Developer & Website Tools
Format, validate, encode, convert, and generate assets for websites and code workflows.
A workflow cluster for web developers, technical marketers, builders, and anyone cleaning or generating structured data.
What this suite is for
Developer & Website Tools groups together the parts of Tolyo.app that support technical work: structured text conversion, CSS helpers, regex testing, JSON formatting, encoders, and utility generators.
Featured tools
Start with the most-used tools in this suite, then branch into the full list below if you need a more specific workflow.
What this suite is for
Developer & Website Tools groups together the parts of Tolyo.app that support technical work: structured text conversion, CSS helpers, regex testing, JSON formatting, encoders, and utility generators.
- Format and validate JSON before shipping or debugging.
- Convert CSV and JSON back and forth.
- Generate CSS gradients, clip paths, and shadows.
- Test regex patterns and encode or decode text safely.
Common workflows
These are the kinds of tasks people typically chain together when they browse this part of Tolyo.app.
- Clean structured data before importing or exporting.
- Generate front-end values for gradients, layout, and styling.
All Developer & Website Tools
Browse every tool assigned to this suite. These links are also used across the site to strengthen internal linking between related tasks.
JSON Formatter
Pretty-print & validate JSON.
JSON → CSV
Turn JSON data into CSV files.
CSV → JSON
Convert CSV files into JSON arrays.
Regex Tester
Test and debug regular expressions.
UUID Generator
Generate v4 UUIDs securely.
CSS Gradient Generator
Design linear/radial gradients with CSS output.
CSV Cleaner + Formatter + Deduplicator
Clean messy CSV files, remove duplicates, and export a normalized result.
Robots.txt Tester + Generator
Fetch, test, validate, and generate robots.txt files with matched-rule explanations.
Test Robots.txt Rules
Check if a URL is blocked or allowed for Googlebot and other crawlers.
Generate robots.txt
Create a clean robots.txt file visually with templates and export tools.
Validate / Inspect robots.txt
Inspect syntax, duplicate groups, and risky crawler rules before deployment.
Box Shadow Generator
Create CSS/Tailwind box shadows with preview.
Border Radius Generator
Generate CSS border-radius values with live preview.
Tailwind Gradient Helper
Convert CSS gradients into Tailwind classes.
Flexbox Playground
Visualize and generate CSS/Tailwind flexbox code.
CSS Grid Builder
Design and export responsive grid layouts.
CSS clip-path Maker
Create rectangles, circles, pills with linear/radial/conic gradients and copy the CSS in one click.
Color Converter
HEX ↔ RGB ↔ HSL ↔ CMYK.
Markdown ↔ HTML
Convert Markdown to HTML and back.
Related suites
If you are moving across nearby workflows, these suites are usually the next most relevant places to continue.
Text & Writing Tools
Count, compare, clean, rewrite, and organize text for writing workflows.
Design & Creative Tools
Create quick graphics, vectors, gradients, and visual assets for fast creative workflows.
QR & Scanner Tools
Generate, style, and scan QR codes for links, contacts, Wi-Fi, and more.
FAQ
Quick answers about this tool suite and how to use it.