node.js - 有没有正确的方法来解析大量的 JSON?(长，bigint，int64) [英] node.js - Is there any proper way to parse JSON with large numbers? (long, bigint, int64)

问题描述

当我解析这一小块 JSON 时:

When I parse this little piece of JSON:

{ "value" : 9223372036854775807 }

这是我得到的:

{ hello: 9223372036854776000 } 

有什么办法可以正确解析吗?

Is there any way to parse it properly?

推荐答案

不适用于内置 JSON.parse.您需要手动解析它并将值视为字符串(如果您想对它们进行算术运算，则有 bignumber.js) 您可以使用 Douglas Crockford JSON.js 库作为您的基础解析器.

Not with built-in JSON.parse. You'll need to parse it manually and treat values as string (if you want to do arithmetics with them there is bignumber.js) You can use Douglas Crockford JSON.js library as a base for your parser.

EDIT2(原始答案后 7 年)-使用标准 JSON api 可能很快就能解决这个问题.看看这个 TC39 提案，将源字符串的访问权限添加到 reviver 函数 - https://github.com/tc39/proposal-json-parse-with-source

EDIT2 ( 7 years after original answer ) - it might soon be possible to solve this using standard JSON api. Have a look at this TC39 proposal to add access to source string to a reviver function - https://github.com/tc39/proposal-json-parse-with-source

我为你创建了一个 package :)

I created a package for you :)

var JSONbig = require('json-bigint');

var json = '{ "value" : 9223372036854775807, "v2": 123 }';
console.log('Input:', json);
console.log('');

console.log('node.js bult-in JSON:')
var r = JSON.parse(json);
console.log('JSON.parse(input).value : ', r.value.toString());
console.log('JSON.stringify(JSON.parse(input)):', JSON.stringify(r));

console.log('

big number JSON:');
var r1 = JSONbig.parse(json);
console.log('JSON.parse(input).value : ', r1.value.toString());
console.log('JSON.stringify(JSON.parse(input)):', JSONbig.stringify(r1));

输出:

Input: { "value" : 9223372036854775807, "v2": 123 }

node.js bult-in JSON:
JSON.parse(input).value :  9223372036854776000
JSON.stringify(JSON.parse(input)): {"value":9223372036854776000,"v2":123}


big number JSON:
JSON.parse(input).value :  9223372036854775807
JSON.stringify(JSON.parse(input)): {"value":9223372036854775807,"v2":123}

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