About this Dev Toolbox
Coding always comes with a few frequent mini-tasks: checking a timestamp, formatting some JSON, Base64 encoding/decoding, generating a UUID, converting number bases. Installing IDE plugins is heavy, and online tools raise data-leak worries.
This toolbox puts all five on one page: everything runs locally in your browser, no network, no uploads, no trace left when you close the tab — paste API responses, tokens or configs with confidence.
How to use
- Switch tabs: timestamp / JSON / Base64 / UUID / radix
- Paste or type content, then click the matching button
- Click "Copy result" in the result area to take it away in one click
FAQ
Seconds or milliseconds — how to tell?
A 10-digit number is in seconds, 13 digits in milliseconds — this tool detects it automatically. The current second-level timestamp updates live as soon as the page opens.
What happens when JSON validation fails?
It shows the exact syntax error and its position (which line), so you can quickly spot the extra comma or missing quote.
Garbled Chinese after Base64 decode?
This tool handles Chinese, English and emoji as UTF-8 with no garbling. If Base64 from elsewhere shows mojibake, the other side probably used a non-UTF-8 encoding.
Related:Timestamp · JSON format · Base64 online · UUID generator · Radix Convert · Developer tools online