Disclosure: I contribute to OpenNomos, the ecosystem behind this project.
There are hundreds of online dev tools out there. JSON formatters. Timestamp converters. URL encoders. Regex testers. Most of them are single-purpose, ad-riddled, and forgettable.
json.opennomos.com is different. It's a clean, two-in-one toolkit that handles the two things I do most often:
Timestamp Converter
Auto-detects seconds vs milliseconds. Two-way conversion between timestamp and human-readable time. Respects your local timezone. No dropdowns, no "select your format" nonsense — paste a number and it just works.
1700000000 → 2023-11-14 22:13:20 (UTC+8)
JSON Parser
Prettify, minify, locate errors. The error pinpointing is genuinely useful — instead of "invalid JSON at position 47" with no context, it shows you exactly where the problem is.
Why I Keep Coming Back
- No ads. Zero. Not even "sponsored by."
- No sign-up required. Just open and use.
- Open contribution. It's powered by OpenNomos, meaning developers can contribute tools and earn rewards.
- Fast. Clean UI, no loading spinners.
I've been using it daily for debugging API responses and converting timestamps in logs. It replaced three bookmarks with one.
What's your go-to online dev tool? Drop it in the comments — always looking for better alternatives.
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