Fetching resource list, Please wait

[Andy Philpotts]

Running on Windows, in Visual Studio, using the nuget SwashBuckle 5.6.0

When I visit the swagger UI I see the main window, but the only content is this message

    "fetching resource list: http://localhost:53649/swagger/docs/v1; Please wait."

The javascript console says "Unable to get property 'parameters' of undefined or null reference" swagger-ui-min-js (8,1384)

The URL mentioned does have data that looks good, so where to I go next to diagnose this?

{
    "swagger": "2.0",
    "info": {
        "version": "v1",
        "title": "Logical Ink Web API",
        "description": null,
        "termsOfService": null,
        "contact": null,
        "license": null,
        "vendorExtensions": {}
    },
    "host": "localhost:53649",
    "basePath": null,
    "schemes": ["http"],
    "consumes": null,
    "produces": null,
    "paths": {
        "/api/ApplicationInstance/{id}": {
            "$ref": null,
            "get": {
                "tags": ["ApplicationInstance"],
                "summary": "Get an application (smart-set) by id, include it's forms and templates as well as\r\nany instances that used the particular visit id",
                "description": null,
                "externalDocs": null,
                "operationId": "ApplicationInstance_Get",
                "consumes": [],
                "produces": ["application/json", "text/json"],
                "parameters": [{
                    "$ref": null,
                    "name": "id",

[Ron Ratovsky]

That doesn’t look good at all. `null` is not a valid value, and that’s a partial JSON.

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[Andy Philpotts]

I'm sorry, I intentionally posted a partial JSON, as it is very long, it is well formed, I attached the file

null is valid in some contexts, and I see it used in places were there are no parameters

Also, as a comparison, I created an almost empty toy project, and Swagger worked just fine there, so it is something with my Web API I suspect

I just need guidance on how to dig further, where is the JSON

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[Ron Ratovsky]

Actually no. The only place `null` is a valid value is as a value of extension. Having it anywhere else in the definition is invalid and will break tooling.

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[Andy Philpotts]

Wow, so I have to look at the source of that, I see a lot of this sort of thing: OK, so that begs a question, where do I look now...

            "put": null,

            "post": null,

            "delete": null,

            "options": null,

            "head": null,

            "patch": null,

            "parameters": null,

            "vendorExtensions": {}

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[Ron Ratovsky]

That’s a question to Swashbuckle…

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