1 # json-stable-stringify
3 This is the same as https://github.com/substack/json-stable-stringify but it doesn't depend on libraries without licenses (jsonify).
5 deterministic version of `JSON.stringify()` so you can get a consistent hash
6 from stringified results
8 You can also pass in a custom comparison function.
10 [![browser support](https://ci.testling.com/substack/json-stable-stringify.png)](https://ci.testling.com/substack/json-stable-stringify)
12 [![build status](https://secure.travis-ci.org/substack/json-stable-stringify.png)](http://travis-ci.org/substack/json-stable-stringify)
17 var stringify = require('json-stable-stringify');
18 var obj = { c: 8, b: [{z:6,y:5,x:4},7], a: 3 };
19 console.log(stringify(obj));
25 {"a":3,"b":[{"x":4,"y":5,"z":6},7],"c":8}
31 var stringify = require('json-stable-stringify')
34 ## var str = stringify(obj, opts)
36 Return a deterministic stringified string `str` from the object `obj`.
42 If `opts` is given, you can supply an `opts.cmp` to have a custom comparison
43 function for object keys. Your function `opts.cmp` is called with these
47 opts.cmp({ key: akey, value: avalue }, { key: bkey, value: bvalue })
50 For example, to sort on the object key names in reverse order you could write:
53 var stringify = require('json-stable-stringify');
55 var obj = { c: 8, b: [{z:6,y:5,x:4},7], a: 3 };
56 var s = stringify(obj, function (a, b) {
57 return a.key < b.key ? 1 : -1;
62 which results in the output string:
65 {"c":8,"b":[{"z":6,"y":5,"x":4},7],"a":3}
68 Or if you wanted to sort on the object values in reverse order, you could write:
71 var stringify = require('json-stable-stringify');
73 var obj = { d: 6, c: 5, b: [{z:3,y:2,x:1},9], a: 10 };
74 var s = stringify(obj, function (a, b) {
75 return a.value < b.value ? 1 : -1;
83 {"d":6,"c":5,"b":[{"z":3,"y":2,"x":1},9],"a":10}
88 If you specify `opts.space`, it will indent the output for pretty-printing.
89 Valid values are strings (e.g. `{space: \t}`) or a number of spaces
95 var obj = { b: 1, a: { foo: 'bar', and: [1, 2, 3] } };
96 var s = stringify(obj, { space: ' ' });
118 The replacer parameter is a function `opts.replacer(key, value)` that behaves
119 the same as the replacer
120 [from the core JSON object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_native_JSON#The_replacer_parameter).
124 With [npm](https://npmjs.org) do:
127 npm install json-stable-stringify