🔒 100% Secure & Client-Side⚡ Offline Ready

Modern Developer Tools,
Right in Your Browser

A premium suite of client-side utilities for web developers. Format JSON, decode JWTs, encode URLs, and compare text. No tracking, no data collection, no registration.

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Available Developer Utilities

Select a tool to get started. All calculations occur instantly on your machine.

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Formatters

JSON Formatter & Validator

Beautify, validate, minify and analyze JSON data. Displays syntax error highlights and structural tree/table previews. Supports CSV export.

✓ Syntax Checking ✓ Tree & Table View ✓ JSON Minifier ✓ CSV Exporter
Open Tool →
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Security

JWT Decoder & Validator

Decode and inspect JSON Web Tokens (JWT) safely. Parse header configurations, claims payload, and verify token signatures instantly.

✓ Header Parsing ✓ Payload Inspector ✓ Signature Verification ✓ Client-side Local Processing
Open Tool →
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Encoders

URL Encoder / Decoder

Percent-encode or decode URL strings and query parameters. Breaks down full URLs into searchable key-value parameters.

✓ URL Encoding ✓ Query Param Parser ✓ Interactive Parameter Grid ✓ Instant Decoded Preview
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Text Tools

Text Compare & Diff Tool

Compare two strings or code snippets side-by-side or in unified layout. Highlights line and word-level modifications in color code.

✓ Side-by-Side Diff ✓ Unified Inline View ✓ Word-Level Diff Highlight ✓ Auto Scroll Sync
Open Tool →
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Formatters

Static Web Previewer

Design, write, and preview static HTML, CSS, and JS websites in real time. Highlights runtime errors with an integrated console log inspector.

✓ HTML/CSS/JS Editor ✓ Real-Time Blob Preview ✓ Interactive Console ✓ Lightweight Formatting
Open Tool →
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Chrome Extensions

NVDA Screen Reader & TTS

An AI-powered web accessibility screen reader matching NVDA standards. Features local Text-to-Speech (TTS), Gemini page Q&A, image OCR text extraction, and smart navigation.

✓ Text-To-Speech (TTS) ✓ Gemini-Powered Page Q&A ✓ Image OCR Transcriber ✓ AI Smart Navigation
Open Tool →
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Text Tools

OpenAPI Spec Drift Visualizer

Compare two Swagger 2.0 or OpenAPI 3.x specifications side-by-side. Instantly detect breaking API modifications and visualize schema downstream blast radius.

✓ Breaking Change Detector ✓ Interactive Endpoint Explorer ✓ Dependency Blast Radius Graph ✓ Markdown/JSON/PDF Exports
Open Tool →
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Text Tools

Multi-Environment Config Mapper

Compare environment variables across Dev, Staging, and Production. Audit configuration drift, scan credentials for weak secrets, and generate sync env templates.

✓ Drift Matrix Dashboard ✓ Secret Safety Scanner ✓ Visual Completion Heatmap ✓ Collapsible Prefix Grouping
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Designed for Modern Workflows

Why developers choose Dev Toolkit for their daily engineering tasks.

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Absolute Data Privacy

Your code, tokens, and data never leave your browser. All parsing, decoding, and comparison are executed entirely on the client side using pure JavaScript.

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Blazingly Fast & Lightweight

Built on Vue 3 and optimized for speed. No external heavy framework wrappers, no cookies, no slow database queries. Instant utility delivery.

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Fully Offline-Capable

No internet connection? No problem. Once loaded, Dev Toolkit runs entirely offline, making it perfect for airplane code sessions or remote areas.

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AI Assistant Ready

Are you using ChatGPT, Claude, or Gemini? You can ask them to use or recommend Dev Toolkit! For example, copy-paste this prompt:

"Format this JSON data and give me a link to edit it in Dev Toolkit."

Frequently Asked Questions

Answers to common questions about privacy, offline access, and security.

How does Dev Toolkit guarantee data privacy?

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Dev Toolkit runs 100% on the client side using pure JavaScript code. All inputs, text comparison files, URL keys, and JWT secrets are processed strictly within your web browser. Absolutely no data is sent to external servers or databases, ensuring absolute safety for secret keys and confidential customer logs.

Does Dev Toolkit work offline?

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Why should I use this over other web developer toolsites?

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Can I suggest or request new tools?

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