Developer
Format and validate JSON, encode and decode Base64, URLs and HTML entities, and generate UUIDs and slugs. Paste API responses and config files safely: none of it leaves your browser.
| Tool | What it does |
|---|---|
| JSON Formatter | Pretty-print, sort keys, browse as a tree, convert to YAML or CSV. |
| JSON Validator | Find the exact line and column of a JSON error, and fix it. |
| JSON Minifier | Strip whitespace from JSON and see how many bytes you saved. |
| Base64 Encoder / Decoder | UTF-8 safe Base64 encode and decode, URL-safe variant, files to Base64. |
| URL Encoder / Decoder | Percent-encode or decode URLs and values, and break a query string into a table. |
| HTML Entity Encoder / Decoder | Escape & < > " ' for HTML, or decode &-style entities back to text. |
| UUID Generator | Random v4 or time-ordered v7 UUIDs, up to 1,000 at a time. |
| Slug Generator | Turn titles into clean URL slugs, one per line. |
| Markdown Previewer | Live GitHub-flavoured Markdown preview, and copy the HTML. |