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----
-
-title: Encoding and decoding JavaScript BigInt values with reviver
-
-date: 2021-08-11
-
-updated_at: 2021-08-13
-
-layout: post
-
-lang: en
-
-ref: encoding-and-decoding-javascript-bigint-values-with-reviver
-
----
-
-`JSON.parse()` accepts a second parameter: a [`reviver()` function][reviver].
-It is a function that can be used to transform the `JSON` values as they're
-being parsed.
-
-[reviver]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse#using_the_reviver_parameter
-
-As it turns out, when combined with JavaScript's [`BigInt`] type, you can parse
-and encode JavaScript `BigInt` numbers via JSON:
-
-[`BigInt`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt
-
-```javascript
-const bigIntReviver = (_, value) =>
-	typeof value === "string" && value.match(/^-?[0-9]+n$/)
-		? BigInt(value.slice(0, value.length - 1))
-		: value;
-```
-
-I chose to interpret strings that contains only numbers and an ending `n` suffix
-as `BigInt` values, similar to how JavaScript interprets `123` (a number)
-differently from `123n` (a `bigint`);
-
-We do those checks before constructing the `BigInt` to avoid throwing needless
-exceptions and catching them on the parsing function, as this could easily
-become a bottleneck when parsing large JSON values.
-
-In order to do the full roundtrip, we now only need the `toJSON()` counterpart:
-
-```javascript
-BigInt.prototype.toJSON = function() {
-	return this.toString() + "n";
-};
-```
-
-With both `bigIntReviver` and `toJSON` defined, we can now successfully parse
-and encode JavaScript objects with `BigInt` values transparently:
-
-```javascript
-const s = `[
-	null,
-	true,
-	false,
-	-1,
-	3.14,
-	"a string",
-	{ "a-number": "-123" },
-	{ "a-bigint": "-123n" }
-]`;
-
-const parsed = JSON.parse(s, bigIntReviver);
-const s2 = JSON.stringify(parsed);
-
-console.log(parsed);
-console.log(s2);
-
-console.log(typeof parsed[6]["a-number"])
-console.log(typeof parsed[7]["a-bigint"])
-```
-
-The output of the above is:
-
-```
-[
-  null,
-  true,
-  false,
-  -1,
-  3.14,
-  'a string',
-  { 'a-number': '-123' },
-  { 'a-bigint': -123n }
-]
-[null,true,false,-1,3.14,"a string",{"a-number":"-123"},{"a-bigint":"-123n"}]
-string
-bigint
-```
-
-If you're on a web browser, you can probably try copying and pasting the above
-code on the console right now, as is.
-
-Even though [`JSON`] doesn't include `BigInt` number, encoding and decoding them
-as strings is quite trivial on JavaScript.
-
-[`JSON`]: https://datatracker.ietf.org/doc/html/rfc8259