Developer
JWT decode, UUID, regex tester, timestamps, Markdown preview, and everyday helpers. This category currently lists 11 client-side tools on Toolverse by RS - inputs stay in your browser unless a tool explicitly says otherwise.
Tools in this category
- JWT Decode
- UUID Generator
- Regex Tester
- Timestamp Converter
- Markdown Preview
- HTML Email Preview
- Barcode Generator
- Gmail Email Preview
Developer catalog
| Tool | What it does |
|---|---|
| JWT Decode | Decode JWT header and payload in your browser - inspect claims without uploading tokens. |
| UUID Generator | Generate UUID v4 identifiers in bulk - uppercase and hyphenless options, fully client-side. |
| Regex Tester | Test JavaScript regular expressions against sample text - matches and groups, private in your browser. |
| Timestamp Converter | Convert Unix timestamps to dates and back - seconds, milliseconds, and ISO strings in your browser. |
| Markdown Preview | Preview Markdown as HTML in your browser - private drafts, no upload. |
| HTML Email Preview | Preview HTML email with estimated client compatibility - private sandbox, no upload. |
| Barcode Generator | Generate Code128, EAN, UPC, Code39, and QR barcodes as PNG in your browser. |
| Gmail Email Preview | Preview HTML email with Gmail-focused estimated compatibility checks - private browser sandbox. |
| Outlook Email Preview | Preview HTML email with Outlook-focused estimated warnings for Word-based rendering risks. |
| Email Dark Mode Tester | Test HTML email dark-mode risks with light/dark preview chrome and color heuristics - private and client-side. |
| Responsive Email Tester | Test HTML email at common device widths with estimated media-query guidance - private browser sandbox. |
- JWT Decode
Decode JWT header and payload in your browser - inspect claims without uploading tokens.
- UUID Generator
Generate UUID v4 identifiers in bulk - uppercase and hyphenless options, fully client-side.
- Regex Tester
Test JavaScript regular expressions against sample text - matches and groups, private in your browser.
- Timestamp Converter
Convert Unix timestamps to dates and back - seconds, milliseconds, and ISO strings in your browser.
- Markdown Preview
Preview Markdown as HTML in your browser - private drafts, no upload.
- HTML Email Preview
Preview HTML email with estimated client compatibility - private sandbox, no upload.
- Barcode Generator
Generate Code128, EAN, UPC, Code39, and QR barcodes as PNG in your browser.
- Gmail Email Preview
Preview HTML email with Gmail-focused estimated compatibility checks - private browser sandbox.
- Outlook Email Preview
Preview HTML email with Outlook-focused estimated warnings for Word-based rendering risks.
- Email Dark Mode Tester
Test HTML email dark-mode risks with light/dark preview chrome and color heuristics - private and client-side.
- Responsive Email Tester
Test HTML email at common device widths with estimated media-query guidance - private browser sandbox.