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README.md
JS-YAML - YAML 1.2 parser / writer for JavaScript
This is an implementation of YAML, a human friendly data serialization language. Started as PyYAML port, it was completely rewritten from scratch. Now it's very fast, and supports 1.2 spec.
Installation
YAML module for node.js
npm install js-yaml
CLI executable
If you want to inspect your YAML files from CLI, install js-yaml globally:
npm install -g js-yaml
Usage
usage: js-yaml [-h] [-v] [-c] [-t] file
Positional arguments:
file File with YAML document(s)
Optional arguments:
-h, --help Show this help message and exit.
-v, --version Show program's version number and exit.
-c, --compact Display errors in compact mode
-t, --trace Show stack trace on error
Bundled YAML library for browsers
<!-- esprima required only for !!js/function -->
<script src="esprima.js"></script>
<script src="js-yaml.min.js"></script>
<script type="text/javascript">
var doc = jsyaml.load('greeting: hello\nname: world');
</script>
Browser support was done mostly for online demo. If you find any errors - feel free to send pull requests with fixes. Also note, that IE and other old browsers needs es5-shims to operate.
Notes:
- We have no resources to support browserified version. Don't expect it to be well tested. Don't expect fast fixes if something goes wrong there.
!!js/function
in browser bundle will not work by default. If you really need it - loadesprima
parser first (via amd or directly).!!bin
in browser will returnArray
, because browsers do not support node.jsBuffer
and adding Buffer shims is completely useless on practice.
API
Here we cover the most 'useful' methods. If you need advanced details (creating your own tags), see wiki and examples for more info.
yaml = require('js-yaml');
fs = require('fs');
// Get document, or throw exception on error
try {
var doc = yaml.safeLoad(fs.readFileSync('/home/ixti/example.yml', 'utf8'));
console.log(doc);
} catch (e) {
console.log(e);
}
safeLoad (string [ , options ])
Recommended loading way. Parses string
as single YAML document. Returns a JavaScript
object or throws YAMLException
on error. By default, does not support regexps,
functions and undefined. This method is safe for untrusted data.
options:
filename
(default: null) - string to be used as a file path in error/warning messages.onWarning
(default: null) - function to call on warning messages. Loader will throw on warnings if this function is not provided.schema
(default:DEFAULT_SAFE_SCHEMA
) - specifies a schema to use.FAILSAFE_SCHEMA
- only strings, arrays and plain objects: http://www.yaml.org/spec/1.2/spec.html#id2802346JSON_SCHEMA
- all JSON-supported types: http://www.yaml.org/spec/1.2/spec.html#id2803231CORE_SCHEMA
- same asJSON_SCHEMA
: http://www.yaml.org/spec/1.2/spec.html#id2804923DEFAULT_SAFE_SCHEMA
- all supported YAML types, without unsafe ones (!!js/undefined
,!!js/regexp
and!!js/function
): http://yaml.org/type/DEFAULT_FULL_SCHEMA
- all supported YAML types.
json
(default: false) - compatibility with JSON.parse behaviour. If true, then duplicate keys in a mapping will override values rather than throwing an error.
NOTE: This function does not understand multi-document sources, it throws exception on those.
NOTE: JS-YAML does not support schema-specific tag resolution restrictions.
So, JSON schema is not as strict as defined in the YAML specification.
It allows numbers in any notation, use Null
and NULL
as null
, etc.
