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Generate Java interview questions by category, difficulty, and question type. Practice core Java, OOP, collections, concurrency, JVM, Spring Boot, REST APIs, microservices, testing, coding rounds, and more with a clean standalone question generator.

Generate Kafka interview questions instantly by topic, difficulty, and question type. Practice concepts, architecture, producers, consumers, partitions, offsets, replication, Kafka Streams, Connect, Schema Registry, troubleshooting, and real-world scenario questions.

Test, debug, and understand regular expressions instantly with live match highlighting, capture groups, replacement preview, pattern explanations, examples, and categorized regex practice questions.

Generate Spring Boot interview questions by category, difficulty, role, and question type. Includes thousands of prompts, hints, answer outlines, mock interview mode, favorites, study plans, and export options.

Generate SQL query practice questions by topic and difficulty. Includes schemas, sample data, hints, solutions, explanations, favorites, progress tracking, and light/dark mode.

Build, validate, explain, and copy cron expressions with presets, guided fields, next-run previews, and light/dark mode.

Format, validate, minify, repair, inspect, and convert JSON directly in your browser with a clean standalone JSON Formatter and Validator tool.