
        .replace(/"/g, "&quot;");
}

Write("<p>" + escapeHtml(userInput) + "</p>");