128 lines
4.4 KiB
Markdown
128 lines
4.4 KiB
Markdown
# YAML <a href="https://www.npmjs.com/package/yaml"><img align="right" src="https://badge.fury.io/js/yaml.svg" title="npm package" /></a>
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`yaml` is a JavaScript parser and stringifier for [YAML](http://yaml.org/), a human friendly data serialization standard. It supports both parsing and stringifying data using all versions of YAML, along with all common data schemas. As a particularly distinguishing feature, `yaml` fully supports reading and writing comments and blank lines in YAML documents.
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The library is released under the ISC open source license, and the code is [available on GitHub](https://github.com/eemeli/yaml/). It has no external dependencies and runs on Node.js 6 and later, and in browsers from IE 11 upwards.
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For the purposes of versioning, any changes that break any of the endpoints or APIs documented here will be considered semver-major breaking changes. Undocumented library internals may change between minor versions, and previous APIs may be deprecated (but not removed).
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For more information, see the project's documentation site: [**eemeli.org/yaml/v1**](https://eemeli.org/yaml/v1/)
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To install:
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```sh
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npm install yaml
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```
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**Note:** This is `yaml@1`. You may also be interested in the next version, currently available as [`yaml@next`](https://www.npmjs.com/package/yaml/v/next).
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## API Overview
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The API provided by `yaml` has three layers, depending on how deep you need to go: [Parse & Stringify](https://eemeli.org/yaml/v1/#parse-amp-stringify), [Documents](https://eemeli.org/yaml/#documents), and the [CST Parser](https://eemeli.org/yaml/#cst-parser). The first has the simplest API and "just works", the second gets you all the bells and whistles supported by the library along with a decent [AST](https://eemeli.org/yaml/#content-nodes), and the third is the closest to YAML source, making it fast, raw, and crude.
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```js
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import YAML from 'yaml'
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// or
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const YAML = require('yaml')
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```
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### Parse & Stringify
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- [`YAML.parse(str, options): value`](https://eemeli.org/yaml/v1/#yaml-parse)
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- [`YAML.stringify(value, options): string`](https://eemeli.org/yaml/v1/#yaml-stringify)
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### YAML Documents
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- [`YAML.createNode(value, wrapScalars, tag): Node`](https://eemeli.org/yaml/v1/#creating-nodes)
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- [`YAML.defaultOptions`](https://eemeli.org/yaml/v1/#options)
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- [`YAML.Document`](https://eemeli.org/yaml/v1/#yaml-documents)
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- [`constructor(options)`](https://eemeli.org/yaml/v1/#creating-documents)
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- [`defaults`](https://eemeli.org/yaml/v1/#options)
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- [`#anchors`](https://eemeli.org/yaml/v1/#working-with-anchors)
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- [`#contents`](https://eemeli.org/yaml/v1/#content-nodes)
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- [`#errors`](https://eemeli.org/yaml/v1/#errors)
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- [`YAML.parseAllDocuments(str, options): YAML.Document[]`](https://eemeli.org/yaml/v1/#parsing-documents)
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- [`YAML.parseDocument(str, options): YAML.Document`](https://eemeli.org/yaml/v1/#parsing-documents)
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```js
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import { Pair, YAMLMap, YAMLSeq } from 'yaml/types'
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```
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- [`new Pair(key, value)`](https://eemeli.org/yaml/v1/#creating-nodes)
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- [`new YAMLMap()`](https://eemeli.org/yaml/v1/#creating-nodes)
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- [`new YAMLSeq()`](https://eemeli.org/yaml/v1/#creating-nodes)
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### CST Parser
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```js
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import parseCST from 'yaml/parse-cst'
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```
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- [`parseCST(str): CSTDocument[]`](https://eemeli.org/yaml/v1/#parsecst)
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- [`YAML.parseCST(str): CSTDocument[]`](https://eemeli.org/yaml/v1/#parsecst)
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## YAML.parse
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```yaml
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# file.yml
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YAML:
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- A human-readable data serialization language
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- https://en.wikipedia.org/wiki/YAML
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yaml:
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- A complete JavaScript implementation
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- https://www.npmjs.com/package/yaml
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```
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```js
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import fs from 'fs'
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import YAML from 'yaml'
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YAML.parse('3.14159')
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// 3.14159
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YAML.parse('[ true, false, maybe, null ]\n')
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// [ true, false, 'maybe', null ]
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const file = fs.readFileSync('./file.yml', 'utf8')
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YAML.parse(file)
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// { YAML:
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// [ 'A human-readable data serialization language',
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// 'https://en.wikipedia.org/wiki/YAML' ],
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// yaml:
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// [ 'A complete JavaScript implementation',
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// 'https://www.npmjs.com/package/yaml' ] }
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```
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## YAML.stringify
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```js
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import YAML from 'yaml'
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YAML.stringify(3.14159)
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// '3.14159\n'
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YAML.stringify([true, false, 'maybe', null])
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// `- true
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// - false
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// - maybe
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// - null
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// `
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YAML.stringify({ number: 3, plain: 'string', block: 'two\nlines\n' })
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// `number: 3
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// plain: string
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// block: >
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// two
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//
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// lines
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// `
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```
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---
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Browser testing provided by:
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<a href="https://www.browserstack.com/open-source">
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<img width=200 src="https://eemeli.org/yaml/images/browserstack.svg" />
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</a>
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