JSON schema test

output.sh

/*** Validating ***/
{ a: 'some' }
strict mode: missing type "string" for keyword "pattern" at "#/if/properties/a" (strictTypes)
/*** Validating ***/
{ b: 'other' }
ValidationError: validation failed
    at validate (/Users/rhys.evans/Projects/or/treecreeper/packages/tc-schema-validator/validation/ajv-test.js:28:15)
    at Object.<anonymous> (/Users/rhys.evans/Projects/or/treecreeper/packages/tc-schema-validator/validation/ajv-test.js:33:1)
    at Module._compile (internal/modules/cjs/loader.js:959:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:995:10)
    at Module.load (internal/modules/cjs/loader.js:815:32)
    at Function.Module._load (internal/modules/cjs/loader.js:727:14)
    at Function.Module.runMain (internal/modules/cjs/loader.js:1047:10)
    at internal/main/run_main_module.js:17:11 {
  errors: [
    {
      keyword: 'additionalProperties',
      dataPath: '',
      schemaPath: '#/additionalProperties',
      params: { additionalProperty: 'b' },
      message: 'should NOT have additional properties'
    }
  ],
  validation: true,
  ajv: true
}
/*** Validating ***/
{ a: 'some', b: 'other' }
ValidationError: validation failed
    at validate (/Users/rhys.evans/Projects/or/treecreeper/packages/tc-schema-validator/validation/ajv-test.js:28:15)
    at Object.<anonymous> (/Users/rhys.evans/Projects/or/treecreeper/packages/tc-schema-validator/validation/ajv-test.js:34:1)
    at Module._compile (internal/modules/cjs/loader.js:959:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:995:10)
    at Module.load (internal/modules/cjs/loader.js:815:32)
    at Function.Module._load (internal/modules/cjs/loader.js:727:14)
    at Function.Module.runMain (internal/modules/cjs/loader.js:1047:10)
    at internal/main/run_main_module.js:17:11 {
  errors: [
    {
      keyword: 'additionalProperties',
      dataPath: '',
      schemaPath: '#/additionalProperties',
      params: { additionalProperty: 'b' },
      message: 'should NOT have additional properties'
    }
  ],
  validation: true,
  ajv: true
}
/*** Validating ***/
{ a: 'match', b: 'other' }
ValidationError: validation failed
    at validate (/Users/rhys.evans/Projects/or/treecreeper/packages/tc-schema-validator/validation/ajv-test.js:28:15)
    at Object.<anonymous> (/Users/rhys.evans/Projects/or/treecreeper/packages/tc-schema-validator/validation/ajv-test.js:35:1)
    at Module._compile (internal/modules/cjs/loader.js:959:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:995:10)
    at Module.load (internal/modules/cjs/loader.js:815:32)
    at Function.Module._load (internal/modules/cjs/loader.js:727:14)
    at Function.Module.runMain (internal/modules/cjs/loader.js:1047:10)
    at internal/main/run_main_module.js:17:11 {
  errors: [
    {
      keyword: 'additionalProperties',
      dataPath: '',
      schemaPath: '#/additionalProperties',
      params: { additionalProperty: 'b' },
      message: 'should NOT have additional properties'
    }
  ],
  validation: true,
  ajv: true
}

src.js

const Ajv = require('ajv').default;
const ajv = new Ajv({ allErrors: true });

const schema = {
	type: 'object',
	properties: {
		a: {type: 'string'},
	},
	additionalProperties: false,
	if: {
		properties: {
			a: {pattern: 'match'}
		}
	},
	then: {
		properties: {
			b: {type: 'string'}
		}
	}
}


const validate = obj => {
	console.log('/*** Validating ***/')
	console.log(obj)
	if (!ajv.validate(schema, obj)) {
		console.dir(new Ajv.ValidationError(ajv.errors), { depth: 10 });
	}
}

validate({a: 'some'})
validate({b: 'other'})
validate({a: 'some', b: 'other'})
validate({a: 'match', b: 'other'})