Devglan serves as a comprehensive hub where individuals can access a wealth of valuable resources, carefully selected and organized for their convenience. From engaging courses that offer in-depth learning experiences to insightful articles that provide valuable insights, and innovative projects that inspire creativity and practical application. By aggregating these resources in one place, we aim to empower learners to explore, discover, and expand their knowledge effortlessly.
We aim to empower learners to explore, discover, and expand their knowledge effortlessly.
Decode a JSON Web Token (JWT) online to view header and payload in readable JSON. Client-side decoding with no data
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Encrypt & decrypt PGP messages online using your browser. Generate PGP keys, encrypt plaintext, and decrypt message
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A powerful online regex tester, generator, and explainer. Validate regular expressions, visualize matches and captu
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AES encryption and decryption online tool for free.It is an aes calculator that performs aes encryption and decrypt
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Online free tool to encode plain text and image to Base 64 encoded string. It also provides solution to decode base
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Calculate string size in bytes and characters. Supports UTF-8, Unicode, emoji strings, JSON payload size, and datab
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Validate a JSON Web Token (JWT) by verifying its signature and claims like expiration, issuer, and audience. Secure
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A free tool to encrypt and decrypt file online. Secure any file with this encryption and decryption tool online.
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Encrypt and decrypt any sensitive text or string with this online tool for free. Protect any sensitive string using
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Online free tool to generate and compare Bcrypt hashed text and passwords.It uses Bcrypt algorithm internally to en
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Analyze your password strength instantly using our advanced password security tool. Get crack time, weakness detect
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Generate and verify MD5 hash online. Perform MD5 checksum verification, file integrity check, and hash match instan
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A secure online password vault that uses 100% browser-side encryption. Store and manage your passwords with full pr
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This tool can be used for RSA encryption and decryption as well as to generate RSA key online. Both public and priv
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Encrypt and decrypt files online using PGP. Secure client-side encryption with RSA keys, multiple recipients, and z
Explore Tool +Learn AI terminology with real-world examples using Spring Boot, Redis, and Elasticsearch. A complete guide for Java developers entering AI.
Read more +Learn how to build a production-grade semantic caching architecture using Redis, LSH hashing and Elasticsearch with Spring Boot. Includes architecture, performance optimization an
Read more +Learn how to build an AI-powered semantic search engine using Spring Boot and Elasticsearch. Generate embeddings, index documents, and perform vector search using Elasticsearch ML
Read more +Complete step-by-step tutorial to build semantic search in Elasticsearch 9 using multilingual-e5-small. Learn model deployment, dense_vector mapping, ingest pipelines, kNN search,
Read more +Complete Spring Boot Elasticsearch vector search example using kNN semantic search with filtering. Includes Maven dependencies, application.yml, ElasticsearchClient configuration,
Read more +A practical comparison of Argon2 vs bcrypt vs scrypt based on real implementation experience. Learn when to use each and how to migrate safely.
Read more +Learn the real differences between AES and ChaCha20, including nonce vs IV, performance trade-offs, and when to use each algorithm.
Read more +Vulnerabilities can be introduced through code, dependencies, build tools, or configuration files long before deployment. This is why security must be embedded directly into the d
Read more +Compare the 15 best enterprise loyalty software platforms in 2026—features, integrations, analytics, omnichannel tools, and who each is best for.
