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131 lines
3.4 KiB
131 lines
3.4 KiB
# fast-json-stable-stringify |
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Deterministic `JSON.stringify()` - a faster version of [@substack](https://github.com/substack)'s json-stable-strigify without [jsonify](https://github.com/substack/jsonify). |
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You can also pass in a custom comparison function. |
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[](https://travis-ci.org/epoberezkin/fast-json-stable-stringify) |
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[](https://coveralls.io/github/epoberezkin/fast-json-stable-stringify?branch=master) |
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# example |
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``` js |
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var stringify = require('fast-json-stable-stringify'); |
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var obj = { c: 8, b: [{z:6,y:5,x:4},7], a: 3 }; |
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console.log(stringify(obj)); |
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``` |
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output: |
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``` |
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{"a":3,"b":[{"x":4,"y":5,"z":6},7],"c":8} |
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``` |
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# methods |
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``` js |
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var stringify = require('fast-json-stable-stringify') |
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``` |
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## var str = stringify(obj, opts) |
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Return a deterministic stringified string `str` from the object `obj`. |
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## options |
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### cmp |
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If `opts` is given, you can supply an `opts.cmp` to have a custom comparison |
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function for object keys. Your function `opts.cmp` is called with these |
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parameters: |
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``` js |
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opts.cmp({ key: akey, value: avalue }, { key: bkey, value: bvalue }) |
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``` |
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For example, to sort on the object key names in reverse order you could write: |
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``` js |
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var stringify = require('fast-json-stable-stringify'); |
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var obj = { c: 8, b: [{z:6,y:5,x:4},7], a: 3 }; |
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var s = stringify(obj, function (a, b) { |
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return a.key < b.key ? 1 : -1; |
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}); |
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console.log(s); |
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``` |
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which results in the output string: |
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``` |
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{"c":8,"b":[{"z":6,"y":5,"x":4},7],"a":3} |
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``` |
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Or if you wanted to sort on the object values in reverse order, you could write: |
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``` |
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var stringify = require('fast-json-stable-stringify'); |
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var obj = { d: 6, c: 5, b: [{z:3,y:2,x:1},9], a: 10 }; |
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var s = stringify(obj, function (a, b) { |
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return a.value < b.value ? 1 : -1; |
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}); |
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console.log(s); |
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``` |
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which outputs: |
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``` |
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{"d":6,"c":5,"b":[{"z":3,"y":2,"x":1},9],"a":10} |
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``` |
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### cycles |
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Pass `true` in `opts.cycles` to stringify circular property as `__cycle__` - the result will not be a valid JSON string in this case. |
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TypeError will be thrown in case of circular object without this option. |
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# install |
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With [npm](https://npmjs.org) do: |
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``` |
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npm install fast-json-stable-stringify |
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``` |
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# benchmark |
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To run benchmark (requires Node.js 6+): |
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``` |
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node benchmark |
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``` |
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Results: |
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``` |
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fast-json-stable-stringify x 17,189 ops/sec ±1.43% (83 runs sampled) |
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json-stable-stringify x 13,634 ops/sec ±1.39% (85 runs sampled) |
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fast-stable-stringify x 20,212 ops/sec ±1.20% (84 runs sampled) |
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faster-stable-stringify x 15,549 ops/sec ±1.12% (84 runs sampled) |
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The fastest is fast-stable-stringify |
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``` |
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## Enterprise support |
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fast-json-stable-stringify package is a part of [Tidelift enterprise subscription](https://tidelift.com/subscription/pkg/npm-fast-json-stable-stringify?utm_source=npm-fast-json-stable-stringify&utm_medium=referral&utm_campaign=enterprise&utm_term=repo) - it provides a centralised commercial support to open-source software users, in addition to the support provided by software maintainers. |
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## Security contact |
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To report a security vulnerability, please use the |
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[Tidelift security contact](https://tidelift.com/security). |
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Tidelift will coordinate the fix and disclosure. Please do NOT report security vulnerability via GitHub issues. |
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# license |
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[MIT](https://github.com/epoberezkin/fast-json-stable-stringify/blob/master/LICENSE)
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