JSKOS Validation

Validation for JSKOS data.

This repository contains tools for validating JSKOS data.

Table of Contents

• Install
• Usage
  • unknownFields
  • schemes
  • knownSchemes
  • rememberSchemes
  • errors and errorMessages
  • version
• Maintainers
• Contributing
• License

Install

You will unlikely need to directly install jskos-validate. Better use a client such as jskos-cli instead!

Install as dependency to your node project (requires at least NodeJS 18):

npm install --save jskos-validate

Or clone the current version for development:

git clone --recursive https://github.com/gbv/jskos-validate.git
cd jskos-validate
npm install

Usage

This module provides validation methods for each JSKOS object type based on JSON Schemas and additional constraints.

const validate = require("jskos-validate")

let concept = { ... }
validate.concept(concept) // returns true or false
validate(concept)         // same if concept contains type field

let mapping = { ... }
validate.mapping(mapping) // returns true or false
validate(mapping)         // same if mapping contains type field

// ...

See npm module jskos-cli for a command line interface to JSKOS validation.

unknownFields

Setting the option unknownFields to a truthy value will not complain about additional fields. This is useful for instance to validate JSKOS data with newly introduced fields with an old schema.

const validate = require("jskos-validate")

validate(data, { unknownFields: true })

schemes

Option schemes can be set to an array of JSKOS Concept Schemes to be looked up by their URI in field inScheme of a concept. Scheme fields namespace, uriPattern and notationPattern are used for validation (unless these fields included in the inScheme).

knownSchemes

Works like option schemes but enforces concepts to be inScheme of one of the given vocabularies.

rememberSchemes

Works like option schemes but successfully validated vocabularies are added to the list array of Concept Schemes (overriding vocabularies with same URI).

const schemes = []
validate.scheme(aScheme, { rememberSchemes: schemes })
validate.concept(aConcept, { schemes }) // includes aScheme for validation

This option is ignored if knownSchemes is set because in this case the set of vocabularies is fixed.

errors and errorMessages

Property errors and errorMessages of the validation function contain errors in detailled format and as array of error message strings, respectively.

const validate = require("jskos-validate")

if (!validate.concept(data)) {
  validate.concept.errorMessages.forEach(console.error)
}

if (!validate(data)) {
  validate.errorMessages.forEach(console.error)
}

version

Returns the version of JSKOS specification that is used for validation.

validate.version // 0.5.0

Maintainers

• @stefandesu
• @nichtich

Contributing

Please use GitHub issues for bug reports, feature requests or questions.

Maintainers only: To publish a new version on npm via GitHub Actions:

npm run release:patch # or minor, or major

License

MIT © 2019 Verbundzentrale des GBV (VZG)