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1 # json-stable-stringify
2
3 deterministic version of `JSON.stringify()` so you can get a consistent hash
4 from stringified results
5
6 You can also pass in a custom comparison function.
7
8 [![browser support](https://ci.testling.com/substack/json-stable-stringify.png)](https://ci.testling.com/substack/json-stable-stringify)
9
10 [![build status](https://secure.travis-ci.org/substack/json-stable-stringify.png)](http://travis-ci.org/substack/json-stable-stringify)
11
12 # example
13
14 ``` js
15 var stringify = require('json-stable-stringify');
16 var obj = { c: 8, b: [{z:6,y:5,x:4},7], a: 3 };
17 console.log(stringify(obj));
18 ```
19
20 output:
21
22 ```
23 {"a":3,"b":[{"x":4,"y":5,"z":6},7],"c":8}
24 ```
25
26 # methods
27
28 ``` js
29 var stringify = require('json-stable-stringify')
30 ```
31
32 ## var str = stringify(obj, opts)
33
34 Return a deterministic stringified string `str` from the object `obj`.
35
36 ## options
37
38 ### cmp
39
40 If `opts` is given, you can supply an `opts.cmp` to have a custom comparison
41 function for object keys. Your function `opts.cmp` is called with these
42 parameters:
43
44 ``` js
45 opts.cmp({ key: akey, value: avalue }, { key: bkey, value: bvalue })
46 ```
47
48 For example, to sort on the object key names in reverse order you could write:
49
50 ``` js
51 var stringify = require('json-stable-stringify');
52
53 var obj = { c: 8, b: [{z:6,y:5,x:4},7], a: 3 };
54 var s = stringify(obj, function (a, b) {
55 return a.key < b.key ? 1 : -1;
56 });
57 console.log(s);
58 ```
59
60 which results in the output string:
61
62 ```
63 {"c":8,"b":[{"z":6,"y":5,"x":4},7],"a":3}
64 ```
65
66 Or if you wanted to sort on the object values in reverse order, you could write:
67
68 ```
69 var stringify = require('json-stable-stringify');
70
71 var obj = { d: 6, c: 5, b: [{z:3,y:2,x:1},9], a: 10 };
72 var s = stringify(obj, function (a, b) {
73 return a.value < b.value ? 1 : -1;
74 });
75 console.log(s);
76 ```
77
78 which outputs:
79
80 ```
81 {"d":6,"c":5,"b":[{"z":3,"y":2,"x":1},9],"a":10}
82 ```
83
84 ### space
85
86 If you specify `opts.space`, it will indent the output for pretty-printing.
87 Valid values are strings (e.g. `{space: \t}`) or a number of spaces
88 (`{space: 3}`).
89
90 For example:
91
92 ```js
93 var obj = { b: 1, a: { foo: 'bar', and: [1, 2, 3] } };
94 var s = stringify(obj, { space: ' ' });
95 console.log(s);
96 ```
97
98 which outputs:
99
100 ```
101 {
102 "a": {
103 "and": [
104 1,
105 2,
106 3
107 ],
108 "foo": "bar"
109 },
110 "b": 1
111 }
112 ```
113
114 # install
115
116 With [npm](https://npmjs.org) do:
117
118 ```
119 npm install json-stable-stringify
120 ```
121
122 # license
123
124 MIT