isSHA256 — GTM Variable Template for Logic

VARIABLES › LOGIC

isSHA256 EXTENDED Logic

Direct (.tpl) Apply (.tpl) Add to GTM

Checks if the provided value is SHA-256 hashed.

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When to Use This

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Examples

Valid SHA-256 hash▶ Try

INPUT

Value To Check: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

OUTPUT

true

Invalid hash returns false▶ Try

INPUT

Value To Check: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b85

OUTPUT

false

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Live Sandbox

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isSHA256

Read-Only Try Live

Value To Check

💾 The value to check.

Supported formats:
  ✓ All

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 Check string

💡 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.

isSHA256()

+ Chain another variable

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Related Variables

Same category: Logic

→ isArray → isDefined → isEmpty → isEmptyString → isEqualTo → isFalsy → isFunction → isGreaterThan → isGreaterThanOrEqualTo → isInRange → isInfinity → isInteger → isJSON → isLessThan → isLessThanOrEqualTo → isNaN → isNotArray → isNotEmptyString → isNotFunction → isNotJSON → isNotNaN → isNotNull → isNotNumber → isNotObject → isNotString → isNotURL → isNull → isNumber → isObject → isPrimitive → isString → isStringifiedNumber → isTruthy → isURL → isUndefined → isUnixTimestamp → isUnixTimestampMilliseconds → isUnixTimestampSeconds → isValidNumber → 🧩 AND → 🧩 IF (else) → 🧩 IF AND_OR → 🧩 IF ELSE IF (Advanced) → 🧩 IF ELSE IF (Predefined) → 🧩 NOT → 🧩 OR → 🧩 XOR

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Under the Hood

📜 View Implementation Code

/**
 * Checks if the value matches the SHA256 pattern.
 *
 * @param {any} data.src - The value to check.
 * @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 checking.
 *
 * @returns {boolean} True if the value matches the SHA256 pattern, false otherwise.
 *
 * @framework ggLowCodeGTMKit
 */
const isSHA256 = function(value) {
  const pattern = "^[a-f0-9]{64}$";
  return !!(
    typeof value === 'string' &&
    value.toLowerCase().match(pattern) &&
    value.toLowerCase().match(pattern)[0] === value.toLowerCase()
  );
};
const safeFunction = fn => typeof fn === 'function' ? fn : x => x;
const out = safeFunction(data.out);
// ===============================================================================
// isSHA256 - Direct mode
// ===============================================================================
const applyCast = (castFn, value) => safeFunction(castFn)(value);
const value = applyCast(data.pre, data.src);
return out(isSHA256(value));
// ===============================================================================
// isSHA256() – Apply Mode
// ===============================================================================
/*
return function(value) {
   return out(isSHA256(value));
};
*/

🧪 View Test Scenarios (6 tests)

✅ '[example] Valid SHA-256 hash'
✅ Valid SHA256 hash with uppercase - should return true
✅ '[example] Invalid hash returns false'
✅ Invalid too long - should return false
✅ Invalid contains invalid characters - should return false
✅ Not a string - should return false