How to have multiple infinite objects without an array - Open API / Swagger - json

Question

I'm trying to setup an open api spec for the following snippet of JSON:
"test1": {
"1739573957": {
"tester1": 123,
"tester2": "Company"
},
"64903826718": {
"tester1": 123,
"tester2": "Company"
}
"5902849189": {
"tester1": 123,
"tester2": "Company"
}
}
The objects inside test1 have randomized guids and are listed in a way that typically would be an array, but is not. There could potentially be an infinite number of objects inside test 1. Anyone know how to set this up?

Answer 1

test1 is a string-to-object dictionary and can be defined as follows (assuming OpenAPI 3):
components:
schemas:
Tester: # Or however you would name the nested objects
tester1:
type: integer
example: 123
tester2:
type: string
example: Company
...
test1:
type: object
additionalProperties:
$ref: '#/components/schemas/Tester'
# Optional example for the `test1` property
example:
'1739573957':
tester1: 123
tester2: Company
'64903826718':
tester1: 123
tester2: Company
The objects inside test1 have randomized guids
In OpenAPI 3.1, you can use patternProperties instead of additionalProperties to define that the keys inside test1 are numeric strings. Earlier OpenAPI versions don't have a way to define the format of dictionary keys.
# openapi: 3.1.0
test1:
type: object
patternProperties: # <-----
'^\d+$': # <-----
$ref: '#/components/schemas/Tester'

Answer 2

You are looking for the free-form-object:
A free-form object (arbitrary property/value pairs) is defined as:
type: object
This is equivalent to
type: object
additionalProperties: true
and
type: object
additionalProperties: {}
However, if you can change the API, I'd highly recommend to change it to an array of tests or whatever the object defines. Put the id as property into this object and you're good to go. This makes creating DTOs for it a lot easier.