Playground

The place where you can create and play with WoT Thing Descriptions. Try it online at https://playground.thingweb.io/

Installation

There are different ways to use Playground:

• Install all packages and their dependencies via npm install in the root directory. This script calls lerna bootstrap.
• You can install the different packages from npm (see below) or in their respective directories.

Structure

The structure of all Playground packages is shown here:

All packages (except CLI and Web) are designed to be used as an imported package in a Node.js project or as a web bundle in a Web application. This allows them to be used in the Web package as part of a Web UI or inside the CLI.

• The core package provides a function to check whether a Thing Description (TD) is valid according to the W3C WoT Thing Description standard. It uses the official JSON Schema plus additional scripts for aspects that cannot be checked with a JSON Schema alone. Used together with the assertions package, it allows to check whether all of the features of the TD standard are present in a single TD or a group of TDs representing an implementation.

Both packages are used by the Web and CLI packages to provide their functionalities, plus IO functionalities through a UI.

Packages

The packages in this repository are available under (packages folder) or on NPM under @thing-description-playground/packageName.

Reusable packages:

• core: The core package provides a function to check whether a Thing Description (TD) is valid according to the W3C WoT Thing Description standard. It uses the official JSON Schema plus additional scripts for aspects that cannot be checked with a JSON Schema alone. It generates a JSON report of the validation results. NPM.
• assertions: The assertions package allows to check whether all of the features of the TD standard are present in a single TD or a group of TDs representing an implementation. It needs to be used together with the core package since some features are detected by the core package. NPM.
• defaults: The defaults package can be used to add or remove explicitly stated default values in a TD. It has no dependency to other playground packages. NPM.
• td_to_openAPI: The Open API package allows to create an Open API instance from a Thing Description which has HTTP in the forms. It has no dependency to other playground packages.NPM.
• td_to_asyncAPI: The Async API package allows to create an Async API instance from a Thing Description which has MQTT in the forms. It only depends on the defaults package to add defaults to a TD before generating the Async API instance. NPM.
• json-spell-checker: The JSON Spell Checker package allows to find spelling mistakes (e.g. action instead of actions) in a JSON document according to its JSON Schema. Such JSON documents could be TDs, Open API specs etc. NPM.

End Product Packages:

• cli: The CLI package wraps the above packages in a way they can be used from the command line. Additionally, it allows the functionalities of the other packages to be executed on a set of TDs. NPM.
• web: The Web package wraps the above packages in a way they can be used from a browser interface. You can host/adapt your own browser version of the playground. It is online at https://playground.thingweb.io/NPM.

Examples

Examples are included in the core and in the examples folder at the root of the project.

Browser-based Thing Description Validation

• Online: It is hosted here

  • Simply paste a TD in the text field and click validate
  • Safari browser has unexpected behavior with JSON-LD documents
  • If you lose your internet connection when validating JSON-LD validation will fail since it tries to access the documents under @context (can be turned off)

• Offline/OnPremise: by hosting the web yourself. Therefore, please deliver the "index.html" file with a web-server.

Batch Testing

Please have a look at the cli package for batch testing of Thing Descriptions.

Script-based Assertion Tester

Please have a look at the cli package for script-based assertion testing, or at the assertions package, if you're planning to integrate the assertion testing as a dependency in your own NPM modules.

Script-based Thing Description Validation

Please have a look at the cli package for script-based TD validation, or at the core package, if you're planning to integrate the TD validation as a dependency in your own NPM modules.

License

All packages are licensed under the Eclipse Public License v. 2.0. You find a copy of the License here.

Publish a new version

1. Run lerna bootstrap to install dependencies among the packages, even if a package has never been published before. Make sure you have not increased the dependency versions yet, e.g., you have a new package newExample and the oldExample depends on it. The newExample is on version 0.0.0 (since you want to publish it as 1.0.0) then in the oldExample package.json the dependency has to be on the same version (or lower) so "dependencies" { newExample: "^0.0.0"}}. Otherwise lerna will not accept linking the local newExample.
2. If lerna bootstrap was successful you can now bump dependency versions (if required), e.g., you could now do "dependencies" { newExample: "^1.0.0"}} in the oldExample package.json.
3. Run lerna publish to publish all the new package versions. Lerna will then ask for every changed package whether it received a patch, minor or major update. In our example, you should now select major for the newExample so that it will be published as 1.0.0 version. You should log in to npm via npm login before doing this.

Adapting Licenses

One can use the VS Code plugin at https://marketplace.visualstudio.com/items?itemName=angelo-breuer.license-header-manager to updating the copyright fields on top of each file.