Created
February 14, 2023 20:55
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JSON.stringify and JSON.parse with custom replacer and reviver
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| const someObj = { | |
| map: new Map([['uno', 1], ['dos', 2]]), | |
| set: new Set([1,2,3,4,5,5,6,7]), | |
| obj: { uno: 1, dos: 2 }, | |
| arr: [1,2,3,4,5,5,6,7], | |
| date: new Date('1991-12-15T00:00:00-0300'), | |
| dateISO: '1991-12-15T00:00:00-0300', | |
| map: new Map([['uno', new Map([['dos', 2]])]]), | |
| }; | |
| function replacer(key, value) { | |
| if (value instanceof Map) { | |
| return { | |
| __type: 'Map', | |
| value: [...value.entries()], | |
| }; | |
| } else if (value instanceof Set) { | |
| return { | |
| __type: 'Set', | |
| value: [...value.values()], | |
| }; | |
| } else if (this[key] instanceof Date) { | |
| return { | |
| __type: 'Date', | |
| value, | |
| }; | |
| } else { | |
| return value; | |
| } | |
| } | |
| function reviver(_, value) { | |
| if (value?.__type === 'Map') { | |
| return new Map(value.value); | |
| } else if (value?.__type === 'Set') { | |
| return new Set(value.value); | |
| } else if (value?.__type === 'Date') { | |
| return new Date(value.value); | |
| } else { | |
| return value; | |
| } | |
| } | |
| function pipeReplacers(replacers) { | |
| return function replacer(key, value) { | |
| return replacers.reduce((acc, replacerFn) => { | |
| return replacerFn.call(this, key, acc); | |
| }, value); | |
| } | |
| } | |
| function mapReplacer(_, value) { | |
| return !(value instanceof Map) | |
| ? value | |
| : { __type: 'Map', value: [...value.entries()] }; | |
| } | |
| function setReplacer(_, value) { | |
| return !(value instanceof Set) | |
| ? value | |
| : { __type: 'Set', value: [...value.values()] }; | |
| } | |
| function dateReplacer(key, value) { | |
| return !(this[key] instanceof Date) | |
| ? value | |
| : { __type: 'Date', value }; | |
| } | |
| const pipedReplacer = pipeReplacers([ | |
| mapReplacer, | |
| setReplacer, | |
| dateReplacer, | |
| ]); | |
| const someObjJson = JSON.stringify(someObj); | |
| const someObjJsonWithReplacer = JSON.stringify(someObj, pipedReplacer); | |
| console.log(someObjJson); | |
| console.log(someObjJsonWithReplacer); | |
| const someObjParsed = JSON.parse(someObjJsonWithReplacer); | |
| const someObjParsedWithReviver = JSON.parse(someObjJsonWithReplacer, reviver); | |
| console.log(someObjParsed); | |
| console.log(someObjParsedWithReviver); |
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