Secure In-Browser Developer Tools (JSON, JWT, Subnets, Cron & Code Graphics)
Format payloads, calculate subnets, test cron schedules, and inspect tokens locally without exposing backend credentials to cloud loggers.
Safe for Proprietary Code
Zero risk of leaking customer PII, internal table schemas, or bearer tokens to third-party databases.
Offline PWA Support
Install DocSwift as a desktop app and debug JSON, subnets, and regex while flying or offline.
RFC Standard Compliance
Built strictly to RFC 8259 (JSON), RFC 7519 (JWT), and RFC 4648 (Base64/Base58) technical specifications.
Overview & Client-Side Technical Architecture
Software engineers and DevOps architects handle sensitive production tokens, internal database schemas, proprietary algorithms, and network subnet designs daily. Pasting confidential bearer tokens or SQL queries into public cloud converters creates severe security audit liabilities.
Preventing Credential Leaks in Production Workflows
Public developer websites often log incoming HTTP payloads in web server access logs, third-party analytics trackers, or browser extension memory. If an engineer pastes an active production JWT bearer token or API key, an attacker can hijack administrative sessions.
DocSwift DevTools run entirely through native JavaScript, Web Crypto, and Web Workers. Network inspection in DevTools reveals zero outgoing network packets during token decoding, hash generation, and JSON formatting.
Comprehensive DevOps & Frontend Engineering Suite
From computing complex IPv4 / CIDR netmasks for AWS VPC provisioning to translating cryptic 5-field crontabs into plain English sentences, our utilities eliminate friction from daily engineering workflows.
Frontend engineers can convert SVGs to production-ready React JSX, calculate fluid typography scales, inspect WCAG color contrast ratios, and turn code snippets into beautiful presentation graphics for documentation.
Available Developer & Web Engineering Utilities (65 Tools)
Select any tool below to launch it instantly in your browser with zero configuration.
JSON Formatter
Format, validate, and minify JSON data with custom indentation (2 or 4 spaces). Catch syntax errors in real-time. 100% private.
Base64 Tool
Encode plain text or images to Base64 Data URI strings, or decode Base64 back into readable text. Fast, secure, and client-side.
URL Encoder
Encode query parameters and special characters into standard percent-encoded URLs (%20, %2F), or decode them back to plain text.
Markdown Editor
Write and convert Markdown syntax to clean HTML with real-time live split-screen preview. 1-click copy clean HTML code.
Hash Generator
Generate secure cryptographic hashes online. Compute SHA-1, SHA-256, SHA-384, SHA-512, and MD5 hashes instantly in your browser.
UUID Generator
Generate cryptographically secure random UUID v4 / GUID identifiers in bulk. Customizable hyphens, uppercase, and JSON format.
Epoch Converter
Convert Unix epoch timestamps (seconds and milliseconds) to human-readable dates and convert dates back to Unix timestamps in UTC & local time.
CSV ⇄ JSON Converter
Convert CSV spreadsheets to JSON arrays and parse JSON objects into clean CSV spreadsheets. Handles delimiters, custom quotes, and downloads instantly.
RegEx Tester
Test and debug JavaScript regular expressions online with live match highlighting, capture group inspection, and common pattern presets (email, phone, URL).
JWT Debugger
Decode and inspect JWT headers, payloads, and claims directly in your browser. Verify expirations and timestamps without sending confidential tokens to third-party servers.
SQL Formatter
Format and beautify SQL queries with custom indentation and uppercase keyword standards. Supports PostgreSQL, MySQL, SQLite, and SQL Server with zero server uploads.
Dummy Data Generator
Generate realistic mock datasets for frontend, API, and database testing. Export names, emails, phone numbers, and addresses in JSON, CSV, or SQL format.
cURL Converter
Convert cURL commands to JavaScript Fetch, Axios, Python Requests, and Go net/http code. Parse headers, cookies, and JSON payloads with zero server uploads.
SVG to JSX
Convert raw SVG code into clean React TypeScript (TSX) and JavaScript (JSX) components. Automatically fixes kebab-case attributes, class to className, and forward props.
Glassmorphism UI
Design frosted glass UI cards with backdrop-blur, translucency, and multi-layered box shadows. Generate clean Vanilla CSS and Tailwind CSS classes.
Cron Generator
Generate and translate 5-part cron schedule expressions into plain English. View next execution times and choose from common devops scheduling presets.
PX to REM & clamp()
Convert PX to REM and EM based on your root font size. Generate modern fluid responsive typography using CSS clamp() with real-time viewport simulation.
