SonarCloud

OpenAPI Graph Extractor

Extracts and converts JSON data to RDF using an OpenAPI document and the JSON Schema embedded within it

This tool facilitates the semantic lifting of (optionally linked) structured data from a web service described by an OpenAPI document. In addition to capturing object structure and rich data type information (such as integer, date-time, etc.), the crux of the tool is in its ability to create linked data from services that use Linked Description Objects as defined by the JSON Hyper-Schema.

Setting up a new extraction target involves providing the OpenAPI document as a URL or a file and a configuration script, which provides arguments and hooks to be used during the extraction process. See examples .

Features

• Maps JSON Schema data types to XSD data types in RDF (e.g., date-time becomes xsd:dateTime)
• As a fallback, capable of mapping JSON primitive data types to XSD data types when not defined by schema (e.g., number can be configured to translate into xsd:integer or xsd:decimal depending on the value)
• Sweeps all GET methods that are available, providing path/query args supplied by config script
• Iteratively crawls all links discovered during processing by matching them to a paths item in the OpenAPI document
• Uses the $ref IDs when generating IRIs for the rdf:type object; creating human-readable class IRIs for all objects that are following best practices

Usage

Start by installing the dependencies with integrity checks

$ deno cache --reload --lock=deno.lock cli.ts

Now you can run the cli with restricted permissions

$ deno run \
    --lock=deno.lock \
    --no-prompt \
    --allow-env=EG_USERNAME,EG_PASSWORD,EG_ARG1,EG_ARG2 \
    --allow-read=.,/path/to/config-script.s \
    --allow-net=example.org \
    cli.ts \
        extract \
            /path/to/config-script.ts \
            https://example.org/open-api-doc.json \
   > output.ttl