element-templates-validator

Validate element templates based on JSON Schema.

Installation

npm i --save @bpmn-io/element-templates-validator

Usage

Given an example element template:

import { validate } from '@bpmn-io/element-templates-validator';

import sample from './test/fixtures/rpa-broken.json';

const {
  valid,
  errors
} = validate(sample);

if (!valid) {
  console.error('Invalid JSON detected:', errors);
}

This will print detailed information about errors inside the sample:

[
  {
    "keyword": "type",
    "dataPath": "",
    "schemaPath": "#/type",
    "params": {
      "type": "object"
    },
    "message": "must be object",
    "dataPointer": {
      "value": {
        "line": 0,
        "column": 0,
        "pos": 0
      },
      "valueEnd": {
        "line": 177,
        "column": 1,
        "pos": 4825
      }
    }
  }
  ...
]

You can also pass a stringified template to ensure that the dataPointers of the errors reflect the correct position in the original string.

import { validate } from '@bpmn-io/element-templates-validator';

import { readFileSync } from 'node:fs';

const sample = readFileSync('./test/fixtures/rpa-broken.json', 'utf-8');

const {
  valid,
  errors
} = validate(sample);

if (!valid) {
  console.error('Invalid JSON detected:', errors);
}

If a parsed JSON object is passed, the dataPointers will assume that the source template is formatted with JSON.stringify(template, null, 2).

It's also possible to validate multiple objects at once. In this case, the list of templates supports only objects, not strings.

import { validateAll } from '@bpmn-io/element-templates-validator';

import samples from './test/fixtures/multiple-errors.json';

const {
  valid,
  results
} = validateAll(samples);

if (!valid) {
  console.error('Invalid JSON objects detected:', results.filter(r => !r.valid));
}

License

MIT