# node:assert
# `node:assert`
## Import
```js
import assert from "nstdlib/assert";
```
> [!NOTE]
> Its behavior matches Node.js.
## Runtime support
| Where it runs | Status | Export coverage | Details |
| ------------- | ------ | --------------- | ------- |
| **nstd** | ⚠️ some support | – | 5/14 of Node's own eligible tests pass under nstd. |
| **Browser** | ❔ not tested | 100% of Node.js | It imports with the small process shim. 21/21 Node.js exports are available. No module-specific behavior test ran. |
| **Node.js (host)** | ✅ works | 100% of Node.js | 21/21 exports. |
## Exports (21 of 21)
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 |
| ------ | ------- | ------- | ------- |
| `Assert` | ✅ | ✅ | ✅ |
| `AssertionError` | ✅ | ✅ | ✅ |
| `deepEqual` | ✅ | ✅ | ✅ |
| `deepStrictEqual` | ✅ | ✅ | ✅ |
| `doesNotMatch` | ✅ | ✅ | ✅ |
| `doesNotReject` | ✅ | ✅ | ✅ |
| `doesNotThrow` | ✅ | ✅ | ✅ |
| `equal` | ✅ | ✅ | ✅ |
| `fail` | ✅ | ✅ | ✅ |
| `ifError` | ✅ | ✅ | ✅ |
| `match` | ✅ | ✅ | ✅ |
| `notDeepEqual` | ✅ | ✅ | ✅ |
| `notDeepStrictEqual` | ✅ | ✅ | ✅ |
| `notEqual` | ✅ | ✅ | ✅ |
| `notStrictEqual` | ✅ | ✅ | ✅ |
| `ok` | ✅ | ✅ | ✅ |
| `partialDeepStrictEqual` | ✅ | ✅ | ✅ |
| `rejects` | ✅ | ✅ | ✅ |
| `strict` | ✅ | ✅ | ✅ |
| `strictEqual` | ✅ | ✅ | ✅ |
| `throws` | ✅ | ✅ | ✅ |