ai-agent

The-API-Book

Name: The-API-Book
Author: twirl

‘The API’ book by Sergey Konstantinov

805 stars49 forksTypeScriptUpdated 6/14/2026100% free · open source

What it does

A TypeScript‑based interactive book that walks you through building real‑world APIs, complete with runnable code examples and a live preview server.

When to use it

•You want a step‑by‑step, code‑first tutorial for building REST or GraphQL APIs in TypeScript.
•Your team needs a shared, executable reference that can be run locally to see API behavior instantly.
•You are evaluating API design patterns (validation, auth, pagination) and need live examples you can modify.

Ready-to-paste prompt

`curl -X POST http://localhost:3000/api/users -H 'Content-Type: application/json' -d '{"name":"Ada Lovelace","email":"ada@example.com"}'`  // creates a user using the fully‑implemented CRUD example in chapter 03.

Heads up: The project requires Node >=18 and a local PostgreSQL instance for chapters that use Prisma; without the database running the build and dev scripts will error out.

Saves to your device

Use with Claude

New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

✅ Light setup

Installs with a command or two; your AI agent can do it for you.

Try it instantly — no install

Claude Code

mkdir -p ~/.claude/skills/the-api-book && curl -fsSL https://workflowstacks.com/api/skills/the-api-book/claude-skill -o ~/.claude/skills/the-api-book/SKILL.md

Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)

claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

What's inside — free to inspect

No purchase needed

Read the entire source before you build — unlike paid marketplaces that hide it behind a buy button.

top-level files

folders

717.3M

source size

Other

license

Key files

jest.config.js

package.json

README.md

tsconfig.json

File tree

.github/

docs/

scripts/

src/

.gitignore

.prettierignore

jest.config.js

LICENSE.md

package.json

README.md

ROADMAP.md

tsconfig.json

Use with Claude

New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

✅ Light setup

Installs with a command or two; your AI agent can do it for you.

Try it instantly — no install

Claude Code

mkdir -p ~/.claude/skills/the-api-book && curl -fsSL https://workflowstacks.com/api/skills/the-api-book/claude-skill -o ~/.claude/skills/the-api-book/SKILL.md

Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)

claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

Quick Actions

Details

Creator

twirl

Language

TypeScript