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Developers Tools

Handy developer tools for testing, debugging, and generating code. Includes JSON formatters, regex testers, JWT decoders, minifiers, and CSS utilities.

Inside the Developers toolkit

Discover fast, browser-based utilities curated for developers workflows. Launch any tool to start using it immediately—no downloads, no sign-up, and results you can copy or export for your projects.

Popular picks include YAML Formatter, JWT Decoder, JWT Generator.

YAML Formatter
Format YAML, convert between YAML and JSON, and validate syntax instantly in your browser with offline support.
JWT Decoder
Decode JWT header and payload safely in your browser. Inspect claims and structure without sending tokens anywhere.
JWT Generator
Create signed JSON Web Tokens with customizable headers and payloads. Choose HS256, HS384, or HS512 HMAC algorithms and copy the ready-to-use JWT.
Cron Expression Builder
Visually craft cron expressions with presets, interval selectors, and quick toggles. Copy the expression and preview the next scheduled runs instantly.
Cron Parser
Parse cron expressions and preview next run times. Useful for devs managing scheduled tasks and crontab jobs.
HMAC Generator
Compute HMAC signatures with SHA-256, SHA-1, or MD5 using a secret key. Secure online hashing tool.
Regex Tester
Test and debug JavaScript regular expressions with live matches, highlighting, and quick feedback to refine patterns for validation, search, and replace.
Regex Pattern Builder
Compose regular expressions with guided toggles for character sets, anchors, quantifiers, and flags. Test against sample input instantly.
URL Parser
Parse a URL into protocol, host, path, query string, and hash. Quick online URL analyzer tool.
JS Minifier
Minify and compress JavaScript code instantly. Reduce file size with Terser-style compression and improve load speed.
CSS Minifier
Minify CSS online by removing whitespace, comments, and redundancy. Optimize your stylesheets quickly.
HTML Minifier
Minify HTML code instantly. Remove comments, extra spaces, and reduce file size for faster websites.
JSON Schema Validator
Validate JSON data against a schema. Catch errors instantly with fast, browser-based JSON schema validation.
IP Checker
See your current public IPv4 or IPv6 address instantly using a public API, useful for debugging network issues, VPNs, firewall rules, or support tickets.
Password Strength Checker
Quickly estimate password strength with visual feedback and tips.
HTML Formatter
Format and pretty-print HTML. Uses Prettier if available, with a small fallback.
JSON Diff
Compare two JSON structures and see a list of differences by path.
JSON Path Explorer
Run JSONPath-style queries in your browser. Inspect JSON payloads, test filters, and copy matching values instantly.
JSON Shape Flattener
Flatten nested JSON objects, rebuild dot-path maps, and merge payloads with conflict tracking.
.gitignore Builder
Select languages, frameworks, and tools to instantly build a tailored .gitignore file. Copy or download it for your next repo.
JSON.stringify Playground
Interactively explore JSON.stringify options. Try replacer arrays or functions, adjust indentation, and inspect replacer call traces.
JWT Inspector & Claims Diff
Decode two JWTs side by side, inspect their payloads, and highlight which claims are added, removed, or changed.
API Latency & Throughput Estimator
Estimate concurrent requests, bandwidth, and rough capacity from requests per second, latency, and payload size.
IP Validator
Validate IPv4 and IPv6 addresses instantly online. Great for developers and network admins.
JSON Validator
Validate JSON strings instantly, highlight syntax errors, and confirm formatting before you ship configs, APIs, or data files for production and debugging.
HTML Preview
Preview HTML code instantly in your browser. Great for testing and learning.
CSS → Tailwind
Paste CSS and get Tailwind utility classes for common properties (offline, heuristic).
Aspect Ratio Box
Generate aspect-ratio CSS plus the padding-bottom fallback snippet. Copy a ready-to-use responsive wrapper for any width and height.
Box Shadow
Design CSS box-shadows visually and copy the exact CSS.
Text Shadow
Design CSS text-shadow effects with adjustable offsets, blur, colors, and opacity. Preview typography and copy the CSS instantly.
Gradient Border
Generate gradient borders using CSS border-image or masking tricks. Customize stops, angles, widths, and instantly copy the CSS snippet.
Border Radius
Tune each corner radius visually and copy the CSS value.
CSS Clip Path
Create clip-path shapes visually with a live preview and copy the CSS for your elements, with presets for circle, ellipse, inset, and polygon masks fast.
CSS Grid Generator
Design CSS grid layouts by defining rows, columns, and named areas. Paint cells on the grid and export the CSS instantly.
CSS gradient → Tailwind
Convert CSS gradients into Tailwind utility classes. Supports linear, radial, and conic gradients with smart mapping to Tailwind syntax.
robots.txt Auditor
Paste your robots.txt file to inspect syntax errors, visualize user-agent coverage, and test whether URLs are blocked or allowed.
Meta Description & Title Length Checker
Check the length of your HTML title and meta description tags in characters and pixels, and preview how they might look in search results.
Schema.org Markup Generator
Generate JSON-LD schema.org markup for FAQPage, HowTo, and Article content using simple forms.
JavaScript/TypeScript Formatter
Format JavaScript or TypeScript instantly with clean indentation, readable spacing, and consistent line breaks.
CSS Formatter
Format CSS instantly with consistent indentation, tidy spacing, and readable line breaks for faster reviews.
SQL Formatter
Format SQL queries with readable line breaks and keyword highlighting for easier debugging and sharing.
XML Formatter & Converter
Format XML and convert XML <-> JSON with a clean, browser-only workflow for fast debugging and integration work.
TOML <-> JSON Converter
Convert TOML to JSON or JSON to TOML in your browser with a fast, lightweight parser for common config files.
SVG Optimizer & Cleaner
Optimize SVG files by removing metadata, comments, and extra whitespace for faster, cleaner assets.
SVG to React Component
Convert raw SVG markup into React-ready JSX with camelCased attributes and optional props support.
UTM Builder & URL Sanitizer
Build UTM-tagged URLs and strip tracking parameters from existing links to keep analytics clean and shareable.
File Checksum Generator
Generate file checksums in your browser to verify downloads, compare assets, and validate file integrity.

Developers tools FAQ

What can I do with developers tools?

Use this toolkit to handle common developers workflows such as yaml formatter, jwt decoder, jwt generator. Each utility opens instantly in your browser—no installs or accounts required.

How many developers tools does ToolHop provide?

This category currently includes 47 dedicated developers utilities with descriptive guides and shareable deep links. We expand the collection whenever we release new helpers for this workflow.

Can I bookmark or share these developers tools?

Yes. Each tool page has a unique URL so you can bookmark frequently used calculators and send teammates directly to the interface they need.

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