# node:v8

> The six node:v8 exports and their JSON serialization.

`node:v8` exports only these six members.

| Operation | Behavior |
|---|---|
| `cachedDataVersionTag()` | Returns a stable 32-bit tag for the running binary. |
| `getHeapStatistics()` | Returns a heap-statistics object in Node's format. |
| `getHeapSpaceStatistics()` | Returns one entry per memory pool, with names such as `eden space`. |
| `setFlagsFromString(flags)` | Accepts a string and has no effect. |
| `serialize(value)` | Encodes `JSON.stringify(value)` as UTF-8 in a `Uint8Array`. |
| `deserialize(buffer)` | Decodes UTF-8 and parses the JSON. |

`serialize` output is not V8's structured-clone format; circular objects throw `TypeError`.