Read more +In this high-pressure environment, a new architectural paradigm has emerged to save the mobile economy. It is a shift from building isolated digital islands to constructing interc
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Practice Kafka interview questions with an interactive simulator. Attempt curate
Interview Questions+
Core Java interview questions and answers covering OOPs, JVM, collections, mult
Interview Questions+
Servlet interview questions and answers covering servlet lifecycle, request and
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Top Spring interview questions and answers covering Spring Core, Spring Boot, d
Interview Questions+
Hibernate interview questions with detailed answers on ORM, mappings, caching,
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REST interview questions and answers covering HTTP methods, status codes, RESTf
Interview Questions+
SOAP web services interview questions covering WSDL, XML, SOAP faults, security
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AngularJS interview questions and answers on directives, controllers, services,
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Manual testing interview questions covering SDLC, STLC, test cases, bug life cy
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Cucumber interview questions and answers covering BDD, Gherkin syntax, feature
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DBMS interview questions with answers covering normalization, indexing, transac
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Test your skills with Apache Kafka objective questions with answers and detailed
Objective Questions+
This Elasticsearch quiz contains carefully curated objective questions with corr
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Test your skills with prompt engineering objective questions covering LLM prompt
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Test your skills in cloud computing with carefully curated objective questions i
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Test your skills in Java multithreading with carefully curated objective questio
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This DBMS quiz contains carefully curated objective questions with correct answe
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Test your skills with Java system design objective questions with answers and de
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Test your skills with Kubernetes objective questions with answers and detailed e
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Practice medium to high difficulty Operating System MCQs with answers and explan
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Test your skills with GenAI and LLM engineering objective questions with answers
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Practice JavaScript objective questions with answers and clear explanations. Cov
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Practice cryptography objective questions with answers and detailed explanations
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Test your skills in Data Structures and Algorithms with carefully designed objec
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Test your skills with Spring Security objective questions with answers and detai
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Test your Spring Boot skills with advanced and interview-focused MCQs. Covers au
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Test your skills with Java 8 and beyond multiple-choice questions. Covers lambda
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Test your Core Java knowledge with topic-wise Java MCQs covering Strings, Excep
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Practice Servlet MCQs covering Servlet lifecycle, request–response model, filte
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Practice Spring Framework MCQs covering IoC, Dependency Injection, Spring Beans
Objective Questions+
Practice Hibernate MCQs with detailed explanations covering Session, caching, d
Objective Questions+
Practice AngularJS objective questions with detailed explanations. Covers ng-ap
Objective Questions+
Adobe After Effects is a digital visual effects, motion graphics, and compositing application developed by Adobe Systems and used in the post-production process of film making and television production.
Android is a mobile operating system based on a modified version of the Linux kernel and other open source software, designed primarily for touchscreen mobile devices such as smartphones and tablets.
Adobe XD is a vector-based user experience design tool for web apps and mobile apps, developed and published by Adobe Inc.
Affinity is the fastest, smoothest, most precise professional creative software.
Angular is a TypeScript-based open-source web application framework led by the Angular Team at Google and by a community of individuals and corporations.
Amazon Web Services offers reliable, scalable, and inexpensive cloud computing services. Free to join, pay only for what you use.
Artificial intelligence (AI) is the simulation of human intelligence processes by machines, especially computer systems. These processes include learning (the acquisition of information and rules for using the information), reasoning (using rules to reach approximate or definite conclusions) and self-correction.
Blockchain is a chain of blocks, connected sequentially using complex cryptographic logic.
Apache Spark is a unified analytics engine for big data processing, with built-in modules for streaming, SQL, machine learning and graph processing.
WordPress is a content management system based on PHP and MySQL that is usually used with the MySQL or MariaDB database servers but can also use the SQLite database engine.
ASP.NET is an open-source server-side web application framework designed for web development to produce dynamic web pages developed by Microsoft to allow programmers to build dynamic web sites, applications and services.
Ansible is the simplest way to automate apps and IT infrastructure. Application Deployment + Configuration Management + Continuous Delivery.
Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development.
Java is an object-oriented programming language and computing platform first released by Sun Microsystems in 1995.
Cucumber is a software tool used by computer programmers that supports behavior-driven development. Central to the Cucumber BDD approach is its plain language parser called Gherkin.
Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in HTML or XML (including XML dialects such as SVG, MathML or XHTML).
A database is an organized collection of data, generally stored and accessed electronically from a computer system. Where databases are more complex they are often developed using formal design and modeling techniques.
Bitcoin is a cryptocurrency. It is a decentralized digital currency without a central bank or single administrator that can be sent from user to user on the peer-to-peer bitcoin network without the need for intermediaries.
