toString — GTM Variable Template for String

VARIABLES › STRING

toString CORE String

Direct (.tpl) Apply (.tpl)

Converts a value to a string representation, or returns an empty string if the value is null or undefined.

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When to Use This

String Manipulation

Transform, clean, and normalize text data for consistent downstream processing.

Type Conversion

Safely convert between data types — strings, numbers, booleans, arrays, objects.

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Examples

Number to string▶ Try

INPUT

Value To Convert: 42

OUTPUT

42

Boolean to string▶ Try

INPUT

Value To Convert: true

OUTPUT

true

Null returns empty string▶ Try

INPUT

Value To Convert: null

OUTPUT

""

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GTM Configuration

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toString

Read-Only Try Live

Value To Convert

💾 The value to convert to a string representation.

Supported formats:
  ✓ Any

Input Setup

Input Function (optional)

⚙️ Optional pre-processing function applied to the input before internal logic (e.g., convert object to string, normalize case). Internal transformations such as case handling will still apply afterward.

Result Handling

Output Function (optional)

⚙️ Optional function to apply to the result before returning it (e.g., str => str + ' €', val => val !== undefined for boolean conversion). Useful for chaining transformations on the output.

Value To Convert any

💡 Type any text to see the result update live

🎯 Using special value — click input to type instead

Test with:

Falsy undefined null "" empty 0 false NaN

Truthy true 42 "hello" {} empty [] empty {a:1} [1,2,3]

🔗 Result Handling — Chain Variables

Chain apply-mode variables to the output. Each variable receives the result of the previous one.

toString()

+ Chain another variable

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Related Variables

Same category: String

→ assignParamsToString → charAt → concatenateValues → countWordsInString → endsWith → extract → extractFirstSegment → extractNumber → fromBase64 → indexOf → left → matchAll → matchRegex → omitParamsFromString → padEnd → padStart → pickParamsFromString → replaceAll → replaceAllWithRegex → replaceFirst → right → safeSplit → sanitizeTextAndRemoveHtml → sanitizeTextLite → search → slice → split → startsWith → test → toBase64 → toCamelCase → toJsonString → toKebabCase → toLocaleLowerCase → toLocaleUpperCase → toLowerCase → toNumber → toSnakeCase → toStartCase → toStringRepresentation → toUpperCase → toUpperFirst → trim → trimEnd → trimStart → truncate

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Under the Hood

📜 View Implementation Code

/**
* Converts a value to a string.
* 
* @param {any} data.src - The value to convert to a string.
* @param {Function|string} [data.out] - Optional output handler: function to transform result or string with format.
*
* Direct-mode specific parameters:
* @param {Function} [data.pre] - Optional pre-processor function to transform src before conversion.
* 
* @returns {string} The string representation of the value, or an empty string if the value is null or undefined.
*
* @framework ggLowCodeGTMKit
*/
const toString = function(value) {
   if (value == null) { return ''; }
   return value.toString();
};

const safeFunction = fn => typeof fn === 'function' ? fn : x => x;
const out = safeFunction(data.out);

// ===============================================================================
// toString - Direct mode
// ===============================================================================
const applyCast = (castFn, value) => safeFunction(castFn)(value);
const value = applyCast(data.pre, data.src);
return out(toString(value));
// ===============================================================================
// toString() – Apply Mode
// ===============================================================================
/*
return function(value) {
  return out(toString(value));
};
*/

🧪 View Test Scenarios (7 tests)

✅ '[example] Number to string'
✅ '[example] Boolean to string'
✅ Array to string - converts array to comma-separated string
✅ '[example] Null returns empty string'
✅ Undefined value - returns empty string
✅ Object to string - converts object to string representation
✅ Function to string - converts function to empty string (no toString in sandbox)