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Generate .http files from OpenAPI (Swagger) specifications

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Build Smoke Tests NuGet Quality Gate Status codecov

HTTP File Generator

Generate .http files from OpenAPI specifications

.http files were made popular by the Visual Studio Code extension REST Client, which then was adopted by JetBrains IDE's, and later on Visual Studio 2022

Installation

This is tool is distrubuted as a .NET Tool on NuGet.org

To install, simply use the following command

dotnet tool install --global httpgenerator

Usage

USAGE:
    httpgenerator [URL or input file] [OPTIONS]

EXAMPLES:
    httpgenerator ./openapi.json
    httpgenerator ./openapi.json --output ./
    httpgenerator ./openapi.json --output-type onefile
    httpgenerator https://petstore.swagger.io/v2/swagger.json
    httpgenerator https://petstore3.swagger.io/api/v3/openapi.json --base-url https://petstore3.swagger.io
    httpgenerator ./openapi.json --authorization-header Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9c
    httpgenerator ./openapi.json --azure-scope [Some Application ID URI]/.default
    httpgenerator ./openapi.json --generate-intellij-tests
    httpgenerator ./openapi.json --custom-header X-Custom-Header: Value --custom-header X-Another-Header: AnotherValue

ARGUMENTS:
    [URL or input file]    URL or file path to OpenAPI Specification file

OPTIONS:
                                                                DEFAULT
    -h, --help                                                                       Prints help information
    -v, --version                                                                    Prints version information
    -o, --output <OUTPUT>                                       ./                   Output directory
        --no-logging                                                                 Don't log errors or collect telemetry
        --skip-validation                                                            Skip validation of OpenAPI Specification file
        --authorization-header <HEADER>                                              Authorization header to use for all requests
        --load-authorization-header-from-environment                                 Load the authorization header from an environment variable or define it in the
                                                                                     .http file. You can use --authorization-header-variable-name to specify the
                                                                                     environment variable name
        --authorization-header-variable-name <VARIABLE-NAME>    authorization        Name of the environment variable to load the authorization header from
        --content-type <CONTENT-TYPE>                           application/json     Default Content-Type header to use for all requests
        --base-url <BASE-URL>                                                        Default Base URL to use for all requests. Use this if the OpenAPI spec doesn't
                                                                                     explicitly specify a server URL
        --output-type <OUTPUT-TYPE>                             OneRequestPerFile    OneRequestPerFile generates one .http file per request. OneFile generates a
                                                                                     single .http file for all requests. OneFilePerTag generates one .http file per
                                                                                     first tag associated with each request
        --azure-scope <SCOPE>                                                        Azure Entra ID Scope to use for retrieving Access Token for Authorization header
        --azure-tenant-id <TENANT-ID>                                                Azure Entra ID Tenant ID to use for retrieving Access Token for Authorization
                                                                                     header
        --timeout <SECONDS>                                     120                  Timeout (in seconds) for writing files to disk
        --generate-intellij-tests                                                    Generate IntelliJ tests that assert whether the response status code is 200
        --custom-header                                                              Add custom HTTP headers to the generated request

Running the following:

httpgenerator https://petstore.swagger.io/v2/swagger.json

Outputs the following:

HTTP File Generator v0.1.5
Support key: mbmbqvd

OpenAPI statistics:
 - Path Items: 14
 - Operations: 20
 - Parameters: 14
 - Request Bodies: 9
 - Responses: 20
 - Links: 0
 - Callbacks: 0
 - Schemas: 67

Files: 20
Duration: 00:00:02.3089450

Which will produce the following files:

-rw-r--r-- 1 christian 197121  593 Dec 10 10:44 DeleteOrder.http        
-rw-r--r-- 1 christian 197121  231 Dec 10 10:44 DeletePet.http
-rw-r--r-- 1 christian 197121  358 Dec 10 10:44 DeleteUser.http
-rw-r--r-- 1 christian 197121  432 Dec 10 10:44 GetFindPetsByStatus.http
-rw-r--r-- 1 christian 197121  504 Dec 10 10:44 GetFindPetsByTags.http  
-rw-r--r-- 1 christian 197121  371 Dec 10 10:44 GetInventory.http       
-rw-r--r-- 1 christian 197121  247 Dec 10 10:44 GetLoginUser.http       
-rw-r--r-- 1 christian 197121  291 Dec 10 10:44 GetLogoutUser.http      
-rw-r--r-- 1 christian 197121  540 Dec 10 10:44 GetOrderById.http
-rw-r--r-- 1 christian 197121  275 Dec 10 10:44 GetPetById.http
-rw-r--r-- 1 christian 197121  245 Dec 10 10:44 GetUserByName.http
-rw-r--r-- 1 christian 197121  513 Dec 10 10:44 PostAddPet.http
-rw-r--r-- 1 christian 197121  521 Dec 10 10:44 PostCreateUser.http
-rw-r--r-- 1 christian 197121  610 Dec 10 10:44 PostCreateUsersWithListInput.http
-rw-r--r-- 1 christian 197121  464 Dec 10 10:44 PostPlaceOrder.http
-rw-r--r-- 1 christian 197121  299 Dec 10 10:44 PostUpdatePetWithForm.http
-rw-r--r-- 1 christian 197121  274 Dec 10 10:44 PostUploadFile.http
-rw-r--r-- 1 christian 197121  513 Dec 10 10:44 PutUpdatePet.http
-rw-r--r-- 1 christian 197121  541 Dec 10 10:44 PutUpdateUser.http

