Code Generation and Scaffolding Cheat Sheet

Updated 2026-05-17

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Code generation and scaffolding are techniques that automate the creation of boilerplate code, project structure, and repetitive patterns through template engines, AST manipulation, and schema-driven approaches. These tools transform high-level specifications into executable code, dramatically reducing manual work while maintaining consistency across large codebases. The key insight: good generators don't just save time—they encode architectural decisions and team conventions into reusable, version-controlled artifacts that evolve with your project.

What This Cheat Sheet Covers

This topic spans 20 focused tables and 104 indexed concepts, 95 flashcards. Below is a complete table-by-table outline of this topic, spanning foundational concepts through advanced details.

Table 1: Project Scaffolding GeneratorsTable 2: AST Manipulation and CodemodsTable 3: Template Engines for Code GenerationTable 4: API Schema-Driven Code GenerationTable 5: gRPC and Protocol Buffers Code GenerationTable 6: Database and ORM Code GenerationTable 7: Schema Validation and Type GenerationTable 8: TypeScript-Specific Code GenerationTable 9: Monorepo Code Generation PatternsTable 10: AI-Assisted Code GenerationTable 11: Build-Time Code GenerationTable 12: CLI and Interactive Prompt LibrariesTable 13: Custom Generator Development Best PracticesTable 14: Watch Mode and Live ReloadingTable 15: Code Generation Testing and ValidationTable 16: Schema Evolution and VersioningTable 17: Anti-Patterns and PitfallsTable 18: Advanced AST TechniquesTable 19: Language-Specific GeneratorsTable 20: Integration with IDEs and Editors

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Table 1: Project Scaffolding Generators

These are the tools you reach for when starting something new — bootstrapping an entire project or stamping out a component, route, or library inside an existing one. They range from broad ecosystems like Yeoman to opinionated full-stack starters like create-t3-app, but all share one job: turn a few prompts into a working file structure so you never write boilerplate by hand.

Tool	Example	Description
Yeoman	`yo webapp` `yo generator-node`	• CLI scaffolding system with vast ecosystem of community generators • uses Inquirer.js prompts and template-based file generation for bootstrapping entire projects
Plop.js	`plop component MyButton` `plop api-route users`	• Micro-generator framework using Handlebars templates • ideal for generating components, routes, or files within existing projects with custom prompts
Hygen	`hygen component new` `hygen init self`	• Fast, scalable generator with shell-based templates • stores generators in `_templates/` folder and supports conditional file generation based on prompts
Nx workspace generators	`nx g @nx/react:component` `nx workspace-generator my-gen`	• Built-in code generation for Nx monorepos • creates applications, libraries, and custom workspace-specific generators with atomic changes
Angular schematics	`ng generate component user` `ng g service auth`	• Template-based code generators for Angular • uses virtual file system to preview changes before applying and supports custom schematics via AST manipulation
Create React App alternatives	`npm create vite@latest` `npx create-next-app`	• Modern React project bootstrapping tools • Vite offers fast dev server with HMR, Next.js provides full-stack framework with routing built-in
create-t3-app	`npm create t3-app@latest` `pnpm dlx create-t3-app`	• Opinionated Next.js starter with tRPC, Prisma, NextAuth, and Tailwind pre-configured • generates type-safe full-stack applications with best practices

Table 2: AST Manipulation and Codemods

Codemods treat your source not as text but as a tree, so a single script can safely rename an API or migrate a whole codebase across thousands of files. The tools here parse code into an abstract syntax tree, let you transform it programmatically, and reprint it — with the better ones preserving your original formatting so the diff stays minimal.

Tool	Example	Description
jscodeshift	`jscodeshift -t transform.js src/`	• Facebook's codemod toolkit wrapping recast for large-scale JavaScript/TypeScript refactoring • parses code to AST, applies transformations, preserves formatting

The rest of this section is part of the full cheat sheet

Table 3: Template Engines for Code Generation

Under the hood, most scaffolders are just template engines filling placeholders with your answers. The choice usually comes down to how much logic you want in the template itself — Handlebars and Mustache stay deliberately logic-less, while EJS and Jinja2 let you embed real code for the trickier generation tasks.

Engine	Example	Description
Handlebars	`{{#each users}}` `<li>{{name}}</li>` `{{/each}}`	• Logic-less template engine used by Plop and Yeoman • compiles templates to JavaScript functions for fast execution with helpers and partials support

The rest of this section is part of the full cheat sheet

Table 4: API Schema-Driven Code Generation

When the API contract is the source of truth, these generators read your OpenAPI, GraphQL, or JSON schema and produce the client SDKs, server stubs, and TypeScript types automatically. The payoff is end-to-end type safety — change the spec and regenerate, and the frontend and backend stay in lockstep instead of drifting apart by hand.

Generator	Example	Description
OpenAPI Generator	`openapi-generator-cli generate` `-i api.yaml -g typescript-axios`	• Generates client SDKs, server stubs, and docs from OpenAPI/Swagger specs for 50+ languages • fork of Swagger Codegen with active development

The rest of this section is part of the full cheat sheet

Table 1: Project Scaffolding Generators

Tool	Example	Description
Yeoman	`yo webapp` `yo generator-node`	• CLI scaffolding system with vast ecosystem of community generators • uses Inquirer.js prompts and template-based file generation for bootstrapping entire projects
Plop.js	`plop component MyButton` `plop api-route users`	• Micro-generator framework using Handlebars templates • ideal for generating components, routes, or files within existing projects with custom prompts
Hygen	`hygen component new` `hygen init self`	• Fast, scalable generator with shell-based templates • stores generators in `_templates/` folder and supports conditional file generation based on prompts
Nx workspace generators	`nx g @nx/react:component` `nx workspace-generator my-gen`	• Built-in code generation for Nx monorepos • creates applications, libraries, and custom workspace-specific generators with atomic changes
Angular schematics	`ng generate component user` `ng g service auth`	• Template-based code generators for Angular • uses virtual file system to preview changes before applying and supports custom schematics via AST manipulation
Create React App alternatives	`npm create vite@latest` `npx create-next-app`	• Modern React project bootstrapping tools • Vite offers fast dev server with HMR, Next.js provides full-stack framework with routing built-in
create-t3-app	`npm create t3-app@latest` `pnpm dlx create-t3-app`	• Opinionated Next.js starter with tRPC, Prisma, NextAuth, and Tailwind pre-configured • generates type-safe full-stack applications with best practices

Table 2: AST Manipulation and Codemods

Tool	Example	Description
jscodeshift	`jscodeshift -t transform.js src/`	• Facebook's codemod toolkit wrapping recast for large-scale JavaScript/TypeScript refactoring • parses code to AST, applies transformations, preserves formatting

Table 3: Template Engines for Code Generation

Engine	Example	Description
Handlebars	`{{#each users}}` `<li>{{name}}</li>` `{{/each}}`	• Logic-less template engine used by Plop and Yeoman • compiles templates to JavaScript functions for fast execution with helpers and partials support

Table 4: API Schema-Driven Code Generation

Generator	Example	Description
OpenAPI Generator	`openapi-generator-cli generate` `-i api.yaml -g typescript-axios`	• Generates client SDKs, server stubs, and docs from OpenAPI/Swagger specs for 50+ languages • fork of Swagger Codegen with active development