@dashevo/dash-schema

v3.0.0-alpha.3

Published

3 years ago

[![NPM](https://nodei.co/npm/dash-schema.png?downloads=true)](https://nodei.co/npm/dash-schema/)

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Dash Schema

A consensus-code library for validating Dash Schema instances against System and DAP Schema definitions within the Dash protocol.

Getting Started

Ensure you have the latest NodeJS installed.

Clone the repo:

git clone https://github.com/dashevo/dash-schema && cd dash-schema

Install npm packages:

npm install

Run tests:

npm test

Build docs, browser bundle and run all tests:

npm run build

Usage

Install the library as a Node module.

$ npm install --save @dashevo/dash-schema

Reference the library within a Node module.

let Schema = require('dash-schema');

// validate the System schema
let valid = Schema.validate.sysschema(Schema.System);
console.log(valid.valid));
// -> true

Include the browserified library in your HTML.

<html>
<head>
  <script src='./dist/dash-schema.js'></script>
  <script>
    let Schema = require('dash-schema');

    // validate the System schema
    let valid = Schema.validate.sysschema(Schema.System);
    console.log(valid.valid));
    // -> true

  </script>
</head>
<body></body>
</html>

Validation Results

Dash Schema validation has a standardized format for reporting the results of Schema instance validation and any errors occurring within that validation.

Exception stratgy

Exceptions are thrown when usage of the library is incorrect, such as missing or null expected parameters
Exceptions are not thrown when library usage is correct but schema instance data is invalid according to schema definitions. In this case a validation result is returned containing the validation error in question

ValidationResult object

{
    valid: { boolean }
    errCode: { number } Error code
    errMsg: { string } Error message
    objData: { object } The object being validated
    objType: { string } Name of the object subschema
    rootSchema: { object } Definition of the root Schema used to validate this object
}

valid is a boolean value that is true when validation succeeded and false when validation failed
error an object {} when validation succeeded or a ValidationError object when validation failed

The error object always exists, either as an empty object {} or a ValidationObject. Therefore it is not sufficient to check for the existance of the error object in a ValidationResult. Instead, positive confirmation must be obtained by checking that the .valid property === true, to avoid situations where a bug returned null from some validation code.

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