About Dev-Utilities
A collection of free, fast, browser-based utilities for developers. No account, no tracking, no data sent anywhere you didn't ask for.
Your data never leaves your browser
Every tool on this site that processes your input — JSON, YAML, regex patterns, cron expressions, iFrame previews — runs entirely inside your browser using JavaScript. Nothing is uploaded to a server. Nothing is logged. You can use these tools with production secrets, API keys, internal configuration files, and sensitive data without any privacy concern.
How the tools work
Dev-Utilities has two categories of tools, and it is important to understand the distinction because they have different privacy characteristics.
Client-side tools (fully private)
These tools execute entirely in your browser. When you paste JSON into the formatter or type a regex pattern, that data is processed by JavaScript running on your own machine — the same JavaScript engine that powers every website you visit. No network request is made. No data touches any server. Even if Dev-Utilities went offline, these tools would still work in a cached or locally hosted version.
Server-side tools (network requests made on your behalf)
A small number of tools require a server to function correctly. DNS propagation checking and SSL certificate inspection need to make outbound network requests from multiple geographic vantage points — something a browser cannot do due to CORS and network restrictions.
For these tools, your input (a domain name) is sent to the Dev-Utilities API server, which performs the lookup and returns the result. The domain name you enter is the only data transmitted. No personal information, credentials, or payload data is ever involved. These tools are clearly labelled.
What we don't collect
Dev-Utilities does not use cookies to track you across sessions. We do not collect any personally identifiable information. We do not sell data to third parties. We do not require an account, email address, or any form of registration to use any tool on this site.
We may use anonymous, aggregated analytics (such as page view counts) to understand which tools are most useful and to prioritise development. This data cannot be used to identify you as an individual. If we add advertising in the future, it will be contextual — based on the page you are reading, not on a profile built from your behaviour.
Why we built this
Developer tooling on the web is often fragmented. Some tools are buried inside large IDEs. Others are outdated, ad-heavy, slow to load, or require sign-up just to format a blob of JSON. We wanted a single, fast, always-available site where you can open a tool and immediately get to work — no friction, no bloat.
A secondary motivation was privacy. Developers frequently work with sensitive data: production configuration files, internal API responses, infrastructure hostnames, secrets. Sending that data to an unknown third-party server to format it is an unnecessary risk. Client-side processing eliminates the risk entirely.
The technology
The frontend is built with Next.js 15 (App Router), TypeScript, and Tailwind CSS. It is deployed on Vercel, with static pages pre-rendered at build time and served from the global edge network for minimal latency.
Tool logic lives in pure functions under src/lib/, completely decoupled from the UI framework. This means the logic is independently testable and portable. The YAML parser uses js-yaml. Human-readable cron descriptions use cronstrue. Everything else uses standard browser APIs.
Available tools
Contact & feedback
Found a bug, have a feature request, or want to suggest a new tool? Use the form below. We read every submission.