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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. Highlight matches and quickly verify regex patterns.

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 IP address (IPv4/IPv6) instantly. Runs using a public API.

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.

IP Validator

Validate IPv4 and IPv6 addresses instantly online. Great for developers and network admins.

JSON Validator

Validate JSON strings instantly and catch syntax errors fast.

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 and copy the CSS for your elements.

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.

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 34 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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