> ## Documentation Index
> Fetch the complete documentation index at: https://mintlify.com/supermacro/neverthrow/llms.txt
> Use this file to discover all available pages before exploring further.

# ok()

> Constructor function that creates an Ok variant of Result

## Overview

Constructs an `Ok` variant of `Result`. This represents a successful computation with a value.

## Signature

```typescript theme={null}
function ok<T, E = never>(value: T): Ok<T, E>
function ok<T extends void = void, E = never>(value: void): Ok<void, E>
```

## Parameters

<ParamField path="value" type="T" required>
  The success value to wrap in an Ok result. Can be any type including `null`, `undefined`, or `void`.
</ParamField>

## Returns

Returns an `Ok<T, E>` instance containing the provided value.

## Examples

### Basic Usage

```typescript theme={null}
import { ok } from 'neverthrow'

const myResult = ok({ myData: 'test' })

myResult.isOk() // true
myResult.isErr() // false
```

### With Null or Undefined

```typescript theme={null}
// With null
const okNull = ok(null)
okNull.isOk() // true
okNull._unsafeUnwrap() // null

// With undefined
const okUndefined = ok(undefined)
okUndefined.isOk() // true
okUndefined._unsafeUnwrap() // undefined
```

### Type Annotations

```typescript theme={null}
// Explicitly specify both success and error types
const result = ok<number, string>(42)
// result is Ok<number, string>

// For void results
const voidResult = ok<void>(undefined)
```

## Related

* [err()](/api/result/err) - Create an Err variant
* [Result.isOk()](/api/result/is-ok) - Check if a Result is Ok
* [Result.isErr()](/api/result/is-err) - Check if a Result is Err