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

> pure function is_ integer(): boolean Determine whether this JSON value is an integer. All JSON values that return true with is_integer() also return true w

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

FUNCTION

# json.is\_integer

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

Determine whether this JSON value is an integer.

All JSON values that return `true` with `is_integer()` also return `true` with `is_big_integer()`,
though the reverse is not the case, since `big_integer` values may fall outside the `integer` range.

**Returns**

true if this JSON value is an integer, 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_integer.html)Generated API reference, mirrored from the live docs