JBJ JSON-LD module

JBJ JSON-LD is a JBJ module aiming to facilitate the generation of JSON-LD from JSON.

It can also be used in combination with JBJ-RDFa.

Contributors

• François Parmentier

Installation

$ npm install jbj-jsonld

Usage

This JBJ module cannot be used alone. JBJ has to be installed.

var JBJ = require('jbj');
JBJ.use(require('jbj-jsonld'));

Tests

Use mocha to run the tests.

$ npm install
$ npm test

Actions

Once the module is declared as used for JBJ, you can use the following actions:

<a id="context"

context: { field: {scheme, type} }

Add a context in the result.

Warning: the context is required to use the jsonld action.

Example 1: generate a valid JSON-LD @context.

{
    "input": {
    },
    "stylesheet": {
        "context": {
            "title": {
                "scheme": "http://purl.org/dc/terms/title",
                "type": "https://www.w3.org/TR/xmlschema-2/#string"
            }
        }
    },
    "expected": {
        "@context": {
            "title": {
                "@id": "http://purl.org/dc/terms/title",
                "@type": "https://www.w3.org/TR/xmlschema-2/#string"
            }
        }
    }
}

Example 2: Generate a compacted JSON-LD from input

{
    "input": {
        "title": "An example of string value"
    },
    "stylesheet": {
        "context": {
            "title": {
                "scheme": "http://purl.org/dc/terms/title",
                "type": "https://www.w3.org/TR/xmlschema-2/#string"
            }
        },
        "jsonld": "compacted"
    },
    "expected": {
        "@context": {
            "title": {
                "@id": "http://purl.org/dc/terms/title",
                "@type": "https://www.w3.org/TR/xmlschema-2/#string"
            }
        },
        "title": "An example of string value"
    }
}

jsonld: mode

Generate a JSON-LD from an input containing a JSON-LD context (see context), in various modes:

• compacted (default)
• flattened
• expanded

Example 1: Remove non-terminal properties from JSON-LD (here, the field part)

{
    "input": {
        "field": "value"
    },
    "stylesheet": {
        "$title": {
            "get": "field",
            "capitalize": true
        },
        "context": {
            "title": {
                "scheme": "http://purl.org/dc/terms/title",
                "type": "https://www.w3.org/TR/xmlschema-2/#string"
            }
        },
        "jsonld": "compacted"
    },
    "expected": {
        "@context": {
            "title": {
                "@id": "http://purl.org/dc/terms/title",
                "@type": "https://www.w3.org/TR/xmlschema-2/#string"
            }
        },
        "title": "Value"
    }
}

Example 2: expanded JSON-LD

{
    "input": {
        "@context": {
            "access": {
              "@id": "https://schema.org/isAccessibleForFree",
              "@type": "https://www.w3.org/TR/xmlschema-2/#boolean"
            }
        },
        "access": true
    },
    "stylesheet": {
        "jsonld": "expanded"
    },
    "expected": [
        {
            "https://schema.org/isAccessibleForFree": [
                {
                "@type": "https://www.w3.org/TR/xmlschema-2/#boolean",
                "@value": true
                }
            ]
        }
    ]
}

Example 3: flattened JSON-LD

{
        "input": {
            "@context": {
                "access": {
                  "@id": "https://schema.org/isAccessibleForFree",
                  "@type": "https://www.w3.org/TR/xmlschema-2/#boolean"
                }
            },
            "access": true
        },
        "stylesheet": {
            "jsonld": "flattened"
        },
        "expected": [{
            "@id": "_:b0",
            "https://schema.org/isAccessibleForFree": [{
                "@type": "https://www.w3.org/TR/xmlschema-2/#boolean",
                "@value": true
            }]
        }]
    }

Examples

See unit tests : https://github.com/Inist-CNRS/node-jbj-jsonld/tree/master/test

Try it

http://Inist-CNRS.github.io/jbj-playground/

(don't forget to click on JSON-LD button -- when it will exist)

License

MIT