{
 "schema": "aiblocks-page/1",
 "id": "build-an-app-from-an-openapi-spec",
 "type": "skill",
 "name": "OpenAPI app builder",
 "summary": "Share an OpenAPI spec and target stack. Get app code, tests and setup notes.",
 "headline": "OpenAPI app builder",
 "subhead": "Share your API spec and chosen stack. Check the contract, build the app and get code with tests and setup notes.",
 "job": {
  "id": "build-software",
  "name": "Build and ship software"
 },
 "level": "intermediate",
 "thinking": "medium",
 "tested": true,
 "updated": "2026-10-28",
 "first_published": "2026-10-25",
 "inputs": [
  {
   "type": "api_spec",
   "required": true,
   "label": "Api spec",
   "what": "an API's spec, such as an OpenAPI file: the endpoints, data shapes, sign-in method and errors"
  },
  {
   "type": "question",
   "required": false,
   "label": "Question",
   "what": "the problem, decision or piece of work you want help with, and what a good outcome looks like"
  }
 ],
 "outputs": [
  {
   "type": "codebase",
   "required": true,
   "label": "Codebase",
   "what": "a project's code, in a folder or repo the AI can open"
  },
  {
   "type": "document",
   "required": true,
   "label": "Document",
   "what": "a finished document, such as a Word file, a PDF or a page of notes"
  }
 ],
 "you_give": [
  "Your OpenAPI spec as a link, a file or pasted text.",
  "Your target framework and version, such as Node with Express.",
  "Your login method, if the spec does not name one (optional).",
  "Business rules the spec leaves open (optional).",
  "Whether you want a database, Docker or pagination (optional)."
 ],
 "you_get": [
  "A project folder layout for your chosen framework.",
  "Route handlers for every path and method in your spec.",
  "Data types built from your spec's schemas.",
  "Service code, tests and example requests.",
  "A README, .gitignore and .env.example.",
  "A list of gaps and unclear parts in your spec."
 ],
 "use_when": [
  "You have an OpenAPI file and need a working server to start from.",
  "A team has agreed the API design and now needs the first version of the code.",
  "You want a fast mock server so front-end work can start.",
  "You want to test whether your spec is complete by seeing what gets built."
 ],
 "skip_when": [
  "You have no spec and your API is hand-written: write the spec first in a spec design tool, or ask a developer to build it by hand.",
  "Your spec is private and you cannot share it with an AI tool: ask a developer on your team to run a code generator locally.",
  "You only need a client to call an API, not a server: use the client generator that comes with your framework."
 ],
 "output_sample": {
  "input": [
   "Your OpenAPI spec as a link, a file or pasted text",
   "Your target framework and version",
   "Your login method, such as API keys or JWT (optional)",
   "Business rules the spec leaves open (optional)",
   "Database and Docker choices (optional)"
  ],
  "prerequisites": [
   "An AI that can write many files, or room in a chat to paste each file",
   "A way to run code on your computer if you want to run the tests"
  ],
  "output": [
   {
    "name": "README.md",
    "contains": "How to set up, configure and run the app, and how to test the endpoints."
   },
   {
    "name": "Build config",
    "contains": "The framework's package or build file, such as package.json, pom.xml or build.gradle."
   },
   {
    "name": "Controllers",
    "contains": "Route handlers for each path and method in your spec, with validation and error handling."
   },
   {
    "name": "Services",
    "contains": "Business logic behind each route, kept apart from the HTTP layer."
   },
   {
    "name": "Models",
    "contains": "Data types built from the schemas in your spec."
   },
   {
    "name": "Repositories and config",
    "contains": "Data access code if you want a database, plus app settings and startup code."
   },
   {
    "name": "Tests",
    "contains": "Unit tests for controllers and services, plus example requests."
   },
   {
    "name": ".gitignore and .env.example",
    "contains": "Files that keep secrets out of git and list the settings the app needs."
   }
  ]
 },
 "how_to_use": [
  "Open Claude, ChatGPT or Gemini and paste the skill text, or add the skill folder if your tool takes files.",
  "Paste your OpenAPI spec, or give a link if your AI can open web pages.",
  "Say which framework and version you want. If you skip this, your AI should ask before it writes code.",
  "Answer its questions about database, login method, Docker and tests.",
  "Read the list of gaps in your spec, then check the routes against your spec.",
  "Copy the files into a folder. To install and run the tests, you need code running on your own computer."
 ],
 "checks": [],
 "next": [
  {
   "name": "Software developer from specifications",
   "url": "https://useaiblocks.com/skills/spec-builder",
   "why": "Build it"
  },
  {
   "name": "API spec writer",
   "url": "https://useaiblocks.com/skills/api-spec-writer",
   "why": "Build it"
  },
  {
   "name": "REST API designer",
   "url": "https://useaiblocks.com/skills/rest-api-designer",
   "why": "Build it"
  }
 ],
 "source": {
  "by": "github",
  "repo": "github/awesome-copilot",
  "url": "https://github.com/github/awesome-copilot/tree/613efc8c21d9b3ce642dff361d17006cd9967e28/skills/openapi-to-application-code",
  "licence": "MIT",
  "original_name": "openapi-to-application-code",
  "commit": "613efc8c21d9b3ce642dff361d17006cd9967e28"
 },
 "credits": [
  {
   "title": "openapi-to-application-code skill",
   "by": "github",
   "url": "https://github.com/github/awesome-copilot/tree/613efc8c21d9b3ce642dff361d17006cd9967e28/skills/openapi-to-application-code",
   "used": "Original instructions and supporting files, with attribution and the MIT licence. Display copy describes the task."
  }
 ],
 "files": [
  "LICENSE"
 ],
 "links": {
  "page": "https://useaiblocks.com/skills/build-an-app-from-an-openapi-spec",
  "markdown": "https://useaiblocks.com/skills/build-an-app-from-an-openapi-spec.md",
  "json": "https://useaiblocks.com/skills/build-an-app-from-an-openapi-spec.json",
  "instructions": "https://useaiblocks.com/skills/build-an-app-from-an-openapi-spec/SKILL.md",
  "download": "https://useaiblocks.com/skills/build-an-app-from-an-openapi-spec.zip",
  "api_item": "https://useaiblocks.com/api/v1/items/build-an-app-from-an-openapi-spec",
  "api_document": "https://useaiblocks.com/api/v1/documents/skill/build-an-app-from-an-openapi-spec",
  "mcp": "https://useaiblocks.com/mcp"
 }
}