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Modern software engineering requires rapid debugging of JSON payloads, JWT authentication tokens, Unix epoch timestamps, color tokens, and regular expressions. ToolsHub Developer Tools are designed with a zero-trust architecture: every operation runs isolated in your browser's V8/JavaScript engine so that API keys, auth tokens, and sensitive payloads never leave your workstation.
Format, validate, and beautify JSON instantly in your browser. Free online JSON formatter with syntax highlighting and error detection.
Validate your JSON and get instant error feedback with line numbers. Free online JSON validator — processed in your browser.
Encode text to Base64 or decode Base64 to text instantly. Free online Base64 encoder and decoder — processed in your browser.
Generate random UUID v4 values instantly. Free online UUID generator — copy single or bulk UUIDs for your projects.
Decode JSON Web Tokens (JWT) client-side in browser memory. Inspect token headers, payload claims, expiration timestamps, and signature hashes without transmitting secrets.
Convert Unix epoch timestamps in seconds and milliseconds to human-readable UTC and local date formats. Features live ticking Unix clock and reverse date parsing.
Convert colors between HEX, RGB, HSL, and CMYK formats. Features interactive color picker, relative luminance calculation, and WCAG 2.1 accessibility contrast analysis.
Test regular expressions with real-time match highlighting, flag toggles, capture groups inspection, and predefined patterns for email, URL, and IP addresses.
Compress your CSS code to reduce file size and improve website loading speed. Strip out spaces, newlines, and comments.
Generate secure cryptographic hashes like SHA-256 and SHA-1 from text input. Instantly create digests for data integrity checking.
Generate complementary, triadic, analogous, and monochromatic color palettes from a base color mathematically.
Format minified or unreadable SQL queries into a clean, readable format with capitalized keywords and proper indentation.
Quickly convert configuration files between YAML and JSON formats with this simple developer utility.
Compress images (PNG, JPEG, WebP) directly in your browser. Adjust quality and size with instant preview.
Convert images between PNG, JPEG, WebP, and BMP. Fast, private, and 100% in-browser.
Convert SVG code or files to high-resolution PNG images directly in your browser.
Format, validate, decode, and test development artifacts locally without exposing sensitive secrets or credentials.
Decode JWTs, format internal JSON payloads, and generate RFC-compliant UUIDs without sending proprietary data to remote servers.
Track real-time Unix epochs, convert milliseconds to ISO 8601 strings, and generate cryptographically secure UUID v4 tokens.
Test regular expressions against real text with capture group inspection, or convert HEX/RGB/HSL color codes with WCAG contrast scoring.
Format, pretty-print, and validate complex nested JSON responses or sanitize invalid JSON syntax.
Inspect JWT headers and payload claims (sub, iss, exp, iat) and calculate remaining token lifetimes without exposing secrets.
Translate raw Unix timestamps from database logs into human-readable local times and UTC dates.
Convert design color values between HEX, RGB, and HSL, and ensure Level AA/AAA accessibility contrast.
Every tool in this category executes entirely within your browser memory. Your inputs, calculations, and data never leave your machine.
A comprehensive guide to digital color formats. Learn how HEX, RGB, HSL, and CMYK represent colors, and discover WCAG contrast rules for accessible web design.
A deep dive into RFC 7519 JSON Web Tokens. Learn the anatomy of Header, Payload, and Signature, standard claims (iss, exp, sub), and client-side debugging.
A developer's guide to text comparison algorithms. Learn how Git and diff checkers find line changes using the Longest Common Subsequence and Myers diff.
A beginner-friendly guide to regex. Learn character classes, quantifiers, anchors, flags (g, i, m), capture groups, and battle-tested validation patterns.
A developer's guide to Unix time and epochs. Learn how computers track time, convert seconds and milliseconds to ISO dates, and solve the Year 2038 problem.
Everything you need to know about UUID Version 4. Learn how 128-bit identifiers are generated, why collision probability is practically zero, and best practices for databases.
Yes! Unlike many online decoders that log payloads to remote servers, our JWT Decoder is 100% client-side. The token string is decoded using the browser's native atob/Base64Url parser entirely within your memory space.
We use the browser's native Web Cryptography API (`crypto.getRandomValues()`), guaranteeing cryptographically strong pseudo-random numbers that adhere to RFC 4122 specifications.
Yes. You can toggle global (g), case-insensitive (i), multiline (m), and dotAll (s) flags with real-time match highlighting and capture group extraction.