Jelly Schema

Provides facilities to:

• transform Jelly Schema into the JSON Schema & UI Schema objects with custom extensions
• parse Jelly Schema
• validate JSON data against Jelly Schema

Current crate status is experimental.

Goal

jellyschema crate is one small piece of the balena.io configuration project. This project has no public / open specification yet, but we're working on it and it will be public once finished.

Supported platforms

This library is written in the Rust language and can be used:

• directly, as a Rust crate
• as an isomorphic NPM package (NodeJS & browser)

Documentation

• API documentation
• Changelog
• Maintainer documentation

Usage

Rust

Add as a dependency to your Cargo.toml:

[dependencies]
jellyschema = "0"

Evaluate simple JSON:

let input_schema: serde_yaml::Value = serde_yaml::from_str(
    include_str!("configuration.yml")).
    unwrap();

let (json_schema, ui_object) = Generator::with(input_schema)?.generate();

Javascript

Install via npm

npm install --save jellyschema

Generate simple JSON Schema & UI Object Schema:

const jellyschema = require('jellyschema');

const initialValue = `
title: demo
version: 1
properties:
  - network:
      title: Network
      properties:
        - ssid:
            title: Network SSID
            type: string
            minLength: 1
            maxLength: 32
        - passphrase:
            title: Network Key
            type: password
            minLength: 8
`;

var schema = new jels.JellySchema(initialValue);
const result = schema.jsonAndUiSchema();
console.log(JSON.stringify(result, null, 2));

console.log(schema.validate({network: { ssid: 'foo', passphrase: 123 }}));
console.log(schema.errors());

An example of using this module in nodeJS is available in the examples/node folder:

cd examples/node
npm install
npm start

An example of using this module in the browser is available in the examples/browser folder:

cd examples/browser
npm install
npm start

Open localhost:8080 in your browser.

Support

If you're having any problem, please raise an issue on GitHub or contact us, and the balena.io team will be happy to help.

License

jellyschema is open source software, and may be redistributed under the terms specified in the license.