Backend Development challenges

Practice problem statements with input format, output format, constraints and solutions.

beginner

Backend Introduction challenge

Build a small solution that uses Backend Introduction in Backend Development and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

// Backend Core Script for Backend Introduction
console.log("Setting up secure backend service for Backend Introduction");

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core backend introduction pattern before polishing the final output.

Solution

// Backend Core Script for Backend Introduction solution
console.log("Setting up secure backend service for Backend Introduction solution");
beginner

NodeJS Core Runtime challenge

Build a small solution that uses NodeJS Core Runtime in Backend Development and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

// Backend Core Script for NodeJS Core Runtime
console.log("Setting up secure backend service for NodeJS Core Runtime");

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core nodejs core runtime pattern before polishing the final output.

Solution

// Backend Core Script for NodeJS Core Runtime solution
console.log("Setting up secure backend service for NodeJS Core Runtime solution");
beginner

ExpressJS Server Basics challenge

Build a small solution that uses ExpressJS Server Basics in Backend Development and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

// Backend Core Script for ExpressJS Server Basics
console.log("Setting up secure backend service for ExpressJS Server Basics");

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core expressjs server basics pattern before polishing the final output.

Solution

// Backend Core Script for ExpressJS Server Basics solution
console.log("Setting up secure backend service for ExpressJS Server Basics solution");
beginner

RESTful API Routes challenge

Build a small solution that uses RESTful API Routes in Backend Development and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

// Backend Core Script for RESTful API Routes
console.log("Setting up secure backend service for RESTful API Routes");

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core restful api routes pattern before polishing the final output.

Solution

// Backend Core Script for RESTful API Routes solution
console.log("Setting up secure backend service for RESTful API Routes solution");
beginner

JSON Request Handling challenge

Build a small solution that uses JSON Request Handling in Backend Development and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

// Backend Core Script for JSON Request Handling
console.log("Setting up secure backend service for JSON Request Handling");

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core json request handling pattern before polishing the final output.

Solution

// Backend Core Script for JSON Request Handling solution
console.log("Setting up secure backend service for JSON Request Handling solution");
beginner

Database Connections Setup challenge

Build a small solution that uses Database Connections Setup in Backend Development and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

import { connectDatabase } from "./db";
const db = await connectDatabase();
const results = await db.query("SELECT * FROM users;");
console.log(results);

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core database connections setup pattern before polishing the final output.

Solution

import { connectDatabase } from "./db";
const db = await connectDatabase();
const results = await db.query("SELECT * FROM users;");
console.log(results);
beginner

SQL Database Basics challenge

Build a small solution that uses SQL Database Basics in Backend Development and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

import { connectDatabase } from "./db";
const db = await connectDatabase();
const results = await db.query("SELECT * FROM users;");
console.log(results);

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core sql database basics pattern before polishing the final output.

Solution

import { connectDatabase } from "./db";
const db = await connectDatabase();
const results = await db.query("SELECT * FROM users;");
console.log(results);
beginner

NoSQL MongoDB Basics challenge

Build a small solution that uses NoSQL MongoDB Basics in Backend Development and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

import { connectDatabase } from "./db";
const db = await connectDatabase();
const results = await db.query("SELECT * FROM users;");
console.log(results);

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core nosql mongodb basics pattern before polishing the final output.

Solution

import { connectDatabase } from "./db";
const db = await connectDatabase();
const results = await db.query("SELECT * FROM users;");
console.log(results);
beginner

Mongoose ORM Integration challenge

Build a small solution that uses Mongoose ORM Integration in Backend Development and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

// Backend Core Script for Mongoose ORM Integration
console.log("Setting up secure backend service for Mongoose ORM Integration");

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core mongoose orm integration pattern before polishing the final output.

Solution

// Backend Core Script for Mongoose ORM Integration solution
console.log("Setting up secure backend service for Mongoose ORM Integration solution");
beginner

Authentication JWT Session challenge

Build a small solution that uses Authentication JWT Session in Backend Development and handles one normal case plus one edge case.

Input format

Use a short text value, array, query, or sample object depending on the topic.

Output format

Print, render, or return the processed result in a readable format.

Constraints

  • Keep the solution under 60 lines.
  • Use descriptive names.
  • Do not depend on hidden external services.

Starter code

// Backend Core Script for Authentication JWT Session
console.log("Setting up secure backend service for Authentication JWT Session");

Test cases

  • basic sample - valid processed result
  • empty or small sample - safe fallback result

Hint

Focus on the core authentication jwt session pattern before polishing the final output.

Solution

// Backend Core Script for Authentication JWT Session solution
console.log("Setting up secure backend service for Authentication JWT Session solution");