Nuxt/docs/3.api/5.kit/2.programmatic.md

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---
title: "Programmatic Usage"
description: Nuxt Kit provides a set of utilities to help you work with Nuxt programmatically. These functions allow you to load Nuxt, build Nuxt, and load Nuxt configuration.
links:
- label: Source
icon: i-simple-icons-github
to: https://github.com/nuxt/nuxt/blob/main/packages/kit/src/loader
size: xs
---
Programmatic usage can be helpful when you want to use Nuxt programmatically, for example, when building a [CLI tool](https://github.com/nuxt/cli) or [test utils](https://github.com/nuxt/nuxt/tree/main/packages/test-utils).
## `loadNuxt`
Load Nuxt programmatically. It will load the Nuxt configuration, instantiate and return the promise with Nuxt instance.
### Type
```ts
async function loadNuxt (loadOptions?: LoadNuxtOptions): Promise<Nuxt>
interface LoadNuxtOptions extends LoadNuxtConfigOptions {
dev?: boolean
ready?: boolean
}
```
### Parameters
#### `loadOptions`
**Type**: `LoadNuxtOptions`
**Default**: `{}`
Loading conditions for Nuxt. `loadNuxt` uses [`c12`](https://github.com/unjs/c12) under the hood, so it accepts the same options as `c12.loadConfig` with some additional options:
- `dev` (optional)
**Type**: `boolean`
**Default**: `false`
If set to `true`, Nuxt will be loaded in development mode.
- `ready` (optional)
**Type**: `boolean`
**Default**: `true`
If set to `true`, Nuxt will be ready to use after the `loadNuxt` call. If set to `false`, you will need to call `nuxt.ready()` to make sure Nuxt is ready to use.
## `buildNuxt`
Build Nuxt programmatically. It will invoke the builder (currently [@nuxt/vite-builder](https://github.com/nuxt/nuxt/tree/main/packages/vite) or [@nuxt/webpack-builder](https://github.com/nuxt/nuxt/tree/main/packages/webpack)) to bundle the application.
### Type
```ts
async function buildNuxt (nuxt: Nuxt): Promise<any>
```
### Parameters
#### `nuxt`
**Type**: `Nuxt`
**Required**: `true`
Nuxt instance to build. It can be retrieved from the context via `useNuxt()` call.
## `loadNuxtConfig`
Load Nuxt configuration. It will return the promise with the configuration object.
### Type
```ts
async function loadNuxtConfig (options: LoadNuxtConfigOptions): Promise<NuxtOptions>
```
### Parameters
#### `options`
**Type**: `LoadNuxtConfigOptions`
**Required**: `true`
Options to pass in [`c12`](https://github.com/unjs/c12#options) `loadConfig` call.
## `writeTypes`
Generates tsconfig.json and writes it to the project buildDir.
### Type
```ts
function writeTypes (nuxt?: Nuxt): void
interface Nuxt {
options: NuxtOptions
hooks: Hookable<NuxtHooks>
hook: Nuxt['hooks']['hook']
callHook: Nuxt['hooks']['callHook']
addHooks: Nuxt['hooks']['addHooks']
ready: () => Promise<void>
close: () => Promise<void>
server?: any
vfs: Record<string, string>
apps: Record<string, NuxtApp>
}
```
### Parameters
#### `nuxt`
**Type**: `Nuxt`
**Required**: `true`
Nuxt instance to build. It can be retrieved from the context via `useNuxt()` call.