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Global Values

The ECMAScript global value properties in SSJS — undefined works, NaN mostly works (lowercase string), but Infinity is severely broken (sign inverted in comparisons and string coercion), and the ES2020 globalThis is missing.

Runtime verified Differs from official docs

The ECMAScript global value properties have mixed support in SSJS. undefined works exactly as expected and NaN behaves correctly for comparisons (only its string form is lowercase). Infinity is severely broken in the SFMC Jint engine: its sign is inverted in both numeric comparisons and string coercion (Infinity > 0 returns false, String(Infinity) yields -infinity). The ES2020 globalThis is not defined.

Status legend

Icon Meaning
✅ Works Available and behaves as expected
⚠️ Partial Available but with a documented caveat or bug
❌ Missing Not available (or undefined) — use the workaround

Members

Member ES Status Notes
undefined ES3 ✅ Works  
NaN ES3 ⚠️ Partial String(NaN) is lowercase nan — 

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</svg>

Pending   </span>

</span> | | Infinity | ES3 | ⚠️ Partial | Sign inverted: Infinity > 0 is false, String(Infinity) is -infinity —

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  <path d="M6 8.3v.2" stroke="currentColor" stroke-width="1.2" stroke-linecap="round"/>
</svg>

Pending   </span>

</span> | | globalThis | ES2020 | ❌ Missing | undefined — no global-object reference is exposed |

undefined

(ES3) — ✅ Works. The primitive undefined value. typeof undefined is "undefined", an unassigned declared variable is undefined, and String(undefined) is "undefined".

var x;
(typeof x === "undefined");   // true
(undefined === undefined);    // true
String(undefined);            // "undefined"

NaN

(ES3) — ⚠️ Partial.

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  <circle cx="6" cy="6" r="4.5" stroke="currentColor" stroke-width="1.2"/>
  <path d="M6 3.5v3" stroke="currentColor" stroke-width="1.2" stroke-linecap="round"/>
  <path d="M6 8.3v.2" stroke="currentColor" stroke-width="1.2" stroke-linecap="round"/>
</svg>

Pending   </span>

</span> The not-a-number value. Comparisons behave correctly — NaN === NaN is false, isNaN(NaN) is true. Only its string coercion is lowercase (nan) instead of the spec’s NaN.

(NaN === NaN);    // false
isNaN(NaN);       // true
String(NaN);      // "nan" in SFMC (spec: "NaN")

Infinity

(ES3) — ⚠️ Partial.

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  <path d="M6 3.5v3" stroke="currentColor" stroke-width="1.2" stroke-linecap="round"/>
  <path d="M6 8.3v.2" stroke="currentColor" stroke-width="1.2" stroke-linecap="round"/>
</svg>

Pending   </span>

</span> The Infinity global is broken in the SFMC Jint engine. typeof Infinity is "number" and Infinity === (1/0) holds, but its sign is inverted everywhere else: Infinity > 0 returns false, Infinity < 0 returns true, and String(Infinity) yields -infinity. Symmetrically, -Infinity (and -1/0) compares as positive and stringifies to infinity. Even Infinity > 1e308 returns false. Do not rely on Infinity/-Infinity for magnitude comparisons or output — compare against a concrete large numeric literal instead.

typeof Infinity;      // "number"
Infinity > 0;         // false  (BUG — should be true)
Infinity < 0;         // true   (BUG)
String(Infinity);     // "-infinity"  (BUG — sign inverted, lowercase)
String(-Infinity);    // "infinity"   (BUG)
Infinity > 1e308;     // false  (BUG)

globalThis

(ES2020) — ❌ Missing. globalThis is not defined in the SFMC engine (typeof globalThis === "undefined"). There is no standard reference to the global object; top-level this is also unusable (referencing this at top scope crashes the CloudPage). Reference the specific globals (Platform, Variable, …) you need directly.

(typeof globalThis === "undefined");   // true — not available

See Also

See Also