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toFixedNumber — GTM Variable Template for Number

VARIABLES › NUMBER
toFixedNumber EXTENDED Number
Direct (.tpl) Apply (.tpl)

Rounds a number to a fixed number of decimal places and returns it as a number.

When to Use This

Section titled “When to Use This”
Formatting

Normalize casing, spacing, encoding, and presentation of data values.

Examples

Section titled “Examples”
Round to 2 decimals
INPUT
Number To Round: 3.14159
Decimal Places: 2
OUTPUT
3.14
Round to integer
INPUT
Number To Round: 10.5
Decimal Places: 0
OUTPUT
11

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.

toFixedNumber
Number To Round
💾 The number to round to fixed decimal places.

Supported formats:
  ✓ Number
  ✓ String
Decimal Places
🎯 Number of decimal places to keep.

Supported formats:
  ✓ Number
  ✓ String
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.
Number To Round number
💡 Type any text to see the result update live
🎯 Using special value — click input to type instead
Test with:
Falsy
Truthy
Decimal Places number
🔗 Result Handling — Chain Variables
Chain apply-mode variables to the output. Each variable receives the result of the previous one.
toFixedNumber()
Section titled “Related Variables”

Same category: Number

→ absolute → addValues → calculateDiffRatio → ceil → clamp → classifyByThreshold → countDigits → divide → floor → max → min → multiply → parseCurrency → parseFloatValue → parseIntValue → percentOf → scaleToRange → squareRoot → subtractValues → toFixed → toInteger → 🧩 WEIGHTED (Advanced) → 🧩 WEIGHTED (Predefined)

Under the Hood

Section titled “Under the Hood”
📜 View Implementation Code
/**
* Rounds a number to a fixed number of decimal places using Math.round.
*
* @param {number} data.src - The number to round.
* @param {number|string} data.dec - Number of decimal places to keep.
* @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 rounding.
*
* @returns {number} The rounded number.
*
* @framework ggLowCodeGTMKit
*/
const Math = require('Math');
const makeNumber = require('makeNumber');


const toFixedNumber = function(num, decimals) {
   const numValue = makeNumber(num);
   const decValue = makeNumber(decimals);
   if (numValue !== numValue || decValue !== decValue) { return undefined; }
   const factor = Math.pow(10, decValue);
   return Math.round(numValue * factor) / factor;
};
const safeFunction = fn => typeof fn === 'function' ? fn : x => x;
const out = safeFunction(data.out);
// ===============================================================================
// toFixedNumber - Direct mode
// ===============================================================================
const applyCast = (castFn, value) => safeFunction(castFn)(value);
const value = applyCast(data.pre, data.src);
return out(toFixedNumber(value, data.dec));
// ===============================================================================
// toFixedNumber(...) – Apply Mode
// ===============================================================================
/*
return function(value, decimals) {
   decimals = data.rp1 ? decimals : data.dec;
   return out(toFixedNumber(value, decimals));
};
*/
🧪 View Test Scenarios (4 tests)
✅ '[example] Round to 2 decimals'
✅ '[example] Round to integer'
✅ String number converts and rounds
✅ Invalid inputs return undefined