# json.is_null · Rell standard library · Chromia Docs (concept)

> pure function is_ null(): boolean Determine whether this JSON value is null. Returns true if this JSON value is null, false otherwise Since 0.14.16

Source: https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/json/is_null/

FUNCTION

# json.is\_null

```signature
pure function is_null(): boolean
```

Determine whether this JSON value is null.

**Returns**

true if this JSON value is null, false otherwise

Since 0.14.16

[View this page on docs.chromia.com](https://docs.chromia.com/pages/rell-stdlib/-rell%20-system%20-library/%5Broot%5D/json/is_null.html)Generated API reference, mirrored from the live docs