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stripHtml — GTM Variable Template for String

VARIABLES › STRING
stripHtml EXTENDED String
Direct (.tpl) Apply (.tpl)

Sanitizes a string by removing HTML tags, replacing line breaks and tabs with spaces, collapsing multiple whitespace characters, and trimming leading/trailing whitespace.

Examples

Section titled “Examples”
Remove HTML tags
INPUT
Text To Sanitize: Hello World
OUTPUT
Hello World
Collapse multiple spaces
INPUT
Text To Sanitize: Hello World Test
OUTPUT
Hello World Test
Non-string input returns undefined
INPUT
Text To Sanitize: 12345
OUTPUT
undefined

Live Sandbox

Section titled “Live Sandbox”

This is what you'll see when you open this variable in Google Tag Manager. Hover the icons for details.

stripHtml
Text To Sanitize
💾 The string to sanitize and clean.

Supported formats:
  ✓ String
Input Setup
Input Function (optional)
⚙️ Optional pre-processing function applied to the input before internal logic (e.g., normalize encoding, convert to string). Internal transformations such as HTML removal will still apply afterward.
Result Handling
Output Function (optional)
⚙️ Optional function to apply to the result before returning it (e.g., str => str.toUpperCase(), val => val + ' cleaned' for string modifications). Useful for chaining transformations on the output.
Text To Sanitize string
💡 Type any text to see the result update live
🎯 Using special value — click input to type instead
Test with:
Falsy
Truthy
🔗 Result Handling — Chain Variables
Chain apply-mode variables to the output. Each variable receives the result of the previous one.
stripHtml()
Section titled “Related Variables”

Same category: String

→ charAt → collapseWhitespace → concat → countWordsInString → endsWith → extract → extractFirstSegment → extractNumber → fromBase64 → indexOf → left → matchAll → matchRegex → normalizeEmail → normalizePhone → padEnd → padStart → parseJSON → replaceAll → replaceAllWithRegex → replaceFirst → right → safeSplit → search → slice → slugify → split → startsWith → stripAccents → substringAfter → substringBefore → test → toBase64 → toCamelCase → toJsonString → toKebabCase → toLocaleLowerCase → toLocaleUpperCase → toLowerCase → toNumber → toSnakeCase → toStartCase → toString → toStringRepresentation → toUpperCase → toUpperFirst → trim → trimEnd → trimStart → truncate

Under the Hood

Section titled “Under the Hood”
📜 View Implementation Code
/**
* Sanitizes a string by:
* - Removing HTML tags
* - Replacing line breaks and tabs with spaces
* - Collapsing multiple whitespace characters into a single space
* - Trimming leading/trailing whitespace
*
* @param {string} data.src - The string to sanitize.
* @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 sanitizing.
*
* @returns {string|undefined} The cleaned string, or undefined if input is not a string.
*
* @framework ggLowCodeGTMKit
*/
const stripHtml = function(input) {
   if (typeof input !== 'string') {
       return undefined;
   }
   const blockTags = ['div', 'p', 'br', 'li', 'td', 'th', 'section', 'article'];
   let noTags = '';
   let insideTag = false;
   let tagBuffer = '';
   for (let i = 0; i < input.length; i++) {
       const char = input[i];
       if (char === '<') {
           insideTag = true;
           tagBuffer = '';
           continue;
       }
       if (char === '>') {
           insideTag = false;
           const tagName = tagBuffer.toLowerCase().split(' ')[0].replace('/', '');
           if (blockTags.indexOf(tagName) !== -1) {
               noTags += ' ';
           }
           continue;
       }
       if (insideTag) {
           tagBuffer += char;
       } else {
           noTags += char;
       }
   }
   let cleaned = noTags.split('\n').join(' ')
                       .split('\r').join(' ')
                       .split('\t').join(' ');
   while (cleaned.indexOf('  ') !== -1) {
       cleaned = cleaned.split('  ').join(' ');
   }
   return cleaned.trim();
};
const safeFunction = fn => typeof fn === 'function' ? fn : x => x;
const out = safeFunction(data.out);
// ===============================================================================
// stripHtml - Direct mode
// ===============================================================================
const applyCast = (castFn, value) => safeFunction(castFn)(value);
const value = applyCast(data.pre, data.src);
return out(stripHtml(value));
// ===============================================================================
// stripHtml() – Apply Mode
// ===============================================================================
/*
return function(value) {
  return out(stripHtml(value));
};
*/
🧪 View Test Scenarios (5 tests)
✅ '[example] Remove HTML tags'
✅ String with line breaks and tabs - should replace with spaces
✅ '[example] Collapse multiple spaces'
✅ Complex HTML with block tags - should add spaces for block elements
✅ '[example] Non-string input returns undefined'