Encoders / Decoders
Transform & Convert Data
JSON, Base64, URL, CSV, YAML, XML and more — encode, decode, format and convert instantly.
JSON to PHP
Convert JSON data to PHP array syntax
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JSON Beautifier
Format and pretty-print JSON with syntax highlighting
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JSON Minifier
Compress JSON by removing whitespace and comments
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String Transformer
Transform strings: camelCase, snake_case, UPPER, lower and more
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URL Encoder
Percent-encode URLs and query parameters safely
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URL Decoder
Decode percent-encoded URLs back to readable form
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Base64 Encoder
Encode text or binary data to Base64 format
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Base64 Decoder
Decode Base64 strings back to plain text or binary
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Base62 Encoder
Encode numbers to compact Base62 alphanumeric strings
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Base62 Decoder
Decode Base62 strings back to their numeric value
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Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes
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Caesar Cipher
Encrypt and decrypt text with the classic Caesar shift cipher
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JWT Decoder
Decode and inspect JWT tokens — header, payload, claims
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CSV to JSON
Convert CSV spreadsheet data to JSON format
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YAML ⇄ JSON
Bidirectional conversion between YAML and JSON
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XML Formatter
Format and indent XML documents for readability
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Security / VAPT
Security & Vulnerability Testing
Clickjacking detection, HTTP header analysis, OWASP checks and email forensics.
Clickjacking Checker
Test if a site is vulnerable to clickjacking attacks
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HTTP Headers
Inspect HTTP response headers for security misconfigurations
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OWASP Top 10
Interactive reference for OWASP Top 10 web vulnerabilities
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Email Header Analyzer
Parse and analyze email headers for forensics and phishing detection
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Generators
Generate What You Need
Passwords, UUIDs, QR codes, barcodes, contributors and placeholder text.
Password Generator
Generate strong, secure random passwords with custom rules
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UUID Generator
Generate RFC 4122 v4 UUIDs in bulk instantly
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QR Generator
Generate QR codes from any URL, text or data
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Barcode Generator
Generate 1D barcodes in Code128, EAN, ISBN and other formats
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GitHub Contributors
Visualize and list contributors for any GitHub repository
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GUID Generator
Generate Globally Unique Identifiers (GUIDs) on demand
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Lorem Ipsum
Generate dummy placeholder text for layouts and mockups
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API & Dev Tools
Developer Productivity Tools
cURL, cron, regex, SQL, markdown, diff, Docker, Mermaid and more for everyday dev work.
cURL Describer
Paste a cURL command and get a plain-English explanation
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Cron Describer
Translate cron expressions into human-readable schedules
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Regex Tester
Test and debug regular expressions with live match highlighting
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SQL Formatter
Format and beautify SQL queries for readability
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API Response Tester
Test and inspect API responses and payment webhooks
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Environment Generator
Generate .env file templates for various project types
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Elasticsearch Tools
Build and test Elasticsearch queries and DSL expressions
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Markdown Editor
Write Markdown with live preview side by side
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Diff Checker
Compare two texts and highlight differences line by line
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Docker Guide
Comprehensive Docker commands reference and cheat sheet
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Mermaid Renderer
Render Mermaid diagrams: flowcharts, sequence, ERD and more
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NFC Reader
Read NFC tags directly in the browser via Web NFC API
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Text Sharer
Share text snippets via a shareable link instantly
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HTML Viewer
Paste HTML and preview it rendered live in the browser
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Network Protocols
Network Protocol References
Deep-dive references for HTTP, TCP, UDP, OSI model and networking fundamentals.
Network Protocols
Overview of common network protocols and their use cases
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HTTP Protocol
Complete HTTP protocol reference — methods, status codes, headers
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TCP Protocol
TCP protocol internals — handshake, flow control, reliability
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UDP Protocol
UDP protocol — connectionless, fast, datagram-based communication
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OSI Model
Interactive OSI 7-layer model reference with examples
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Text Tools
Text Analysis & Processing
Count words, characters, sentences and reading time instantly.
Database
Database References
Comprehensive guides and command references for popular databases.
Redis
Redis Command Explorer
Browse and search Redis commands by category with examples.
Python Toolkit
Python Library References
Interactive code references for popular Python libraries — requests, Flask, Pandas, OpenAI and more.
Requests Library
Python requests — HTTP GET, POST, headers, authentication
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urllib
Python's built-in urllib for URL handling and HTTP requests
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Flask API
Flask web framework reference — routes, blueprints, REST APIs
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Pandas
Pandas DataFrames — data manipulation, analysis, and I/O
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OpenAI API
Python OpenAI SDK — chat completions, embeddings, assistants
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Jupyter Notebooks
Jupyter tips, shortcuts and best practices for data science
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Prophet
Facebook Prophet library for time-series forecasting in Python
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Plotly
Create interactive charts and visualizations with Plotly
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Data Structures
Data Structure Visualizers
Interactive guides and visual explanations of fundamental data structures.
Data Structures
Overview of fundamental data structures and their trade-offs
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Array
Array data structure — indexing, operations, time complexity
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Linked List
Singly and doubly linked lists — traversal, insertion, deletion
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Stack
Stack (LIFO) — push, pop, peek with visual examples
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Queue
Queue (FIFO) — enqueue, dequeue, circular queue variants
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Information & Reference
Utilities & Reference Tools
IP lookup, timezone conversion, emoji picker, epoch converter, LeetCode helpers and more.
IP Address Tools
Look up your IP address, geolocation and subnet information
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Timezone Converter
Convert times between any two time zones in the world
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Emoji Picker
Search and copy any emoji — all categories, one click
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Epoch Converter
Convert Unix timestamps to human-readable dates and back
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LeetCode Commit Generator
Generate standardized git commit messages for LeetCode solutions
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All Available Tools
Complete alphabetical index of every DevDunia tool
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Blank Page
A clean blank page — use as a scratch pad or distraction-free canvas
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