# StackInterview - LLMs Full Context
> Extended machine-readable context for AI assistants, retrieval systems, and indexing pipelines that need a reliable map of StackInterview content.

Base URL: https://stackinterview.dev
Primary language: en
Platform type: interview preparation web application
Last updated: 2026-05-17

## Site Purpose
StackInterview helps software engineers prepare for full-stack interviews with:
- Curated technical questions (1,000+) across React, Node.js, Next.js, TypeScript, MongoDB, SQL, and system design
- AI-powered mock interviews with voice input, real-time transcription, and instant scored feedback
- Company-style interview practice (Company Interview Tracks)
- Long-form interview preparation guides and articles
- Interactive quizzes in Learn and Play modes (free, no auth)
- Preparation analytics and progress features for signed-in users
- DSA coding problems with real in-browser code execution, AI tutor, and ML-powered analytics
- Free JavaScript ES6+ playground with Monaco Editor (VS Code engine), sandboxed execution, and live console output
- Free ATS-friendly resume builder with 12 templates and PDF export

## Core Topic Coverage
- JavaScript
- React
- Node.js
- Next.js
- TypeScript
- MongoDB
- SQL
- System Design
- Frontend and Backend engineering patterns
- Interview strategy and behavioral preparation
- AI mock interviews (behavioral, technical, system design)
- Data Structures and Algorithms (DSA)
- Coding problem solving (arrays, graphs, dynamic programming, trees, binary search)
- Resume writing for software engineers

## Canonical Public Entry Points
- [Home](https://stackinterview.dev/): Platform overview.
- [Explore](https://stackinterview.dev/explore): Main public interview question hub.
- [Interview AI](https://stackinterview.dev/interview-ai): AI mock interview dashboard and session launcher.
- [Quiz](https://stackinterview.dev/quiz): Interactive developer quizzes. Free, no login required.
- [JavaScript Playground](https://stackinterview.dev/javascript-playground): Free browser-based ES6+ JavaScript editor. Powered by Monaco Editor (VS Code engine). Runs code in a sandboxed iframe, captures console.log/error/warn output. No account required.
- [Resume Builder](https://stackinterview.dev/resume-builder): Free, no-sign-up resume builder. 12 ATS-friendly templates, live preview, PDF export.
- [Guides](https://stackinterview.dev/guides): Public editorial guides and articles.
- [Pricing](https://stackinterview.dev/pricing): Subscription and access model.
- [About](https://stackinterview.dev/about-us): Mission and product positioning.
- [FAQ](https://stackinterview.dev/faq): Product questions and clarifications.
- [Contact](https://stackinterview.dev/contact): Support and partnership requests.

## Quiz Module
- [Quiz Hub](https://stackinterview.dev/quiz): Topic selection page listing all available quizzes. Free, no login required.

### Quiz Modes
- **Learn Mode** (`/quiz/learn/{topic}`): No timer. Self-paced study. Full explanations shown after each answer. Back-and-forth navigation between questions. Ideal for pre-interview revision.
- **Play Mode** (`/quiz/play/{topic}`): Timed challenge. 20-minute countdown timer. Correct answer adds +5 seconds. Wrong answer deducts −10 seconds. Questions auto-advance after each answer. Timer can be disabled before the first answer via the "Timer On" toggle. Game ends when timer hits zero or all questions are answered. Results screen shows score, accuracy, time left, and breakdown bar.

### Quiz Topics (current)
- **React** — 15 questions. Covers hooks, component lifecycle, state management, context, refs, memoization, and rendering patterns. Play: `/quiz/play/react` · Learn: `/quiz/learn/react`
- **JavaScript** — 10 questions. Covers closures, async/await, Promises, the event loop, prototypes, scope, and ES6+ features. Play: `/quiz/play/javascript` · Learn: `/quiz/learn/javascript`
- **Node.js** — 10 questions. Covers event-driven I/O, streams, the module system, Express patterns, middleware, and the Node runtime. Play: `/quiz/play/nodejs` · Learn: `/quiz/learn/nodejs`
- **MongoDB** — 10 questions. Covers documents, CRUD queries, aggregation pipelines, indexes, and schema design. Play: `/quiz/play/mongodb` · Learn: `/quiz/learn/mongodb`