Core schema also has no such restrictions. It allows binary notation for integers.
load (string [ , options ])
Use with care with untrusted sources. The same as safeLoad()
but uses
DEFAULT_FULL_SCHEMA
by default - adds some JavaScript-specific types:
!!js/function
, !!js/regexp
and !!js/undefined
. For untrusted sources you
must additionally validate object structure, to avoid injections:
var untrusted_code = '"toString": !<tag:yaml.org,2002:js/function> "function (){very_evil_thing();}"';
// I'm just converting that string, what could possibly go wrong?
require('js-yaml').load(untrusted_code) + ''
safeLoadAll (string, iterator [ , options ])
Same as safeLoad()
, but understands multi-document sources and apply
iterator
to each document.
var yaml = require('js-yaml');
yaml.safeLoadAll(data, function (doc) {
console.log(doc);
});
loadAll (string, iterator [ , options ])
Same as safeLoadAll()
but uses DEFAULT_FULL_SCHEMA
by default.
safeDump (object [ , options ])
Serializes object
as YAML document. Uses DEFAULT_SAFE_SCHEMA
, so it will
throw exception if you try to dump regexps or functions. However, you can
disable exceptions by skipInvalid
option.
options:
indent
(default: 2) - indentation width to use (in spaces).skipInvalid
(default: false) - do not throw on invalid types (like function in the safe schema) and skip pairs and single values with such types.flowLevel
(default: -1) - specifies level of nesting, when to switch from block to flow style for collections. -1 means block style everwherestyles
- "tag" => "style" map. Each tag may have own set of styles.schema
(default:DEFAULT_SAFE_SCHEMA
) specifies a schema to use.sortKeys
(default:false
) - iftrue
, sort keys when dumping YAML. If a function, use the function to sort the keys.lineWidth
(default:80
) - set max line width.noRefs
(default:false
) - iftrue
, don't convert duplicate objects into referencesnoCompatMode
(default:false
) - iftrue
don't try to be compatible with older yaml versions. Currently: don't quote "yes", "no" and so on, as required for YAML 1.1
styles:
!!null
"canonical" => "~"
!!int
"binary" => "0b1", "0b101010", "0b1110001111010"
"octal" => "01", "052", "016172"
"decimal" => "1", "42", "7290"
"hexadecimal" => "0x1", "0x2A", "0x1C7A"
!!null, !!bool, !!float
"lowercase" => "null", "true", "false", ".nan", '.inf'
"uppercase" => "NULL", "TRUE", "FALSE", ".NAN", '.INF'
"camelcase" => "Null", "True", "False", ".NaN", '.Inf'
By default, !!int uses decimal
, and !!null, !!bool, !!float use lowercase
.
dump (object [ , options ])
Same as safeDump()
but without limits (uses DEFAULT_FULL_SCHEMA
by default).
Supported YAML types
The list of standard YAML tags and corresponding JavaScipt types. See also YAML tag discussion and YAML types repository.
!!null '' # null
!!bool 'yes' # bool
!!int '3...' # number
!!float '3.14...' # number
!!binary '...base64...' # buffer
!!timestamp 'YYYY-...' # date
!!omap [ ... ] # array of key-value pairs
!!pairs [ ... ] # array or array pairs
!!set { ... } # array of objects with given keys and null values
!!str '...' # string
!!seq [ ... ] # array
!!map { ... } # object
JavaScript-specific tags
!!js/regexp /pattern/gim # RegExp
!!js/undefined '' # Undefined
!!js/function 'function () {...}' # Function
Caveats
Note, that you use arrays or objects as key in JS-YAML. JS does not allow objects or array as keys, and stringifies (by calling .toString method) them at the moment of adding them.
---
? [ foo, bar ]
: - baz
? { foo: bar }
: - baz
- baz
{ "foo,bar": ["baz"], "[object Object]": ["baz", "baz"] }
Also, reading of properties on implicit block mapping keys is not supported yet. So, the following YAML document cannot be loaded.
&anchor foo:
foo: bar
*anchor: duplicate key
baz: bat
*anchor: duplicate key
Breaking changes in 2.x.x -> 3.x.x
If you have not used custom tags or loader classes and not loaded yaml
files via require()
- no changes needed. Just upgrade library.
Otherwise, you should:
- Replace all occurences of
require('xxxx.yml')
byfs.readFileSync()
+yaml.safeLoad()
. - rewrite your custom tags constructors and custom loader classes, to conform new API. See examples and wiki for details.
License
View the LICENSE file (MIT).