# write [](https://www.npmjs.com/package/write) [](https://npmjs.org/package/write) [](https://npmjs.org/package/write) [](https://travis-ci.org/jonschlinkert/write)
> Write data to a file, replacing the file if it already exists and creating any intermediate directories if they don't already exist. Thin wrapper around node's native fs methods.
## Install
Install with [npm](https://www.npmjs.com/):
```sh
$ npm install --save write
```
## Usage
```js
var writeFile = require('write');
```
## API
### [writeFile](index.js#L40)
Asynchronously writes data to a file, replacing the file if it already exists and creating any intermediate directories if they don't already exist. Data can be a string or a buffer. Returns a promise if a callback function is not passed.
**Params**
* `filepath` **{string|Buffer|integer}**: filepath or file descriptor.
* `data` **{string|Buffer|Uint8Array}**: String to write to disk.
* `options` **{object}**: Options to pass to [fs.writeFile](https://nodejs.org/api/fs.html#fs_fs_writefile_file_data_options_callback) and/or [mkdirp](https://github.com/substack/node-mkdirp)
* `callback` **{Function}**: (optional) If no callback is provided, a promise is returned.
**Example**
```js
var writeFile = require('write');
writeFile('foo.txt', 'This is content...', function(err) {
if (err) console.log(err);
});
// promise
writeFile('foo.txt', 'This is content...')
.then(function() {
// do stuff
});
```
### [.promise](index.js#L82)
The promise version of [writeFile](#writefile). Returns a promise.
**Params**
* `filepath` **{string|Buffer|integer}**: filepath or file descriptor.
* `val` **{string|Buffer|Uint8Array}**: String or buffer to write to disk.
* `options` **{object}**: Options to pass to [fs.writeFile](https://nodejs.org/api/fs.html#fs_fs_writefile_file_data_options_callback) and/or [mkdirp](https://github.com/substack/node-mkdirp)
* `returns` **{Promise}**
**Example**
```js
var writeFile = require('write');
writeFile.promise('foo.txt', 'This is content...')
.then(function() {
// do stuff
});
```
### [.sync](index.js#L120)
The synchronous version of [writeFile](#writefile). Returns undefined.
**Params**
* `filepath` **{string|Buffer|integer}**: filepath or file descriptor.
* `data` **{string|Buffer|Uint8Array}**: String or buffer to write to disk.
* `options` **{object}**: Options to pass to [fs.writeFileSync](https://nodejs.org/api/fs.html#fs_fs_writefilesync_file_data_options) and/or [mkdirp](https://github.com/substack/node-mkdirp)
* `returns` **{undefined}**
**Example**
```js
var writeFile = require('write');
writeFile.sync('foo.txt', 'This is content...');
```
### [.stream](index.js#L151)
Uses `fs.createWriteStream` to write data to a file, replacing the file if it already exists and creating any intermediate directories if they don't already exist. Data can be a string or a buffer. Returns a new [WriteStream](https://nodejs.org/api/fs.html#fs_class_fs_writestream) object.
**Params**
* `filepath` **{string|Buffer|integer}**: filepath or file descriptor.
* `options` **{object}**: Options to pass to [mkdirp](https://github.com/substack/node-mkdirp) and [fs.createWriteStream](https://nodejs.org/api/fs.html#fs_fs_createwritestream_path_options)
* `returns` **{Stream}**: Returns a new [WriteStream](https://nodejs.org/api/fs.html#fs_class_fs_writestream) object. (See [Writable Stream](https://nodejs.org/api/stream.html#stream_class_stream_writable)).
**Example**
```js
var fs = require('fs');
var writeFile = require('write');
fs.createReadStream('README.md')
.pipe(writeFile.stream('a/b/c/other-file.md'))
.on('close', function() {
// do stuff
});
```
## Release history
### v1.0.2 - 2017-07-11
* improved documentation
### v1.0.0 - 2017-07-09
**Added**
* [promise support](#promise)
**Changed**
* The main export will now return a promise if no callback is passed
## About
### Related projects
* [delete](https://www.npmjs.com/package/delete): Delete files and folders and any intermediate directories if they exist (sync and async). | [homepage](https://github.com/jonschlinkert/delete "Delete files and folders and any intermediate directories if they exist (sync and async).")
* [read-data](https://www.npmjs.com/package/read-data): Read JSON or YAML files. | [homepage](https://github.com/jonschlinkert/read-data "Read JSON or YAML files.")
* [read-yaml](https://www.npmjs.com/package/read-yaml): Very thin wrapper around js-yaml for directly reading in YAML files. | [homepage](https://github.com/jonschlinkert/read-yaml "Very thin wrapper around js-yaml for directly reading in YAML files.")
* [write-data](https://www.npmjs.com/package/write-data): Write a YAML or JSON file to disk. Automatically detects the format to write based… [more](https://github.com/jonschlinkert/write-data) | [homepage](https://github.com/jonschlinkert/write-data "Write a YAML or JSON file to disk. Automatically detects the format to write based on extension. Or pass `ext` on the options.")
* [write-json](https://www.npmjs.com/package/write-json): Write a JSON file to disk, also creates intermediate directories in the destination path if… [more](https://github.com/jonschlinkert/write-json) | [homepage](https://github.com/jonschlinkert/write-json "Write a JSON file to disk, also creates intermediate directories in the destination path if they don't already exist.")
* [write-yaml](https://www.npmjs.com/package/write-yaml): Write YAML. Converts JSON to YAML writes it to the specified file. | [homepage](https://github.com/jonschlinkert/write-yaml "Write YAML. Converts JSON to YAML writes it to the specified file.")
### Contributing
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
### Contributors
| **Commits** | **Contributor** |
| --- | --- |
| 33 | [jonschlinkert](https://github.com/jonschlinkert) |
| 1 | [tunnckoCore](https://github.com/tunnckoCore) |
### Building docs
_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
To generate the readme, run the following command:
```sh
$ npm install -g verbose/verb#dev verb-generate-readme && verb
```
### Running tests
Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
```sh
$ npm install && npm test
```
### Author
**Jon Schlinkert**
* [github/jonschlinkert](https://github.com/jonschlinkert)
* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
### License
Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
Released under the [MIT License](LICENSE).
***
_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on July 11, 2017._
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