dev-utils

🧰 DevUtils Utilities Catalog & Reference

This document provides a comprehensive reference for all 18 offline developer and QA utilities available in DevUtils.

Every utility runs 100% locally on your desktop machine, ensuring sensitive credentials, tokens, customer PII, and production payloads never touch the internet.

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Quick Navigation

• 1. Data & Formatting Utilities
  • JSON Formatter & Minifier
  • JSON ↔ CSV Converter
  • XML Formatter & Validator
  • SQL Formatter & Query Beautifier
• 2. Security, Tokens & Cryptography
  • Offline JWT Token Inspector
  • Cryptographic Hashes & HMAC Generator
  • Bcrypt & Password Generator
• 3. Encoders & Decoders
  • Base64 / URL / HTML Entity Codec
  • Hex ↔ UTF-8 Text Converter
• 4. Testing & QA Utilities
  • Regex Tester & Pattern Debugger
  • Text Diff & Payload Comparator
  • UUID & GUID Batch Generator
  • QA Mock Data & User Profile Generator
  • HTTP Status Code & Header Lookup
• 5. Networking & API Tools
  • cURL to Code Converter
  • CIDR / IPv4 Subnet Calculator
• 6. Time, Math & Text Processing
  • Unix Epoch & Timestamp Converter
  • String Case Converter & Text Inspector
  • Cron Expression Explainer

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1. Data & Formatting Utilities

JSON Formatter & Minifier

• Icon: {}
• Purpose: Format, minify, and validate JSON payloads.
• Features:
  • Customizable indentation (2-space or 4-space prettification).
  • One-click minification for compact payload transmission.
  • Detailed error reporting with character/line diagnostics for malformed inputs.
• Use Case: Cleaning up minified REST API responses and preparing payload bodies for QA tests.

JSON ↔ CSV Converter

• Icon: ⇄
• Purpose: Bidirectional translation between JSON arrays of objects and CSV spreadsheets.
• Features:
  • Automatically identifies header keys from JSON objects.
  • Escapes comma-containing values and quotation marks following RFC 4180.
  • Converts tabular CSV exports back into typed JSON arrays.
• Use Case: Exporting database test records to Excel/Sheets or seeding API tests from CSV test matrices.

XML Formatter & Validator

• Icon: <>
• Purpose: Beautifies and inspects raw XML documents.
• Features:
  • Recursively indents nested XML tags with 2 spaces.
  • Validates opening/closing tag balance and reports unmatched tags.
• Use Case: Inspecting legacy SOAP endpoints, SAML tokens, and Android XML manifests.

SQL Formatter & Query Beautifier

• Icon: 🗄️
• Purpose: Formats messy, single-line SQL queries into clean, readable code.
• Features:
  • Uppercases reserved SQL keywords (SELECT, FROM, JOIN, WHERE, GROUP BY, ORDER BY, INSERT, UPDATE, DELETE, etc.).
  • Automatically breaks clauses onto fresh lines with standardized indentation.
• Use Case: Debugging database queries generated by ORMs (Hibernate, Prisma, SQLAlchemy) during QA automation runs.

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2. Security, Tokens & Cryptography

Offline JWT Token Inspector

• Icon: 🔑
• Purpose: Decode and inspect JSON Web Tokens without disclosing secrets to remote websites.
• Features:
  • Parses header (alg, typ) and claims payload (sub, iss, aud, exp, iat, nbf).
  • Evaluates expiration timestamps and provides an active countdown timer.
  • Visual status alerts indicating whether a token is active, expired, or not yet valid.
• Use Case: Debugging OAuth2 and OpenID Connect flows in development environments.

Cryptographic Hashes & HMAC Generator

• Icon: #️⃣
• Purpose: Computes cryptographic checksums locally.
• Features:
  • Simultaneous calculation of MD5, SHA-1, SHA-256, and SHA-512.
  • Keyed-hash message authentication codes (HMAC-SHA256 & HMAC-SHA512) for signed webhooks.
• Use Case: Verifying file integrity and testing webhook signature verification algorithms.

