# Semver (/docs/runtime/semver)

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Related: [Watch Mode](/docs/runtime/watch-mode.md), [Debugging](/docs/runtime/debugger.md), [REPL](/docs/runtime/repl.md), [bunfig.toml](/docs/runtime/bunfig.md), [File Types](/docs/runtime/file-types.md), [Module Resolution](/docs/runtime/module-resolution.md)

`Bun.semver` compares semantic versions and checks whether a version is compatible with a range of versions. Versions and ranges are designed to be compatible with `node-semver`, which npm clients use.

It's about 20x faster than `node-semver`.

<Frame>
  ![Benchmark](https://github.com/oven-sh/bun/assets/709451/94746adc-8aba-4baf-a143-3c355f8e0f78)
</Frame>

The API provides two functions:

## `Bun.semver.satisfies(version: string, range: string): boolean` [#bunsemversatisfiesversion-string-range-string-boolean]

Returns `true` if `version` satisfies `range`, otherwise `false`.

Example:

```typescript
import { semver } from "bun";

semver.satisfies("1.0.0", "^1.0.0"); // true
semver.satisfies("1.0.0", "^1.0.1"); // false
semver.satisfies("1.0.0", "~1.0.0"); // true
semver.satisfies("1.0.0", "~1.0.1"); // false
semver.satisfies("1.0.0", "1.0.0"); // true
semver.satisfies("1.0.0", "1.0.1"); // false
semver.satisfies("1.0.1", "1.0.0"); // false
semver.satisfies("1.0.0", "1.0.x"); // true
semver.satisfies("1.0.0", "1.x.x"); // true
semver.satisfies("1.0.0", "x.x.x"); // true
semver.satisfies("1.0.0", "1.0.0 - 2.0.0"); // true
semver.satisfies("1.0.0", "1.0.0 - 1.0.1"); // true
```

If `range` or `version` is invalid, it returns `false`.

## `Bun.semver.order(versionA: string, versionB: string): 0 | 1 | -1` [#bunsemverorderversiona-string-versionb-string-0--1---1]

Returns `0` if `versionA` and `versionB` are equal, `1` if `versionA` is greater than `versionB`, and `-1` if `versionA` is less than `versionB`.

Example:

```typescript
import { semver } from "bun";

semver.order("1.0.0", "1.0.0"); // 0
semver.order("1.0.0", "1.0.1"); // -1
semver.order("1.0.1", "1.0.0"); // 1

const unsorted = ["1.0.0", "1.0.1", "1.0.0-alpha", "1.0.0-beta", "1.0.0-rc"];
unsorted.sort(semver.order); // ["1.0.0-alpha", "1.0.0-beta", "1.0.0-rc", "1.0.0", "1.0.1"]
console.log(unsorted);
```

If you need other semver functions, feel free to open an issue or pull request.