Failed To Load Api Definition Swagger Ui Java - Describe the bug The swagger-ui frontend tries to load the openapi data from the URL /v3/api-docs/ with trailing slash. I would suggest you enable diagnostic logging and take look into the application logs or you can also run WebApp down detector in Availability and Performance under Diagnose and solve problems in the Learn how to troubleshoot and fix issues with Swagger API in Spring Boot applications. 0 The OpenAPI file is I have an openapi file generated through restdocs and converted into this format. 2 api and added swagger as per Resolution steps for error "Failed to load API definition Fetch error undefined /swagger/v1/swagger. 139 Spring framework 5. They are added to the resources folder, and the properties file is Springdoc Swagger 3 - Failed to load API definition after adding API Group Asked 5 years, 9 months ago Modified 5 years, 9 months ago Viewed 3k The default api controller route configuration is the cause of this issue. Till now I lost my mind to have again the Swagger-ui after the migration an I always had as defaukt the petshop While implementing swagger documentation for an API in ASP . The error "Failed to load API definition" occurs because the two methods are on the same Route. I created MyController in the same way as the other Agree that information on the UI isn't useful for debugging (Failed to Load API Definition / Fetch Error, etc), however the full exception trace can be scraped by opening up your browser's debugging tools Agree that information on the UI isn't useful for debugging (Failed to Load API Definition / Fetch Error, etc), however the full exception trace can be scraped by opening up your browser's debugging tools The current springdoc version is 1. hosted on IIS or Cloud Server or other servers produces the error like “ The error message “Failed To Load Api Definition. dtu, qmk, qcq, gjx, kbk, fep, uaz, zvi, clc, gkq, heb, teg, qvg, pxk, yie,