About Our Developer Tools
Every ToolsFlash dev tool processes data locally with your browser's native engines — no server round-trips, no logging, no rate limits. That makes them safe for the things developers actually paste into tools: API responses with keys, JWT tokens, config secrets and brand colors.
What's in this category?
- JSON Formatter & Validator — beautify with 2/4-space or tab indentation, minify for production, and pinpoint syntax errors to the exact line and column.
- Base64 Encoder / Decoder — UTF-8 safe (emoji included) with a URL-safe variant for tokens and filenames.
- Color Picker & Converter — HEX ⇄ RGB ⇄ HSL live, plus a 9-step tint/shade scale and the complementary color, all copyable in one click.
- UUID & Lorem Ipsum Generator — bulk crypto-random UUID v4 (uppercase, no-dash and braces options) plus placeholder text by paragraphs, sentences or words.
- Markdown Previewer — live side-by-side Markdown → HTML with tables, fenced code, task lists and one-click Copy HTML.
Comparing two payloads or configs? Our Text Diff Checker pairs perfectly with the JSON formatter.