OneOf validation issue

[SypMinh]

What version of Ajv are you using? Does the issue happen if you use the latest version?
ajv: "8.12.0"
Ajv options object

  const ajv = new Ajv({
    allErrors: true,
    multipleOfPrecision: 1,
  });

JSON Schema

const eventSchema = {
  type: 'object',
  properties: {
    oneProperty: {
      oneOf: [
        {
          type: 'object',
          properties: {
            absolute: {
              type: 'number',
              minimum: 1,
              maximum: 16,
              multipleOf: 1,
            },
          },
        },
        {
          type: 'object',
          properties: {
            relative: {
              type: 'number',
              minimum: -8,
              maximum: 8,
              multipleOf: 1,
            },
          },
        },
      ],
    },
  },
  required: ['oneProperty'],
};

Sample data

{
    "oneProperty": {
        "absolute": "-1"
    }
}

Your code

const validateRequestParams = (
  requestParams,
  eventSchema
) => {
  const ajv = new Ajv({
    allErrors: true,
    multipleOfPrecision: 1,
  });
  const validate = ajv.compile(eventSchema);
  const valid = validate(requestParams ?? {});
  if (!valid) {
    return false;
  }
  return true;
};

Validation result, data AFTER validation, error messages
true

What results did you expect?
false

[jasoniangreen]

The problem is that the second schema you have defined does not prevent additionalProperties, nor does it "require" a property of relative. Therefore it passes as true for the second schema in the oneOf. If you want this to fail either make additionalProperties false or add required.

These are common mistakes when working with JSON Schema.