In this example, the contents of PostAddPet.http looks like this:

@contentType = application/json

#############################################
### Request: POST /pet
### Summary: Add a new pet to the store
### Description: Add a new pet to the store
#############################################

POST https://petstore3.swagger.io/api/v3/pet
Content-Type: {{contentType}}

{
  "id": 0,
  "name": "name",
  "category": {
    "id": 0,
    "name": "name"
  },
  "photoUrls": [
    ""
  ],
  "tags": [
    {
      "id": 0,
      "name": "name"
    }
  ],
  "status": "available"
}

and the contents of GetPetById.http looks like this:

@contentType = application/json

#######################################
### Request: GET /pet/{petId}
### Summary: Find pet by ID
### Description: Returns a single pet
#######################################

### Path Parameter: ID of pet to return
@petId = 0

GET https://petstore3.swagger.io/api/v3/pet/{{petId}}
Content-Type: {{contentType}}

with the --generate-intellij-tests option, the output looks like this:

@contentType = application/json

#######################################
### Request: GET /pet/{petId}
### Summary: Find pet by ID
### Description: Returns a single pet
#######################################

### Path Parameter: ID of pet to return
@petId = 1

GET https://petstore3.swagger.io/api/v3/pet/{{petId}}
Content-Type: {{contentType}}

> {%
    client.test("Request executed successfully", function() {
        client.assert(
            response.status === 200, 
            "Response status is not 200");
    });
%}

Here's an advanced example of generating .http files for a REST API hosted on Microsoft Azure that uses the Microsoft Entra ID service as an STS. For this example, I use PowerShell and Azure CLI to retrieve an access token for the user I'm currently logged in with.

az account get-access-token --scope [Some Application ID URI]/.default `
| ConvertFrom-Json `
| %{
    httpgenerator `
        https://api.example.com/swagger/v1/swagger.json `
        --authorization-header ("Bearer " + $_.accessToken) `
        --base-url https://api.example.com `
        --output ./HttpFiles 
}

You can also use the --azure-scope and azure-tenant-id arguments internally use DefaultAzureCredentials from the Microsoft.Extensions.Azure NuGet package to retrieve an access token for the specified scope.

httpgenerator `
  https://api.example.com/swagger/v1/swagger.json `
  --azure-scope [Some Application ID URI]/.default `
  --base-url https://api.example.com `
  --output ./HttpFiles 

Error Logging, Telemetry, and Privacy

This tool collects errors and tracks features usages to service called Exceptionless

By default, error logging and telemetry collection is enabled but it is possible to opt-out by using the --no-logging CLI argument.

User tracking is done anonymously using the Support key shown when running the tool and a generated anonymous identity based on a secure hash algorithm of username@host.

HTTP File Generator v0.1.5
Support key: mbmbqvd

The support key is just the first 7 characters of the generated anonymous identity

Exceptionless

Exceptionless

The --authorization-header value is [REDACTED] and the same goes for all personal identifiable information like the IP address, machine name, and file system folders

Exceptionless

It's important to know that no support key will be generated if you opt-out from telemetry collection and that the Exceptionless SDK will be completely disabled.

Visual Studio 2022 Extension

This tool is also available as a Visual Studio 2022 extension

From the Tools menu select Generate .http files

Tools menu

This opens the main dialog which has similar input fields as the CLI tool

Main dialog

You can acquire an Azure Entra ID access token by clicking on the ... button beside the Authorization Headers input field

Acquire Azure Entra ID access token

By default, the Output folder is pre-filled with the path of the currently active C# Project in the Solution Explorer, suffixed with \HttpFiles

Solution explorer

Once the .http files are generated you can easily open and inspect them

.http file

For tips and tricks on software development, check out my blog

If you find this useful and feel a bit generous then feel free to buy me a coffee ☕