Microsoft .NET PackageContent API

openapi: 3.1.0
info:
  title: NuGet Server API (V3) PackageContent API
  description: The NuGet Server API is the set of HTTP endpoints used by the .NET CLI, NuGet client, Visual Studio, and other tooling to discover, download, publish, and unlist NuGet packages from nuget.org and compatible package sources. Entry point is the service index at /v3/index.json. Endpoints documented here cover discovery (service index), search, registration (package metadata), package base address (content), and publish.
  version: '3'
servers:
- url: https://api.nuget.org/v3
  description: nuget.org V3 API root
security: []
tags:
- name: PackageContent
paths:
  /flatcontainer/{id}/index.json:
    get:
      tags:
      - PackageContent
      summary: List package versions
      description: PackageBaseAddress resource — returns the list of all available versions for the specified package.
      operationId: listPackageVersions
      parameters:
      - name: id
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Versions document
          content:
            application/json:
              schema:
                type: object
                properties:
                  versions:
                    type: array
                    items:
                      type: string
        '404':
          description: Package not found
  /flatcontainer/{id}/{version}/{id_lower}.{version_lower}.nupkg:
    get:
      tags:
      - PackageContent
      summary: Download a package (.nupkg)
      operationId: downloadPackage
      parameters:
      - name: id
        in: path
        required: true
        schema:
          type: string
      - name: version
        in: path
        required: true
        schema:
          type: string
      - name: id_lower
        in: path
        required: true
        schema:
          type: string
        description: Lowercased package ID.
      - name: version_lower
        in: path
        required: true
        schema:
          type: string
        description: Lowercased version.
      responses:
        '200':
          description: NuGet package content
          content:
            application/octet-stream:
              schema:
                type: string
                format: binary
        '404':
          description: Not found
  /flatcontainer/{id}/{version}/{id_lower}.nuspec:
    get:
      tags:
      - PackageContent
      summary: Download a package manifest (.nuspec)
      operationId: downloadNuspec
      parameters:
      - name: id
        in: path
        required: true
        schema:
          type: string
      - name: version
        in: path
        required: true
        schema:
          type: string
      - name: id_lower
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Package nuspec XML
          content:
            application/xml:
              schema:
                type: string
        '404':
          description: Not found
components:
  securitySchemes:
    apiKey:
      type: apiKey
      in: header
      name: X-NuGet-ApiKey
      description: NuGet API key (required only for PackagePublish push/delete operations).
x-generated-from: https://learn.microsoft.com/en-us/nuget/api/overview
x-generated-by: claude-genwave10-08-2026-05-23