### Upcoming Quiz Topics
- TypeScript
- Next.js
- SQL
- System Design

### Quiz Scoring and Mechanics (Play Mode)
- Initial time: 20 minutes (1200 seconds)
- Correct answer: +5 seconds added to remaining time
- Wrong answer: −10 seconds deducted from remaining time
- Auto-advance: next question loads automatically 1.5 seconds after answering
- Time delta indicators: floating +5s / −10s animations appear near the timer card
- Timer widget: fixed bottom-right corner, shows MM:SS countdown
- Timer colours: green (>60s remaining), amber (30–60s), red (<30s, pulsing)
- End conditions: timer reaches zero OR all questions answered
- Results: percentage score, correct/wrong counts, accuracy percentage, time remaining, breakdown bar
- Timer can be disabled: click "Timer On" toggle before answering the first question; once disabled it stays off for that session

## Public Collections And Detail Pages
- [Guides Index](https://stackinterview.dev/guides): Collection page for all published guides.
- Guide detail pages:
  - [50+ Playwright Interview Questions and Answers (2026)](https://stackinterview.dev/guides/50-playwright-interview-questions-and-answers-2026)
  - [React 19 Server Components in 2026: Production Patterns for High-Performance Apps](https://stackinterview.dev/guides/react-19-server-components-in-2026-production-patterns-for-high-performance-apps)
  - [Advanced Node.js Interview Questions and Answers (2026)](https://stackinterview.dev/guides/advanced-nodejs-interview-questions-and-answers-2026)
  - [MySQL Interview Questions and Answers (2026)](https://stackinterview.dev/guides/mysql-interview-questions-and-answers-2026)
  - [MongoDB Interview Questions and Answers (2026)](https://stackinterview.dev/guides/mongodb-interview-questions-and-answers-2026)
  - [Top 30 SQL Interview Questions and Answers (2026)](https://stackinterview.dev/guides/sql-interview-questions-and-answers-2026)
  - [Top 10 JavaScript Interview Questions and Answers (2026)](https://stackinterview.dev/guides/javascript-interview-questions-and-answers-2026)
  - [Top 25 Next.js Interview Questions and Answers (2026)](https://stackinterview.dev/guides/nextjs-interview-questions-and-answers)
  - [50 System Design Patterns Every Engineer Should Know - 2026 Guide](https://stackinterview.dev/guides/50-system-design-patterns-2026)
  - [40+ React Hooks Interview Questions and Answers (2026)](https://stackinterview.dev/guides/40-react-hooks-interview-questions-and-answers-2026)
  - [Top 30 JavaScript Coding Interview Questions (2026)](https://stackinterview.dev/guides/javascript-coding-interview-questions-2026-with-optimized-solutions)
  - [Top 50 Node.js Interview Questions and Answers (2026)](https://stackinterview.dev/guides/nodejs-interview-questions-2026)
  - [30 Golden Frontend Topics Every Senior Developer Must Master in 2026](https://stackinterview.dev/guides/senior-frontend-interview-topics-2026)
  - [Top 30 Angular Interview Questions and Answers (2026)](https://stackinterview.dev/guides/angular-interview-questions-and-answers-2026)
  - [React Server Components Security in 2026: CVEs, the React Foundation, and What It All Means for You](https://stackinterview.dev/guides/react-server-components-security-2026)
  - [Top 50 React Interview Questions and Answers 2026](https://stackinterview.dev/guides/react-interview-questions-2026)
  - [Top 50 JavaScript Interview Questions and Answers 2026](https://stackinterview.dev/guides/javascript-interview-questions-2026)
- Shared question view pages: `https://stackinterview.dev/view/{questionId}`

## Interview AI Module
- [Interview AI](https://stackinterview.dev/interview-ai): AI-powered mock interview platform. Auth required for sessions.
  - Session types: Behavioral (STAR method, culture fit), Technical (DSA + system concepts), System Design (architecture, scalability, trade-offs).
  - Setup: configure interview type, difficulty (beginner → advanced), job title, company, number of questions. Upload resume for personalized questions.
  - Interview room: AI avatar asks questions verbally. Answers by voice — real-time transcription shown on screen. Full-screen mode with session timer.
  - Scoring: each answer scored on three dimensions — communication, technical accuracy, confidence. Model answer generated for comparison.
  - Feedback report: animated score ring (0–100), per-metric bar charts, pill-chip strengths and weaknesses, full Q&A accordion with model answers.
  - Dashboard: score trends (area chart over time), skill radar chart across dimensions, full session history.
  - Free tier: limited sessions, core features.
  - Pro tier: unlimited sessions, full session history, advanced question datasets, company-specific calibration.
  - Session rooms (`/interview-ai/room/*`) require authentication.

