> ## Documentation Index
> Fetch the complete documentation index at: https://bun.manicule.dev/llms.txt
> Use this file to discover all available pages before exploring further.
> For every page in one file, fetch https://bun.manicule.dev/llms-full.txt (large).
> To search and read these docs as tools, connect the MCP server at https://bun.manicule.dev/api/mcp.
> Every agent surface: https://bun.manicule.dev/.well-known/llms-manifest.json

# Semver (/runtime/semver)

<!-- agent-signals: reading_time_min: 1 · est_tokens: 474 · updated: 2026-08-02 -->
Related: [Watch Mode](/runtime/watch-mode.md), [Debugging](/runtime/debugger.md), [REPL](/runtime/repl.md), [bunfig.toml](/runtime/bunfig.md), [File Types](/runtime/file-types.md), [Module Resolution](/runtime/module-resolution.md)

> Use Bun's semantic versioning API

`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`

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`

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.