Schema-first approach in NestJS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the Schema-first approach in NestJS GraphQL?

It is a way to build GraphQL APIs by first defining the GraphQL schema using SDL (Schema Definition Language), then implementing the resolvers in code to match the schema.

beginner

How do you define a GraphQL schema in the Schema-first approach?

You write the schema using SDL in a .graphql file or a string, describing types, queries, mutations, and subscriptions before writing any resolver code.

beginner

What is the role of resolvers in the Schema-first approach?

Resolvers are functions that provide the logic to fetch or modify data for each field defined in the GraphQL schema.

intermediate

What NestJS module helps to use the Schema-first approach easily?

The @nestjs/graphql module supports Schema-first by allowing you to load SDL files and connect them with resolver classes.

intermediate

What is one advantage of the Schema-first approach?

It allows frontend and backend teams to agree on the API contract early by sharing the schema file, improving collaboration and clarity.

In the Schema-first approach, what do you write first?

A Database models

B GraphQL schema using SDL

C Resolver functions

D REST API endpoints

You start by writing the GraphQL schema using SDL before implementing resolvers.

Which file type commonly holds the schema in Schema-first approach?

A .graphql

B .ts

C .json

D .js

The schema is usually written in .graphql files using SDL.

What does a resolver do in Schema-first GraphQL?

A Defines the schema types

B Creates database tables

C Fetches or modifies data for schema fields

D Handles HTTP requests

Resolvers provide the logic to get or change data for each field in the schema.

Which NestJS package supports Schema-first GraphQL development?

A @nestjs/graphql

B @nestjs/common

C @nestjs/core

D @nestjs/typeorm

@nestjs/graphql provides tools to use Schema-first approach in NestJS.

What is a key benefit of Schema-first approach?

A No schema definition needed

B No need to write resolvers

C Automatically generates database schema

D Clear API contract shared early

Schema-first lets teams agree on API structure early by sharing the schema.

Explain the steps to create a GraphQL API using the Schema-first approach in NestJS.

Think about writing the schema first, then the code.

What are the advantages of using the Schema-first approach compared to code-first?

Focus on teamwork and clarity benefits.