# bson_iter_code()

## Synopsis

    #define BSON_ITER_HOLDS_CODE(iter) (bson_iter_type ((iter)) == BSON_TYPE_CODE)

    const char *
    bson_iter_code (const bson_iter_t *iter, uint32_t *length);

## Parameters

- `iter`: A bson_iter_t.
- `length`: A location for the length of the UTF-8 encoded string or NULL.

## Description

This function returns the contents of a BSON_TYPE_CODE field. The length of the string is stored in `length` if non-NULL.

It is invalid to call this function on a field that is not of type BSON_TYPE_CODE.

## Returns

A UTF-8 encoded string which should not be modified or freed.