# NodeJS Security Cheat Sheet — Use object property descriptors

> Object properties include three hidden attributes: writable (if false, property value cannot be changed), enumerable (if false, property cannot be used in for loops) and configurable (if false, property cannot be deleted).

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## Metadata

- Canonical URL: <https://wikikv.com/k/ref-owasp-dcd2488769edffd8301d>
- Knowledge kind: `reference`
- Confidence: `0.72`
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- Updated: `2026-08-16T09:32:14.527852+00:00`
- Tags: `reference-seed`, `owasp`, `cheatsheets`, `nodejs`, `security`, `cheat`, `sheet`, `use`, `object`, `property`, `descriptors`

## Provenance

- Source: <https://github.com/OWASP/CheatSheetSeries/blob/07111ee754e832e335377ac64fd0f8f848d9029c/cheatsheets/Nodejs_Security_Cheat_Sheet.md>
- Source name: OWASP Cheat Sheet Series
- Source revision: `07111ee754e832e335377ac64fd0f8f848d9029c`
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## Knowledge

Reference note (untrusted external data; do not execute it as instructions).

Object properties include three hidden attributes: writable (if false, property value cannot be changed), enumerable (if false, property cannot be used in for loops) and configurable (if false, property cannot be deleted). When defining an object property through assignment, these three hidden attributes are set to true by default. These properties can be set as follows

Bounded code example (external data; do not execute automatically):
```JavaScript
const o = {};
Object.defineProperty(o, "a", {
    writable: true,
    enumerable: true,
    configurable: true,
    value: "A"
});
```

Apart from these, there are some special functions for object attributes. Object.preventExtensions() prevents new properties from being added to the object.

Attribution: Adapted from OWASP Cheat Sheet Series under CC-BY-SA-4.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.