# node:util
# `node:util`
## Import
```js
import util from "nstdlib/util";
```
> [!NOTE]
> Its behavior matches Node.js.
## Runtime support
| Where it runs | Status | Export coverage | Details |
| ------------- | ------ | --------------- | ------- |
| **nstd** | ⚠️ some support | – | 12/28 of Node's own eligible tests pass under nstd. |
| **Browser** | ❔ not tested | 100% of Node.js | It imports with the small process shim. 34/34 Node.js exports are available. No module-specific behavior test ran. |
| **Node.js (host)** | ✅ works | 100% of Node.js | 34/34 exports. |
## Exports (34 of 34)
Each cell shows what happens when code reads an export:
- ✅ Available through every import style. A named error also counts.
- ⚠️ Available through only some import styles.
- ❔ The export exists but has no value.
- ❌ The export does not exist.
- – This environment was not measured.
| Export | Node.js | nstdlib | browser |
| ------ | ------- | ------- | ------- |
| `MIMEParams` | ✅ | ✅ | ✅ |
| `MIMEType` | ✅ | ✅ | ✅ |
| `TextDecoder` | ✅ | ✅ | ✅ |
| `TextEncoder` | ✅ | ✅ | ✅ |
| `_errnoException` | ✅ | ✅ | ✅ |
| `_exceptionWithHostPort` | ✅ | ✅ | ✅ |
| `_extend` | ✅ | ✅ | ✅ |
| `aborted` | ✅ | ✅ | ✅ |
| `callbackify` | ✅ | ✅ | ✅ |
| `convertProcessSignalToExitCode` | ✅ | ✅ | ✅ |
| `debug` | ✅ | ✅ | ✅ |
| `debuglog` | ✅ | ✅ | ✅ |
| `deprecate` | ✅ | ✅ | ✅ |
| `diff` | ✅ | ✅ | ✅ |
| `format` | ✅ | ✅ | ✅ |
| `formatWithOptions` | ✅ | ✅ | ✅ |
| `getCallSites` | ✅ | ✅ | ✅ |
| `getSystemErrorMap` | ✅ | ✅ | ✅ |
| `getSystemErrorMessage` | ✅ | ✅ | ✅ |
| `getSystemErrorName` | ✅ | ✅ | ✅ |
| `inherits` | ✅ | ✅ | ✅ |
| `inspect` | ✅ | ✅ | ✅ |
| `isArray` | ✅ | ✅ | ✅ |
| `isDeepStrictEqual` | ✅ | ✅ | ✅ |
| `parseArgs` | ✅ | ✅ | ✅ |
| `parseEnv` | ✅ | ✅ | ✅ |
| `promisify` | ✅ | ✅ | ✅ |
| `setTraceSigInt` | ✅ | ✅ | ✅ |
| `stripVTControlCharacters` | ✅ | ✅ | ✅ |
| `styleText` | ✅ | ✅ | ✅ |
| `toUSVString` | ✅ | ✅ | ✅ |
| `transferableAbortController` | ✅ | ✅ | ✅ |
| `transferableAbortSignal` | ✅ | ✅ | ✅ |
| `types` | ✅ | ✅ | ✅ |