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README.md
@peculiar/asn1-schema
Decorators and helper APIs for declaring ASN.1 schemas in TypeScript.
This is the core package used by the schema modules in this repository. It lets you describe DER structures with decorators and convert them with AsnConvert, AsnParser, and AsnSerializer.
Installation
npm install @peculiar/asn1-schema
Overview
Abstract Syntax Notation One (ASN.1) is widely used across X.509, PKCS, CMS, OCSP, and related standards. This package keeps those mappings declarative and type-friendly by attaching schema metadata directly to classes.
TypeScript Example
import { AsnConvert, AsnProp, AsnPropTypes, AsnType, AsnTypeTypes } from "@peculiar/asn1-schema";
@AsnType({ type: AsnTypeTypes.Sequence })
class BasicConstraints {
@AsnProp({ type: AsnPropTypes.Boolean, defaultValue: false })
public cA = false;
}
const basicConstraints = new BasicConstraints();
basicConstraints.cA = true;
const encoded = AsnConvert.serialize(basicConstraints);
const decoded = AsnConvert.parse(encoded, BasicConstraints);
console.log(decoded.cA);