Microsoft Package PackageContent API

openapi: 3.1.0
info:
  title: NuGet Server API (V3) PackageContent API
  description: HTTP endpoints for discovering, downloading, and publishing NuGet packages against nuget.org and compatible package sources. Entry point is the service index. Endpoints below cover service index, search, registration metadata, and package content (flat container).
  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
      operationId: listPackageVersions
      parameters:
      - name: id
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Versions
          content:
            application/json:
              schema:
                type: object
                properties:
                  versions:
                    type: array
                    items:
                      type: string
        '404':
          description: 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
      - name: version_lower
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Package content
          content:
            application/octet-stream:
              schema:
                type: string
                format: binary
        '404':
          description: Not found
components:
  securitySchemes:
    apiKey:
      type: apiKey
      in: header
      name: X-NuGet-ApiKey
      description: Required only for publish/delete operations on nuget.org.
x-generated-from: https://learn.microsoft.com/en-us/nuget/api/overview
x-generated-by: claude-genwave10-08-2026-05-23