Array operators check whether an array custom field contains or does not contain specific values.

### Client SDKs

Array operators work with all versions of all client SDKs except on-device eval client SDKs.

For on-device eval SDKs, the following SDKs and minimum versions are supported:

js-on-device-eval-client - v3.5.1

### Server SDKs

Array operators require the following minimum SDK versions:

| SDK | Minimum version | Notes |
|-----|----------------|-------|
| Node.js | v5.27.0 | |
| Node Lite | v0.4.0 | |
| Python | v0.42.0 | |
| Ruby | v2.1.0 | |
| Java/Kotlin Server | v1.26.0 | |
| PHP | v3.5.0 | |
| Go | v1.31.0 | Supports `[]interface{}` only |
| .Net Server | v2.1.0 | Supports JArray only |

All [Server Core](/server-core/) SDKs support array operators in all versions.