如何使用 ajv 模式验证来验证值是否为 double 格式和/或类型？

Question

Im using Ajv version 07.

I am trying to validate that the value of a property, returned by the JSON response body is of type and format double in postman, using ajv validation, however, I'm not being able to do it. I've tried searching it online, but still did not find anything about it.

I've tried typing the following:

• "type" : "double",

  "format": "double"

• "type": "Double",

  "format": "Double"

• "type":"number"

  "format":"double"

All the above attempts were unsuccessful as they all come with an error message saying either:

• Error: unknown type "double" is used in schema

or

• Error: unknown format "double" is used in schema

Would anyone be able to help me with this please?

schema

var Ajv = require ('ajv'),
ajv = new Ajv ({logger:console}),
expectedResponseSchema = 
{
    "items": {
        "required": [
            "payments"
     ],
        "properties": {
    "payments": {
                "items": {
                    "required": [
                        "amount"
    ]
        "properties": {
                        "amount": {
                            "$id": "#/items/properties/payments/items/properties/amount",
                            "type": "number",
                            "format": "double"
                        }
   }
  }
 }
}
}

Postman test

var currentSchPmExpTest;

try{     
currentSchPmExpTest = ' expectedResponseSchema variable';
    pm.expect(ajv.validate(expectedResponseSchema, jsonData)).to.be.true;
pm.test('Test 1 - PASSED - expectedResponseSchema variable data matches schema returned by body response!', () => true);
} catch(e){
    pm.test('Test 1 - FAILED - Expected data does not match response body data!', () => {throw new Error(e.message + " in " + currentSchPmExpTest)});
}

body response

[
  {
    "payments": [
      {
        "amount": 2.200000045367898,

      }
    ]
  }
]

Answer 1

I'm not sure where you're getting the type and format from but as per the AJV docs (could be out of date) that isn't a valid type .

EDIT:

From your update, I would recommend changing the test script to something like this so that you correct part of the schema is getting checked:

let schema = {
    "type": "array",
    "items": {
        "type": "object",
        "required": [
            "payments"
        ],
        "properties": {
            "payments": {
                "type": "array",
                "items": {
                    "type": "object",
                    "required": [
                        "amount"
                    ],
                    "properties": {
                        "amount": {
                            "type": "number",
                        }
                    }
                }
            }
        }
    }
}

pm.test("Check Schema", () => {
    pm.response.to.have.jsonSchema(schema)
}) 

The try/catch block can be added around this if you need too.