DevDunia

Privacy-first • Client-side • No signup

Developer & Pen Testing Tools
at your fingertips

Where development meets security. 100+ free utilities for developers and VAPT professionals—JSON, Base64, JWT, clickjacking testing, and more. Everything runs in your browser; your data never leaves your device.

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100+ tools Privacy-first Lightning fast 100% free Open source

Built for

Developers, security pros, educators

One platform for encoding, testing, generating, and learning—whether you ship code, run VAPT, or teach.

Developers

JSON/XML formatting, Base64, JWT decode, UUIDs, regex tester, cURL converter, SQL formatter, env generator—everything for daily dev workflows.

VAPT & security

Clickjacking checker, HTTP headers analysis, OWASP Top 10 reference, email header analyzer, hash generator—client-side so sensitive data stays local.

Educators & students

Data structures guides, network protocols (HTTP, TCP, UDP, OSI), security awareness with OWASP—safe, in-browser experimentation.

Tool categories

100+ Developer and VAPT tools

Encoders, VAPT tools, generators, API & dev utilities, network guides, database tools, and Python toolkit.

Encoders / Decoders

JSON, Base64, Base32, URL, JWT, CSV⇄JSON, XML, Hash

VAPT & security

Clickjacking, HTTP headers, OWASP Top 10, Email headers

Password, UUID, QR, GUID, Lorem Ipsum

Dev & API tools

cURL, Cron, Regex, SQL, Diff, Mermaid, Markdown

Network protocols

HTTP, TCP, UDP, OSI model

PostgreSQL, Redis

Requests, Flask, Pandas, OpenAI, Jupyter, Prophet, Plotly

IP tools, Docker, Data structures, Emoji picker

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How it works

Your data never leaves your browser

All 100+ tools run entirely client-side. No server-side processing, no uploads, no tracking. Use DevDunia online or run it locally for full offline control.

Zero server processing

JSON, Base64, hashes, JWT—everything runs in JavaScript in your browser. No API calls for tool logic.

Lightning fast

No network round-trips. Results appear instantly. Works great offline once loaded.

Self-host anytime

Clone the repo and run locally (e.g. python -m http.server 8000) for air-gapped or private use.

Open source

Contribute to DevDunia

DevDunia is 100% free and open source. Add a new tool, improve docs, or fix a bug—we welcome PRs and recognize contributors. No build process; just HTML, CSS, and JS.

View on GitHub Contribution guide