yamljs

Standalone JavaScript YAML 1.2 Parser & Encoder. Works under node.js and all major browsers. Also brings command line YAML/JSON conversion tools.
Mainly inspired from Symfony Yaml Component.

How to use

Import yaml.js in your html page:

<script type="text/javascript" src="yaml.js"></script>

Parse yaml string:

nativeObject = YAML.parse(yamlString);

Dump native object into yaml string:

yamlString = YAML.stringify(nativeObject[, inline /* @integer depth to start using inline notation at */[, spaces /* @integer number of spaces to use for indentation */] ]);

Load yaml file:

nativeObject = YAML.load('file.yml');

Load yaml file:

YAML.load('file.yml', function(result)
{
    nativeObject = result;
});

Use with node.js

Install module:

npm install yamljs

Use it:

YAML = require('yamljs');

// parse YAML string
nativeObject = YAML.parse(yamlString);

// Generate YAML
yamlString = YAML.stringify(nativeObject, 4);

// Load yaml file using YAML.load
nativeObject = YAML.load('myfile.yml');

Command line tools

You can enable the command line tools by installing yamljs as a global module:

npm install -g yamljs

Then, two cli commands should become available: yaml2json and json2yaml. They let you convert YAML to JSON and JSON to YAML very easily.
yaml2json

usage: yaml2json [-h] [-v] [-p] [-i INDENTATION] [-s] [-r] [-w] input

Positional arguments:
  input                 YAML file or directory containing YAML files.

Optional arguments:
  -h, --help            Show this help message and exit.
  -v, --version         Show program's version number and exit.
  -p, --pretty          Output pretty (indented) JSON.
  -i INDENTATION, --indentation INDENTATION
                        Number of space characters used to indent code (use 
                        with --pretty, default: 2).
  -s, --save            Save output inside JSON file(s) with the same name.
  -r, --recursive       If the input is a directory, also find YAML files in 
                        sub-directories recursively.
  -w, --watch           Watch for changes.

json2yaml

usage: json2yaml [-h] [-v] [-d DEPTH] [-i INDENTATION] [-s] [-r] [-w] input

Positional arguments:
  input                 JSON file or directory containing JSON files.

Optional arguments:
  -h, --help            Show this help message and exit.
  -v, --version         Show program's version number and exit.
  -d DEPTH, --depth DEPTH
                        Set minimum level of depth before generating inline 
                        YAML (default: 2).
  -i INDENTATION, --indentation INDENTATION
                        Number of space characters used to indent code 
                        (default: 2).
  -s, --save            Save output inside YML file(s) with the same name.
  -r, --recursive       If the input is a directory, also find JSON files in 
                        sub-directories recursively.
  -w, --watch           Watch for changes.

examples
``` bashyaml2json myfile.ymlyaml2json myfile.yml > output.jsonyaml2json myfile.yml --prettyyaml2json myfile.yml --pretty --saveyaml2json mydirectory --pretty --save --recursivejson2yaml myfile.json > output.ymljson2yaml myfile.json --depth 8json2yaml myfile.json --indentation 4json2yaml mydirectory --pretty --save --recursive