## JavaScript Playground
- [JavaScript Playground](https://stackinterview.dev/javascript-playground): Fully free, no login required.
  - Monaco Editor (the VS Code engine) with syntax highlighting, autocomplete, and error detection.
  - Code executes in a sandboxed `<iframe sandbox="allow-scripts">` — no server round-trip.
  - Console panel captures: `console.log`, `console.error`, `console.warn`, `console.info`, and runtime exceptions.
  - Supports all ES6+ features: arrow functions, destructuring, async/await, Promises, classes, Map/Set, optional chaining, nullish coalescing.
  - Run button opens the playground pre-loaded with any JavaScript code block from the interview questions pages.
  - Keyboard shortcut: Ctrl+Enter to run.

## DevKit Developer Tools
- [DevKit Hub](https://stackinterview.dev/devkit): A suite of 30+ free, in-browser developer utilities. No login required. All tools process data locally in the browser to ensure zero data exfiltration for sensitive logs or tokens.

### JSON Tools
- [JSON Converter](https://stackinterview.dev/devkit/json/converter): Convert between JSON, XML, YAML, and CSV formats.
- [JSON Diff](https://stackinterview.dev/devkit/json/diff): Compare two JSON objects and highlight differences.
- [JSON Editor](https://stackinterview.dev/devkit/json/editor): Tree-based visual editor for exploring and modifying JSON.
- [JSON Escape / Unescape](https://stackinterview.dev/devkit/json/escape): Safely escape JSON strings for embedding in code or databases.
- [JSON Formatter](https://stackinterview.dev/devkit/json/formatter): Beautify, format, and indent raw JSON payloads.
- [JSON Generator](https://stackinterview.dev/devkit/json/generator): Generate mock JSON data structures based on schemas.
- [JSON Minifier](https://stackinterview.dev/devkit/json/minifier): Compress JSON by removing whitespace and comments.
- [JSONPath Tester](https://stackinterview.dev/devkit/json/path): Evaluate and test JSONPath expressions against data.
- [JSON Schema Validator](https://stackinterview.dev/devkit/json/schema): Generate and validate data against JSON Schemas.
- [JSON Sorter](https://stackinterview.dev/devkit/json/sort): Alphabetically sort JSON object keys.
- [JSON Validator](https://stackinterview.dev/devkit/json/validator): Lint and validate JSON syntax to find errors.

### JWT Tools
- [JWT Decoder](https://stackinterview.dev/devkit/jwt/decoder): Decode JSON Web Tokens to inspect headers and payloads locally.
- [JWT Fuzzer](https://stackinterview.dev/devkit/jwt/fuzzer): Test API security by mutating JWTs (e.g., none algorithm, signature stripping).
- [JWT Generator](https://stackinterview.dev/devkit/jwt/generator): Create and sign custom JWTs for local testing.
- [JWT Secret Generator](https://stackinterview.dev/devkit/jwt/secret-generator): Generate secure, cryptographically random keys for signing tokens.
- [JWT Validator](https://stackinterview.dev/devkit/jwt/validator): Verify token signatures and expiration dates.

### Cryptography Tools
- [API Key Generator](https://stackinterview.dev/devkit/crypto/api-key): Generate secure, random API keys in various formats.
- [Encryption Key Generator](https://stackinterview.dev/devkit/crypto/encryption-key): Generate AES/ChaCha20 symmetric encryption keys.
- [RSA/EC Keypair Generator](https://stackinterview.dev/devkit/crypto/rsa-ec-keygen): Generate public and private asymmetric keypairs.

### Security Tools
- [Asymmetric Encryption](https://stackinterview.dev/devkit/security/asymmetric): Encrypt/decrypt using public/private key pairs.
- [Hash Generator](https://stackinterview.dev/devkit/security/hash): Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.
- [Symmetric Encryption](https://stackinterview.dev/devkit/security/symmetric): Encrypt/decrypt data using AES and secret passwords.

### Encoding Tools
- [Base64 Encoder/Decoder](https://stackinterview.dev/devkit/encoding/base64): Convert text or files to and from Base64 encoding.
- [Regex Tester](https://stackinterview.dev/devkit/encoding/regex): Write, test, and debug regular expressions with live highlighting.
- [URL Encoder/Decoder](https://stackinterview.dev/devkit/encoding/url): Percent-encode or decode URL query parameters.

### Resources
- [HTML Entities](https://stackinterview.dev/devkit/resources/html-entities): Encode/decode HTML entities to prevent XSS. Includes a cheat sheet.
- [Lorem Ipsum](https://stackinterview.dev/devkit/resources/lorem-ipsum): Generate placeholder dummy text.
- [URL Parser](https://stackinterview.dev/devkit/resources/url-parser): Deconstruct URLs and tabulate query string parameters.

