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 - @govtechsg/open-certificate@2.0.9
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Open Certificate

This library supplies the schemas used for OpenCerts standards, in the form of json schemas


Using npm:

npm install @govtechsg/open-certificate


If you are writing a certificate issuer: you probably want to issue a certificate or issue multiple certificates

If you are writing a certificate verifier or viewer: you probably want to

  1. validate that a certificate is well-formed
  2. verify that a certificate has not been tampered with
  3. retrieve certificate contents
  4. obfuscate fields

Using OpenCerts

const openCert = require("@govtechsg/open-certificate")

const exampleCert = require("exampleCert.json") // reading an example certificate file

Validate Schema

This library comes with the schemas in the ./schema folder, all of them are loaded as valid schemas upon initialization.


Verifying Certificate Signature

Certificates are considered untampered-with if they have a valid signature field. Refer to the Open Attestation library for more details on this.


Issue a Certificate

A single Certificate can be issued using the .issueCertificate(certificate) method. Issuing a certificate in this manner will append a signature field to the certificate.

The return value of the method will be the signed certificate.

const issuedCert = openCert.issueCertificate(exampleCert)

Issue Multiple Certificates

Multiple Certificates can be issued at once with the .issueCertificates(certificate[]) method.

The return value of the method will be an array of signed certificates.

const exampleCerts = [cert1, cert2, cert3, ...]
const issuedCerts = openCert.issueCertificates(exampleCerts)

Retrieving Certificate contents

The raw certificate has salt in the fields to prevent enumeration, we provide a convenience method to retrieve the unsalted contents of the certificate using the method .certificateData(certificate)

const data = openCert.certificateData(exampleCert)

Obfuscating Fields in a Certificate

To obfuscate fields in a cert, the method .obfuscateFields(certificate, paths[]) is provided. The paths[] parameter is simply the JSON path for the fields to be obfuscated.

The method returns the obfuscated certificate.

const obfuscatedCert = openCert.obfuscateFields(exampleCert, [


The code is written to ES6 specs with stage-3 presets and is compiled by Babel.


npm run test


npm run build

Related Projects

Open Attestation Certificate Contract OpenCert Web UI

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