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# object-hash

Generate hashes from objects and values in node and the browser.  Uses node.js
crypto module for hashing.  Supports SHA1 and many others (depending on the platform)
as well as custom streams (e.g. CRC32).

[![NPM](https://nodei.co/npm/object-hash.png?downloads=true&downloadRank=true)](https://www.npmjs.com/package/object-hash)

[![Travis CI](https://secure.travis-ci.org/puleos/object-hash.png?branch=master)](https://secure.travis-ci.org/puleos/object-hash?branch=master)
[![Coverage Status](https://coveralls.io/repos/puleos/object-hash/badge.svg?branch=master&service=github)](https://coveralls.io/github/puleos/object-hash?branch=master)

* Hash values of any type.
* Supports a keys only option for grouping similar objects with different values.

```js
var hash = require('object-hash');

hash({foo: 'bar'}) // => '67b69634f9880a282c14a0f0cb7ba20cf5d677e9'
hash([1, 2, 2.718, 3.14159]) // => '136b9b88375971dff9f1af09d7356e3e04281951'
```

## Versioning Disclaimer

Starting with version `1.1.8` (released April 2017), new versions will consider
the exact returned hash part of the API contract, i.e. changes that will affect
hash values will be considered `semver-major`. Previous versions may violate
that expectation.

For more information, see [this discussion](https://github.com/puleos/object-hash/issues/30).

## hash(value, options);
Generate a hash from any object or type.  Defaults to sha1 with hex encoding.
*  `algorithm` hash algo to be used: 'sha1', 'md5', 'passthrough'. default: sha1
  *  This supports the algorithms returned by `crypto.getHashes()`. Note that the default of SHA-1 is not considered secure, and a stronger algorithm should be used if a cryptographical hash is desired.
  * This also supports the `passthrough` algorith, which will return the information that would otherwise have been hashed.
*  `excludeValues` {true|false} hash object keys, values ignored. default: false
*  `encoding` hash encoding, supports 'buffer', 'hex', 'binary', 'base64'. default: hex
*  `ignoreUnknown` {true|*false} ignore unknown object types. default: false
*  `replacer` optional function that replaces values before hashing. default: accept all values
*  `respectFunctionProperties` {true|false} Whether properties on functions are considered when hashing. default: true
*  `respectFunctionNames` {true|false} consider `name` property of functions for hashing. default: true
*  `respectType` {true|false} Whether special type attributes (`.prototype`, `.__proto__`, `.constructor`)
   are hashed. default: true
*  `unorderedArrays` {true|false} Sort all arrays using before hashing. Note that this affects *all* collections,
   i.e. including typed arrays, Sets, Maps, etc. default: false
*  `unorderedSets` {true|false} Sort `Set` and `Map` instances before hashing, i.e. make
   `hash(new Set([1, 2])) == hash(new Set([2, 1]))` return `true`. default: true
*  `unorderedObjects` {true|false} Sort objects before hashing, i.e. make `hash({ x: 1, y: 2 }) === hash({ y: 2, x: 1 })`. default: true
*  `excludeKeys` optional function for exclude specific key(s) from hashing, if returns true then exclude from hash. default: include all keys

## hash.sha1(value);
Hash using the sha1 algorithm.

Note that SHA-1 is not considered secure, and a stronger algorithm should be used if a cryptographical hash is desired.

*Sugar method, equivalent to hash(value, {algorithm: 'sha1'})*

## hash.keys(value);
Hash object keys using the sha1 algorithm, values ignored.

*Sugar method, equivalent to hash(value, {excludeValues: true})*

## hash.MD5(value);
Hash using the md5 algorithm.

Note that the MD5 is not considered secure, and a stronger algorithm should be used if a cryptographical hash is desired.

*Sugar method, equivalent to hash(value, {algorithm: 'md5'})*

## hash.keysMD5(value);
Hash object keys using the md5 algorithm, values ignored.

Note that the MD5 is not considered secure, and a stronger algorithm should be used if a cryptographical hash is desired.

*Sugar method, equivalent to hash(value, {algorithm: 'md5', excludeValues: true})*

## hash.writeToStream(value, [options,] stream):
Write the information that would otherwise have been hashed to a stream, e.g.:
```js
hash.writeToStream({foo: 'bar', a: 42}, {respectType: false}, process.stdout)
// => e.g. 'object:a:number:42foo:string:bar'
```

## Installation

node:
```js
npm install object-hash
```

browser: */dist/object_hash.js*
```
<script src="object_hash.js" type="text/javascript"></script>

<script>
  var hash = objectHash.sha1({foo:'bar'});

  console.log(hash); // e003c89cdf35cdf46d8239b4692436364b7259f9
</script>
```

## Example usage
```js
var hash = require('object-hash');

var peter = {name: 'Peter', stapler: false, friends: ['Joanna', 'Michael', 'Samir'] };
var michael = {name: 'Michael', stapler: false, friends: ['Peter', 'Samir'] };
var bob = {name: 'Bob', stapler: true, friends: [] };

/***
 * sha1 hex encoding (default)
 */
hash(peter);
// 14fa461bf4b98155e82adc86532938553b4d33a9
hash(michael);
// 4b2b30e27699979ce46714253bc2213010db039c
hash(bob);
// 38d96106bc8ef3d8bd369b99bb6972702c9826d5

/***
 * hash object keys, values ignored
 */
hash(peter, { excludeValues: true });
// 48f370a772c7496f6c9d2e6d92e920c87dd00a5c
hash(michael, { excludeValues: true });
// 48f370a772c7496f6c9d2e6d92e920c87dd00a5c
hash.keys(bob);
// 48f370a772c7496f6c9d2e6d92e920c87dd00a5c

/***
 * hash object, ignore specific key(s)
 */
hash(peter, { excludeKeys: function(key) {
    if ( key === 'friends') {
      return true;
    }
    return false;
  }
});
// 66b7d7e64871aa9fda1bdc8e88a28df797648d80

/***
 * md5 base64 encoding
 */
hash(peter, { algorithm: 'md5', encoding: 'base64' });
// 6rkWaaDiG3NynWw4svGH7g==
hash(michael, { algorithm: 'md5', encoding: 'base64' });
// djXaWpuWVJeOF8Sb6SFFNg==
hash(bob, { algorithm: 'md5', encoding: 'base64' });
// lFzkw/IJ8/12jZI0rQeS3w==
```

## Legacy Browser Support
IE <= 8 and Opera <= 11 support dropped in version 0.3.0.  If you require
legacy browser support you must either use an ES5 shim or use version 0.2.5
of this module.

## Development

```
git clone https://github.com/puleos/object-hash
```

## Node Docker Wrapper

If you want to stand this up in a docker container, you should take at look
at the [![node-object-hash](https://github.com/bean5/node-object-hash)](https://github.com/bean5/node-object-hash) project.

### gulp tasks
* `gulp watch` (default) watch files, test and lint on change/add
* `gulp test` unit tests
* `gulp karma` browser unit tests
* `gulp lint` jshint
* `gulp dist` create browser version in /dist

## License
MIT

## Changelog

### v2.0.0

Only Node.js versions `>= 6.0.0` are being tested in CI now.
No other breaking changes were introduced.
Youez - 2016 - github.com/yon3zu
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