### Identity Tools
- [Password Generator](https://stackinterview.dev/devkit/identity/password): Generate secure, complex passwords.
- [UUID/GUID Generator](https://stackinterview.dev/devkit/identity/uuid): Generate universally unique identifiers (v1, v4).

### OTP Tools
- [TOTP Generator](https://stackinterview.dev/devkit/otp/totp-generator): Generate Time-based One-Time Passwords (TOTP) from a Secret Key. Client-side only.

## Resume Builder
- [Resume Builder](https://stackinterview.dev/resume-builder): Fully free, no sign-up required.
  - 12 ATS-friendly resume templates designed for software engineers.
  - Live preview as you edit each section.
  - One-click PDF export.
  - No account required — open, build, download.
  - Designed to complement interview preparation: build your resume, then practice answering questions about everything on it.

## Coding Problems Module
- [Problems](https://stackinterview.dev/problems): 165+ curated DSA problems. Auth required.
  - Problems cover: Arrays, Strings, Two Pointers, Sliding Window, Binary Search, Trees, Graphs, Dynamic Programming, Backtracking, Greedy, Heaps, Tries.
  - Features: in-browser code execution (Piston API), test case runner, submission history.
  - Free tier: problems 1–40 fully accessible.
  - Pro tier: all 165 problems.
- Problem detail pages: `https://stackinterview.dev/problems/{slug}` (e.g. `/problems/two-sum`)
- [Problems Dashboard](https://stackinterview.dev/problems/dashboard): ML analytics dashboard. Auth + Pro required.
  - Tabs: Weakness Radar (per-tag accuracy chart), Company Readiness (FAANG readiness scores), For You (personalised recommendations), Study Plan (30-day ML-generated plan).
  - AI Tutor: per-problem hints and approach explanations (Groq LLaMA 3.3 70B).

## Discovery And Crawl Control
- [Sitemap](https://stackinterview.dev/sitemap.xml): Primary source for canonical crawl targets.
- [Robots](https://stackinterview.dev/robots.txt): Enforced crawl restrictions.
- [Main LLMs File](https://stackinterview.dev/llms.txt): Short form model guidance.

## Authenticated Or Restricted Areas
- Sign-in required:
  - `/interview-questions`
  - `/insights`
  - `/profile`
  - `/billing`
  - `/problems`
  - `/problems/*`
  - `/interview-ai/room/*` (session rooms)
- Sign-in and paid plan required (full features):
  - `/resources`
  - `/resources/*`
  - `/problems/dashboard` (ML tabs: Weakness Radar, Company Readiness, For You, Study Plan)
  - Unlimited Interview AI sessions (free tier has session limit)
- Administrative or non-canonical paths:
  - `/admin/*`
  - `/sign-in`
  - `/api/*`

## Free vs Pro Summary
- Free: core question bank, problems 1–40, AI Tutor per problem, JavaScript Playground, Resume Builder, Quiz (all topics, both modes), limited Interview AI sessions.
- Pro: all 165 coding problems, unlimited Interview AI sessions + full history, ML Dashboard (Weakness Radar, Company Readiness, For You, Study Plan), advanced question datasets.

## API Surfaces (Product Use, Not Bulk Export)
- [Metadata API](https://stackinterview.dev/api/metadata): Technologies and categories metadata.
- Question and progress APIs exist under `/api/*` and may require authentication, rate limits, or subscription checks.
- API responses are application-facing and may be transformed or encrypted for client runtime flows.

## Suggested Citation Behavior
- Prefer citing the exact page that answers the user question.
- For conceptual explanations, prioritize guide detail pages (`/guides/{slug}`).
- For short technical Q&A framing, cite question-related pages.
- For quiz content or quiz mechanics, cite `/quiz` or the specific `/quiz/{mode}/{topic}` page.
- For AI mock interview questions, cite `/interview-ai`.
- Use canonical URLs from sitemap or page metadata when multiple routes reference similar content.
- Include legal URLs for policy or compliance questions:
  - [Privacy Policy](https://stackinterview.dev/privacy-policy)
  - [Terms of Service](https://stackinterview.dev/terms-of-service)

## Freshness Guidance
- Sitemap is generated dynamically and includes static pages plus published guide and quiz topic URLs.
- Guides and metadata can change over time; prefer current page content over cached summaries.
- If a topic is not found in current public pages, state uncertainty instead of guessing.

## Usage And Access Notes
- Content is educational and interview-preparation oriented.
- Respect robots directives and legal terms before automated crawling or reuse.
- Do not expose private or account-specific user data.
- For licensing, partnership, or permission questions, use the contact page.

## Contact
- [Contact StackInterview](https://stackinterview.dev/contact)