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o-son
Advanced tools
Readme
THIS LIBRARY HAS MOVED TO JSR. PLEASE IMPORT IT FROM HERE FROM NOW ON.
json has a bunch of problems.
oson fixes them.
// deno:
import * as oson from "https://deno.land/x/oson/mod.ts";
// node:
import * as oson from "o-son"; // npm install o-son
oson can encode circular references:
const obj = {};
obj.self = obj;
JSON.stringify(obj); // error
oson.stringify(obj); // works!
oson can encode repeated references:
const obj = {};
const arr = [obj, obj];
const [left, right] = JSON.parse(JSON.stringify(arr));
assertStrictEquals(left, right); // error
const [l, r] = oson.parse(oson.stringify(arr));
assertStrictEquals(l, r); // works!
oson can encode undefined:
const undef = oson.parse(oson.stringify(undefined));
assertStrictEquals(undef, undefined);
oson can encode sparse arrays:
const arr = [5, , , , 6, , , 7];
console.log(oson.parse(oson.stringify(arr)));
// [ 5, <3 empty items>, 6, <2 empty items>, 7 ]
oson can encode bigint:
const num = 10n ** 1000n;
JSON.stringify(num); // error
oson.stringify(num); // works!
oson can encode class instances of the following built-in types:
Map
Set
Date
RegExp
Error
Uint8Array
URL
oson can encode class instances of your custom classes:
class A {
constructor(public prop: string) {}
}
const serializer: ValueConstructor<A, string> = {
instance: A,
from: (a) => [a.prop],
create: ([prop]) => new A(prop),
};
GLOBAL_CONSTRUCTOR_MAP.set(A.name, serializer);
const a = new A("str");
assertInstanceOf(JSON.parse(JSON.stringify(a)), A); // error
assertInstanceOf(oson.parse(oson.stringify(a)), A); // works!
see also this type definition for classes that are containers for object values (which may lead to circular references).
oson provides listify
and delistify
which can be used to convert objects to a representation that JSON
accepts.
const num = 10n;
JSON.stringify(num); // error
JSON.stringify(oson.listify(num)); // works!
this lets you avoid repeated serialization.
the following things are explicitly not supported.
and they never will be, because they can never work well.
the oson in the name stands for oson structured object notation.
written from scratch, based on ideas in ARSON.
FAQs
oson structured object notation
The npm package o-son receives a total of 2,970 weekly downloads. As such, o-son popularity was classified as popular.
We found that o-son demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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