JSON Schema exemple not working with jest

[matheust3]

ajv version: "^8.11.0"

It doesn't even compile :(

//schema.spec.ts

test('', async () => {
    interface MyData {
      foo: number
      bar?: string
    }

    const schema: JSONSchemaType<MyData> = {
      type: 'object',
      properties: {
        foo: { type: 'integer' },
        bar: { type: 'string', nullable: true }
      },
      required: ['foo'],
      additionalProperties: false
    }

    // validate is a type guard for MyData - type is inferred from schema type
    ajv.compile(schema)
 })

Console:

schema is invalid: data/type must NOT have additional properties, data must have property 'ref', data/type must be equal to one of the allowed values, data must have property 'enum', data must have property 'elements', data/properties/foo/type must NOT have additional properties, data/properties/foo must have property 'ref', data/properties/foo/type must be equal to one of the allowed values, data/properties/foo must have property 'enum', data/properties/foo must have property 'elements', data/properties/foo must have property 'properties', data/properties/foo must have property 'optionalProperties', data/properties/foo must have property 'discriminator', data/properties/foo must have property 'values', data/properties/foo must match a schema in union, data must have property 'optionalProperties', data must have property 'discriminator', data must have property 'values', data must match a schema in union

[KostyaTretyak]

Try remove async key word.

[epoberezkin]

do you have strict (or strictNullChecks) mode enabled in TypeScript?

[tobilg]

I have the same issue unfortunately

[elshize]

I'm experiencing a similar thing; I noticed that I get this error when I add "type": "object" to any of my schemas.

[jason-curtis]

I had a similar issue which was resolved by explicitly using the 2020 draft schema. My error message was something like:

schema is invalid: data must have required property 'something', schema is invalid: data must have required property 'somethingElse', data must NOT have additional properties, data must NOT have additional properties

My Fix

schema

I updated the schema to add the "$schema" property:

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {...},
  "required": [...],
  "additionalProperties": false
}

typescript

I then updated the code in my .ts file to import Ajv from /dist/2020 so the 2020-12 draft schema is recognized:

import mySchema from '@/mySchema.json';
import Ajv from 'ajv/dist/2020';

const ajv = new Ajv({ allErrors: true });
const validator = ajv.compile(mySchema); // works!