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					128 lines
				
				4.4 KiB
			| 
											3 years ago
										 | # YAML <a href="https://www.npmjs.com/package/yaml"><img align="right" src="https://badge.fury.io/js/yaml.svg" title="npm package" /></a>
 | ||
|  | 
 | ||
|  | `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. | ||
|  | 
 | ||
|  | 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. | ||
|  | 
 | ||
|  | 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). | ||
|  | 
 | ||
|  | For more information, see the project's documentation site: [**eemeli.org/yaml/v1**](https://eemeli.org/yaml/v1/) | ||
|  | 
 | ||
|  | To install: | ||
|  | 
 | ||
|  | ```sh | ||
|  | npm install yaml | ||
|  | ``` | ||
|  | 
 | ||
|  | **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). | ||
|  | 
 | ||
|  | ## API Overview
 | ||
|  | 
 | ||
|  | 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. | ||
|  | 
 | ||
|  | ```js | ||
|  | import YAML from 'yaml' | ||
|  | // or | ||
|  | const YAML = require('yaml') | ||
|  | ``` | ||
|  | 
 | ||
|  | ### Parse & Stringify
 | ||
|  | 
 | ||
|  | - [`YAML.parse(str, options): value`](https://eemeli.org/yaml/v1/#yaml-parse) | ||
|  | - [`YAML.stringify(value, options): string`](https://eemeli.org/yaml/v1/#yaml-stringify) | ||
|  | 
 | ||
|  | ### YAML Documents
 | ||
|  | 
 | ||
|  | - [`YAML.createNode(value, wrapScalars, tag): Node`](https://eemeli.org/yaml/v1/#creating-nodes) | ||
|  | - [`YAML.defaultOptions`](https://eemeli.org/yaml/v1/#options) | ||
|  | - [`YAML.Document`](https://eemeli.org/yaml/v1/#yaml-documents) | ||
|  |   - [`constructor(options)`](https://eemeli.org/yaml/v1/#creating-documents) | ||
|  |   - [`defaults`](https://eemeli.org/yaml/v1/#options) | ||
|  |   - [`#anchors`](https://eemeli.org/yaml/v1/#working-with-anchors) | ||
|  |   - [`#contents`](https://eemeli.org/yaml/v1/#content-nodes) | ||
|  |   - [`#errors`](https://eemeli.org/yaml/v1/#errors) | ||
|  | - [`YAML.parseAllDocuments(str, options): YAML.Document[]`](https://eemeli.org/yaml/v1/#parsing-documents) | ||
|  | - [`YAML.parseDocument(str, options): YAML.Document`](https://eemeli.org/yaml/v1/#parsing-documents) | ||
|  | 
 | ||
|  | ```js | ||
|  | import { Pair, YAMLMap, YAMLSeq } from 'yaml/types' | ||
|  | ``` | ||
|  | 
 | ||
|  | - [`new Pair(key, value)`](https://eemeli.org/yaml/v1/#creating-nodes) | ||
|  | - [`new YAMLMap()`](https://eemeli.org/yaml/v1/#creating-nodes) | ||
|  | - [`new YAMLSeq()`](https://eemeli.org/yaml/v1/#creating-nodes) | ||
|  | 
 | ||
|  | ### CST Parser
 | ||
|  | 
 | ||
|  | ```js | ||
|  | import parseCST from 'yaml/parse-cst' | ||
|  | ``` | ||
|  | 
 | ||
|  | - [`parseCST(str): CSTDocument[]`](https://eemeli.org/yaml/v1/#parsecst) | ||
|  | - [`YAML.parseCST(str): CSTDocument[]`](https://eemeli.org/yaml/v1/#parsecst) | ||
|  | 
 | ||
|  | ## YAML.parse
 | ||
|  | 
 | ||
|  | ```yaml | ||
|  | # file.yml
 | ||
|  | YAML: | ||
|  |   - A human-readable data serialization language | ||
|  |   - https://en.wikipedia.org/wiki/YAML | ||
|  | yaml: | ||
|  |   - A complete JavaScript implementation | ||
|  |   - https://www.npmjs.com/package/yaml | ||
|  | ``` | ||
|  | 
 | ||
|  | ```js | ||
|  | import fs from 'fs' | ||
|  | import YAML from 'yaml' | ||
|  | 
 | ||
|  | YAML.parse('3.14159') | ||
|  | // 3.14159 | ||
|  | 
 | ||
|  | YAML.parse('[ true, false, maybe, null ]\n') | ||
|  | // [ true, false, 'maybe', null ] | ||
|  | 
 | ||
|  | const file = fs.readFileSync('./file.yml', 'utf8') | ||
|  | YAML.parse(file) | ||
|  | // { YAML: | ||
|  | //   [ 'A human-readable data serialization language', | ||
|  | //     'https://en.wikipedia.org/wiki/YAML' ], | ||
|  | //   yaml: | ||
|  | //   [ 'A complete JavaScript implementation', | ||
|  | //     'https://www.npmjs.com/package/yaml' ] } | ||
|  | ``` | ||
|  | 
 | ||
|  | ## YAML.stringify
 | ||
|  | 
 | ||
|  | ```js | ||
|  | import YAML from 'yaml' | ||
|  | 
 | ||
|  | YAML.stringify(3.14159) | ||
|  | // '3.14159\n' | ||
|  | 
 | ||
|  | YAML.stringify([true, false, 'maybe', null]) | ||
|  | // `- true | ||
|  | // - false | ||
|  | // - maybe | ||
|  | // - null | ||
|  | // ` | ||
|  | 
 | ||
|  | YAML.stringify({ number: 3, plain: 'string', block: 'two\nlines\n' }) | ||
|  | // `number: 3 | ||
|  | // plain: string | ||
|  | // block: > | ||
|  | //   two | ||
|  | // | ||
|  | //   lines | ||
|  | // ` | ||
|  | ``` | ||
|  | 
 | ||
|  | --- | ||
|  | 
 | ||
|  | Browser testing provided by: | ||
|  | 
 | ||
|  | <a href="https://www.browserstack.com/open-source"> | ||
|  | <img width=200 src="https://eemeli.org/yaml/images/browserstack.svg" /> | ||
|  | </a> |