How to change default swagger.json file path?

When using Swagger for API documentation management, you may sometimes need to change the default path of the swagger.json file to accommodate specific deployment or security requirements. Here are several methods to change the path of the swagger.json file across different frameworks.

1. Using Swashbuckle (ASP.NET Core)

In ASP.NET Core, if you use Swashbuckle as the Swagger tool, you can change the path of the swagger.json file by configuring Swagger generation options in the Startup.cs file. The following are the specific steps:

csharp
public void ConfigureServices(IServiceCollection services)
{
    services.AddSwaggerGen(c =>
    {
        c.SwaggerDoc("v1", new OpenApiInfo { Title = "My API", Version = "v1" });
    });
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    // Enable middleware to serve generated Swagger as a JSON endpoint
    app.UseSwagger(c =>
    {
        c.RouteTemplate = "api-docs/{documentName}/swagger.json";
    });

    // Enable middleware to serve swagger-ui
    app.UseSwaggerUI(c =>
    {
        c.SwaggerEndpoint("/api-docs/v1/swagger.json", "My API V1");
        c.RoutePrefix = "api-docs";
    });

    // Other configurations...
}

In the above code, the RouteTemplate property is set to "api-docs/{documentName}/swagger.json", which alters the default path for the swagger.json file.

2. Using Spring Boot (Java)

In the Spring Boot framework, you can modify the path of Swagger UI resources, including the swagger.json file, by configuring Spring MVC resource handlers. The following is an example configuration:

java
@Configuration
@EnableSwagger2
public class SwaggerConfig {
    @Bean
    public Docket api() {
        return new Docket(DocumentationType.SWAGGER_2)
                .select()
                .apis(RequestHandlerSelectors.any())
                .paths(PathSelectors.any())
                .build();
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/api-docs/**")
            .addResourceLocations("classpath:/META-INF/resources/");
        registry.addResourceHandler("/api-docs/swagger.json")
            .addResourceLocations("classpath:/META-INF/swagger/");
    }
}

In this Java code, the addResourceHandlers method is used to define handlers for /api-docs/** and /api-docs/swagger.json, thereby changing the location of the swagger.json file.

3. Using Flask (Python)

When using the Flasgger library in the Flask framework, you can configure the path of the swagger.json file as follows:

python
from flasgger import Swagger
from flask import Flask

app = Flask(__name__)
swagger_config = {
    "headers": [],
    "specs": [
        {
            "endpoint": 'apispec_1',
            "route": '/api-docs.json',
            "rule_filter": lambda rule: True,  # all in
            "model_filter": lambda tag: True,  # all in
        }
    ],
    "static_url_path": "/flasgger_static",
    "swagger_ui": True,
    "specs_route": "/api-docs/"
}

swagger = Swagger(app, config=swagger_config)

In this example, the specs list defines the configuration for each Swagger specification, where the route key indicates the new path for the swagger.json file.

Conclusion

The above methods provide ways to change the path of the swagger.json file in different environments. Depending on your technology stack, you can choose the appropriate configuration. Changing the path is sometimes done to better integrate with existing API gateways or comply with specific security policies.