About DevFox
DevFox is a collection of practical browser-based tools for developers: formatters, validators, encoders, decoders, inspectors, and generators designed for everyday debugging work.
The site is created and maintained by Giorgos Kostas, a Senior Software Engineer with experience in backend systems, Stripe integrations, BigQuery, React Native, developer tooling.
DevFox exists because small engineering tasks often take longer than expected. A malformed JSON payload, unclear JWT claim, timestamp mismatch, escaping issue, or URL encoding bug can interrupt a larger task for far too long. The tools and articles here focus on making those checks visible, explainable, and quick.
Whenever possible, tools run in the browser so pasted input stays on your device. Server-backed tools are used only where the task requires network access, such as inspecting a public URL or TLS certificate.
Editorial approach
- Examples should reflect real developer workflows, not generic placeholders.
- Tool pages should explain common failure modes and edge cases.
- Privacy behavior should be visible where sensitive input is likely.
- Thin or duplicate pages are improved or noindexed until they are useful.