Nuxt/docs/3.api/5.kit/3.compatibility.md

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---
title: "Compatibility"
description: Nuxt Kit provides a set of utilities to help you check the compatibility of your modules with different Nuxt versions.
links:
- label: Source
icon: i-simple-icons-github
to: https://github.com/nuxt/nuxt/blob/main/packages/kit/src/compatibility.ts
size: xs
---
Nuxt Kit utilities can be used in Nuxt 3, Nuxt 2 with Bridge and even Nuxt 2 without Bridge. To make sure your module is compatible with all versions, you can use the `checkNuxtCompatibility`, `assertNuxtCompatibility` and `hasNuxtCompatibility` functions. They will check if the current Nuxt version meets the constraints you provide. Also you can use `isNuxt2`, `isNuxt3` and `getNuxtVersion` functions for more granular checks.
## `checkNuxtCompatibility`
Checks if constraints are met for the current Nuxt version. If not, returns an array of messages. Nuxt 2 version also checks for `bridge` support.
### Type
```ts
async function checkNuxtCompatibility(
constraints: NuxtCompatibility,
nuxt?: Nuxt
): Promise<NuxtCompatibilityIssues>;
interface NuxtCompatibility {
nuxt?: string;
bridge?: boolean;
}
interface NuxtCompatibilityIssue {
name: string;
message: string;
}
interface NuxtCompatibilityIssues extends Array<NuxtCompatibilityIssue> {
toString(): string;
}
```
### Parameters
#### `constraints`
**Type**: `NuxtCompatibility`
**Default**: `{}`
Constraints to check for. It accepts the following properties:
- `nuxt` (optional)
**Type**: `string`
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Nuxt version in semver format. Versions may be defined in Node.js way, for example: `>=2.15.0 <3.0.0`.
- `bridge` (optional)
**Type**: `boolean`
If set to `true`, it will check if the current Nuxt version supports `bridge`.
#### `nuxt`
**Type**: `Nuxt`
**Default**: `useNuxt()`
Nuxt instance. If not provided, it will be retrieved from the context via `useNuxt()` call.
## `assertNuxtCompatibility`
Asserts that constraints are met for the current Nuxt version. If not, throws an error with the list of issues as string.
### Type
```ts
async function assertNuxtCompatibility(
constraints: NuxtCompatibility,
nuxt?: Nuxt
): Promise<true>;
interface NuxtCompatibility {
nuxt?: string;
bridge?: boolean;
}
```
### Parameters
#### `constraints`
**Type**: `NuxtCompatibility`
**Default**: `{}`
Constraints to check for. It accepts the following properties:
- `nuxt` (optional)
**Type**: `string`
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Nuxt version in semver format. Versions may be defined in Node.js way, for example: `>=2.15.0 <3.0.0`.
- `bridge` (optional)
**Type**: `boolean`
If set to `true`, it will check if the current Nuxt version supports `bridge`.
#### `nuxt`
**Type**: `Nuxt`
**Default**: `useNuxt()`
Nuxt instance. If not provided, it will be retrieved from the context via `useNuxt()` call.
## `hasNuxtCompatibility`
Checks if constraints are met for the current Nuxt version. Return `true` if all constraints are met, otherwise returns `false`. Nuxt 2 version also checks for `bridge` support.
### Type
```ts
async function hasNuxtCompatibility(
constraints: NuxtCompatibility,
nuxt?: Nuxt
): Promise<boolean>;
interface NuxtCompatibility {
nuxt?: string;
bridge?: boolean;
}
```
### Parameters
#### `constraints`
**Type**: `NuxtCompatibility`
**Default**: `{}`
Constraints to check for. It accepts the following properties:
- `nuxt` (optional)
**Type**: `string`
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Nuxt version in semver format. Versions may be defined in Node.js way, for example: `>=2.15.0 <3.0.0`.
- `bridge` (optional)
**Type**: `boolean`
If set to `true`, it will check if the current Nuxt version supports `bridge`.
#### `nuxt`
**Type**: `Nuxt`
**Default**: `useNuxt()`
Nuxt instance. If not provided, it will be retrieved from the context via `useNuxt()` call.
## `isNuxt2`
Checks if the current Nuxt version is 2.x.
### Type
```ts
function isNuxt2(nuxt?: Nuxt): boolean;
```
### Parameters
#### `nuxt`
**Type**: `Nuxt`
**Default**: `useNuxt()`
Nuxt instance. If not provided, it will be retrieved from the context via `useNuxt()` call.
## `isNuxt3`
Checks if the current Nuxt version is 3.x.
### Type
```ts
function isNuxt3(nuxt?: Nuxt): boolean;
```
### Parameters
#### `nuxt`
**Type**: `Nuxt`
**Default**: `useNuxt()`
Nuxt instance. If not provided, it will be retrieved from the context via `useNuxt()` call.
## `getNuxtVersion`
Returns the current Nuxt version.
### Type
```ts
function getNuxtVersion(nuxt?: Nuxt): string;
```
### Parameters
#### `nuxt`
**Type**: `Nuxt`
**Default**: `useNuxt()`
Nuxt instance. If not provided, it will be retrieved from the context via `useNuxt()` call.