HTML Entities
Encode special characters into HTML entities (<, >, &, ©) or decode entities back into plain text. Supports named, decimal, and hex entities.
JSON to TypeScript
Convert JSON objects into clean TypeScript interfaces, types, and Zod schemas with nested type inference. 100% private in-browser generation.
Chmod Calculator
Calculate Linux chmod permissions visually with octal (755, 644, 777) and symbolic representations. Generate terminal commands with custom paths and -R flag.
Flexbox Playground
Visually arrange flexbox containers with justify-content, align-items, flex-direction, and gap controls. Generate clean Vanilla CSS and Tailwind CSS classes.
CSS Animations
Design smooth CSS keyframe animations (bounce, pulse, shake, spin, float). Configure custom cubic-bezier easing curves and export pure CSS & Tailwind configs.
Favicon Generator
Create multi-resolution favicon and web app icon packages (16x16, 32x32, 180x180 Apple Touch, 192x192 & 512x512 Android) with site.webmanifest and instant ZIP download.
Git Helper
Interactive Git command generator for common workflows: undoing commits, squashing history, recovering deleted branches, and creating clean pull requests.
SVG Optimizer
Optimize and minify SVG vector images online. Remove bloated editor metadata, round float coordinates, strip comments, and reduce file sizes by up to 70%.
Contrast Checker
Test color contrast ratios according to WCAG 2.1 accessibility guidelines. Instant pass/fail validation for normal text, large headings, and UI components.
Box Shadow Maker
Design realistic multi-layer box shadows and vibrant neon glows. Adjust blur, spread, offset, and opacity with instant CSS and Tailwind class export.
User-Agent Parser
Analyze and decode HTTP User-Agent strings. Detect browser name, version, rendering engine (Blink/Gecko/WebKit), OS, device type, and automated bot crawlers.
Gradient Studio
Create multi-stop CSS gradients with visual angle controls and curated designer palettes. Copy pure CSS and Tailwind CSS background classes instantly.
JSON to Zod
Generate Zod validation schemas, inferred TypeScript types, and pure interfaces from JSON payloads or API responses. Supports datetime, email, and nested objects.
Meta Tag Generator
Create perfect SEO meta tags, OpenGraph tags, Twitter Card cards, and Google JSON-LD structured data schemas with real-time social card preview.
Visual Regex
Build, test, and debug regular expressions visually. Includes pre-tested patterns for emails, phone numbers, Turkish TC Kimlik, URLs, and IPv4 addresses.
JSON Diff
Compare two JSON objects or API responses side by side. Highlights added, removed, and modified keys with color coding and 100% in-browser privacy.
Fluid Typography
Calculate smooth, responsive fluid font sizes with CSS clamp(). Linear viewport interpolation between mobile and desktop without media query breakpoints.
HTML Formatter
Format messy HTML markup with clean 2-space indentation or minify production code by stripping comments and redundant whitespace. 100% private in browser.
JWT Generator
Create signed or unsigned JSON Web Tokens for API testing and local auth mocking. Custom claims, timestamps, and HMAC signing with zero server uploads.
Color Blindness Sim
Simulate how images, logos, and UI palettes appear to people with red-green, blue-yellow, and total color blindness using SVG color matrices.
Bulk UUID
Generate up to 500 random UUIDv4 or time-ordered UUIDv7 identifiers in bulk. Lowercase, uppercase, quotes, comma, or newline delimiters with 1-click export.
Clip Path Generator
Visual CSS clip-path generator. Create triangles, hexagons, stars, bubbles, and custom polygon shapes with draggable points and 1-click CSS code.
TSV to JSON
Convert Tab-Separated Values (TSV) from Excel or Google Sheets to structured JSON and back. Automatic type casting, minify toggle, and zero server uploads.
CSS Grid Builder
Visual interactive CSS Grid generator. Configure columns, rows, track sizes (fr, px, auto), and gap spacing with live preview and instant CSS/HTML copy.
CSS Triangle
Generate pure CSS triangles using transparent border hacks. Create tooltips, speech bubbles, and arrows in 8 directions with instant CSS copy.
URL Parser
Deconstruct and analyze complex URLs. Inspect protocol, hostname, path, and edit query string parameters in real time with 100% in-browser privacy.
Neumorphism CSS
Generate modern Neumorphism (Soft UI) CSS box-shadows and gradient backgrounds. Flat, concave, convex, and inset pressed styles with 1-click CSS copy.
YAML to JSON
Convert YAML to JSON and JSON to YAML online. Fast, browser-based parser for Kubernetes manifests, Docker Compose, and CI/CD pipelines with zero server uploads.
