![]() ![]() This library doesn’t know about BigInt or LosslessNumber types and will not stringify these data types correctly. For example, JSON Editor Online supports exporting your JSON data to CSV, and uses the excellent json2csv library for this. Having data with BigInt values or LosslessNumbers most likely gives issues with third party libraries that are not aware of those data types. As soon as you introduce BigInt values or LosslessNumbers, all operations that you want to execute will need to support these types of values. For example in JSON Editor Online, you can edit the values, transform the document (query, filter, sort, etc), compare two documents, or validate a document against a JSON schema. Render the data on screen, verify it, compare it, sort it, etc. It depends a bit on what you want to do with the data after parsing it, but normally, you want to do something with it. ![]() So, comparing the native JSON.parse function and lossless-json, you get the following:ĭoes using the LosslessJSON parser solve all issues? You can choose whether you want to throw an exception when numeric information is lost, or silently ignore certain classes of information loss. Maybe you want to convert long numeric values into BigInt, or pass values into some BigNumber library. The library allows you to pass your own number parser, so you can apply your own strategy to deal with numeric values. When operating on it, the LosslessNumber will be converted into either a Number or BigInt, or an error will be thrown when it is unsafe to do so. This preserves any value, and even preserves the formatting like the trailing zero in the value 4.0. It takes a more flexible and powerful approach than the JSON BigInt solutions.īy default, lossless-json parses numbers into a lightweight LosslessNumber class, which holds the numeric value as a string. The lossless-json library was developed specially for JSON Editor Online. Most of these libraries take a pragmatic approach, and parse long numbers straight into JavaScript’s relatively new BigInt data type. There are various excellent solutions for this available: lossless-json, json-bigint, js-json-bigint, or json-source-map. To solve this issue, you simply can’t use the built-in JSON.parse and you’ll have to use a different JSON parser instead. So by then, it is already too late and the value will be corrupted already. The problem though is that first the text is parsed into a number, and next, it is passed to the reviver. Like most web based JSON editors, it did also use the native JSON.parse function and regular JavaScript Numbers under the hood, so it suffered from the limitations explained above.Ī first thought may be: wait, but JSON.parse has an optional reviver argument, allowing you to parse content in a different way. This issue of parsing large numbers in JavaScript has been a recurring request from users of over the years. How can I prevent numbers from being corrupted by JSON.parse? ![]()
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