HTML Table Builder
Interactive visual spreadsheet editor to build HTML tables and Markdown tables. Add rows, columns, striped styling, and copy clean code instantly.
String Obfuscator
Obfuscate JavaScript strings, API keys, and sensitive tokens using CharCode arrays, Hex escapes, Unicode encoding, and Base64 wrappers.
Fancy Border Radius
Create organic blob shapes and fancy CSS border-radii with 8-point percentage controls. Generate lemons, water drops, and pebble shapes with 1-click CSS copy.
SQL to JSON
Convert SQL INSERT INTO queries and dumps into structured JSON arrays of objects. Automatic number, boolean, and null casting with 100% in-browser privacy.
SVG Pattern Maker
Create seamless repeating SVG background patterns (Dots, Grid, Diagonal Stripes, Zigzag, Waves). Copy SVG code or CSS data-uri with 1-click.
Text Shadow 3D
Visual multi-layer CSS text-shadow generator. Design 3D extruded text, neon glows, vintage retro offsets, and copy clean CSS code instantly.
HTML Minifier
Minify and compress HTML to reduce file weight, strip comments, and collapse whitespace, or beautify messy HTML with 2-space clean indentation.
DMARC & SPF Maker
Generate compliant DNS TXT records for DMARC policies (reject, quarantine) and SPF authorizations (Google Workspace, Microsoft 365, SendGrid) with 1-click copy.
Cubic Bezier Easing
Visual CSS cubic-bezier timing function generator. Customize P1 and P2 control points with live animation test runner and 1-click CSS transition copy.
Color Shades Generator
Generate a complete 10-step Tailwind CSS color ramp (50 to 950) from any single brand color. Copy Tailwind theme config or CSS custom variables with 1-click.
JSON Schema Generator
Convert JSON payloads into standard JSON Schema Draft-07 definitions. Infers object properties, arrays, primitive types, and required fields with 1-click copy.
CSS Button Generator
Generate modern CSS buttons with hover micro-interactions, gradient glows, 3D push depths, and glassmorphism. Copy production-ready CSS code instantly.
Markdown to CSV
Convert GitHub and GitLab Markdown tables (| col | col |) into clean CSV or Excel-compatible TSV spreadsheets with 1-click download and copy.
Code to Image
Transform your source code into gorgeous presentation-ready images with macOS window frames, syntax highlighting, custom gradients, and 1-click PNG/SVG export.
AI Prompt Optimizer
Turn vague, one-line prompts into structured, highly effective prompts with expert personas, strict constraints, context variables, and zero server logging.
CIDR Subnet Calculator
Calculate Network ID, Broadcast Address, Usable Host Range, Total Usable IPs, and Binary Subnet Masks for any IPv4 CIDR prefix (/8 to /32).
Mesh Gradient Studio
Create multi-color radial mesh gradients for modern SaaS hero banners and landing pages. Copy production-ready CSS and Tailwind code with live preview.
Base58 Bitcoin Encoder
Encode and decode Base58 strings locally for Bitcoin addresses, Solana public keys, and IPFS CIDs. 100% private with zero cryptographic leak risks.
Cron Expression Explainer
Paste any 5-field cron expression (e.g., */15 9-17 * * 1-5) and get an instant plain English human explanation along with upcoming execution dates.
JWT Payload Editor & Mint
Edit JWT payload JSON claims, adjust expiration timestamps (exp), simulate admin roles, and generate test signed or unsigned tokens in your browser.
Recommended Step-by-Step Guides
How to Format, Prettify, and Validate JSON Data Safely Online
Fix minified API responses and debug syntax errors without sending proprietary customer data to external servers.
How to Inspect & Verify JWT Tokens Locally Without Leaking Credentials
A comprehensive developer tutorial on decoding JSON Web Tokens (Header, Payload, Signature) safely in local browser memory.
Linux File Permissions Demystified: Chmod 755, 644 and 777 Explained
The complete beginner-to-advanced reference for Unix file permission bits, octal calculation, read-write-execute rights, and server security hardening.
The Complete Guide to Cron Expressions: Syntax, Schedules & Examples
Learn the 5-field cron syntax (minute, hour, day of month, month, day of week) and build flawless recurring automation schedules for Linux and cloud tasks.
Developer & Web Engineering Utilities FAQ
Can I safely paste production JWTs into the JWT Debugger?
Yes. The JWT Debugger unpacks Base64URL claims purely using local browser memory without transmitting any data over the web.
Which programming languages are supported for syntax formatting?
We support JSON, SQL, TypeScript, JavaScript, HTML, CSS, YAML, Markdown, and Unix shell scripts.