Bcrypt & Password Generator

• Icon: 🔒
• Purpose: Generate cryptographically random secure passwords and test credentials.
• Features:
  • Custom length configuration (8 to 128 characters).
  • Toggles for uppercase, lowercase, numbers, and special symbols.
  • Excludes ambiguous characters (e.g. 1, l, I, 0, O) if desired.
• Use Case: Generating strong credentials for QA test accounts and database seeding.

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3. Encoders & Decoders

Base64 / URL / HTML Entity Codec

• Icon: 🔡
• Purpose: Encode and decode standard web data representations.
• Features:
  • UTF-8 safe Base64 encoder and decoder (handles non-ASCII characters without corruption).
  • URL query parameter encoding (encodeURIComponent) and decoding.
  • HTML entity escaping and unescaping (&, <, >, ", ').
• Use Case: Decoding basic auth headers, preparing query parameters, and testing XSS sanitizers.

Hex ↔ UTF-8 Text Converter

• Icon: 0x
• Purpose: Bidirectional translation between raw UTF-8 strings and hexadecimal bytes.
• Features:
  • Space-delimited and continuous hexadecimal format support.
  • ASCII and multi-byte UTF-8 character support.
• Use Case: Analyzing binary packet streams, memory dumps, and protocol payloads.

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4. Testing & QA Utilities

Regex Tester & Pattern Debugger

• Icon: .*
• Purpose: Test regular expressions against text and log files.
• Features:
  • Configurable regex flags (i, m, s, u).
  • Total match counter, character indexes, and group captures breakdown.
  • Real-time syntax error validation.
• Use Case: Verifying validation patterns for form inputs and parsing server log files.

Text Diff & Payload Comparator

• Icon: ±
• Purpose: Compare two text documents or JSON responses.
• Features:
  • Unified line-by-line comparison with green + additions and red - deletions.
  • Helps QA identify subtle discrepancies between expected and actual API responses.
• Use Case: Regression testing API contracts and comparing configuration revisions.

UUID & GUID Batch Generator

• Icon: 🎲
• Purpose: Bulk generation of unique identifiers.
• Features:
  • Supports UUID v4 (random) and time-based identifiers.
  • Options for uppercase output and hyphen removal.
  • Batch generation from 1 to 500 items at once.
• Use Case: Creating unique mock entity IDs for load testing and QA database inserts.

QA Mock Data & User Profile Generator

• Icon: 👥
• Purpose: Generates realistic dummy user records.
• Features:
  • Returns complete JSON objects with id, name, email, role, department, and status.
  • Batch size customizable up to 500 records.
• Use Case: Populating databases, mocking backend responses, and stress testing UI tables.

HTTP Status Code & Header Lookup

• Icon: 📡
• Purpose: Quick reference for HTTP response codes (1xx, 2xx, 3xx, 4xx, 5xx) and standard headers.
• Features:
  • Searchable by code (e.g. 401, 429, 503) or name.
  • Explains caching behavior, retry semantics, and typical causes.
• Use Case: Assisting QA engineers in writing API contract assertions.

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5. Networking & API Tools

cURL to Code Converter

• Icon: 🌐
• Purpose: Convert cURL terminal commands into copy-pasteable code.
• Features:
  • Extracts HTTP method, URL, headers (-H), and request body (-d / --data-raw).
  • Generates ready-to-run JavaScript (fetch) and Python (requests) scripts.
• Use Case: Converting requests copied from Chrome DevTools into automated test scripts.

CIDR / IPv4 Subnet Calculator

• Icon: 🌐
• Purpose: Calculate network bounds for IPv4 CIDR blocks.
• Features:
  • Computes Subnet Mask, Network Address, Broadcast Address, First Usable Host, Last Usable Host, and Total Usable Hosts.
• Use Case: Verifying firewall whitelist ranges and Kubernetes/Docker subnet configurations.

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6. Time, Math & Text Processing

Unix Epoch & Timestamp Converter

• Icon: ⏱️
• Purpose: Convert between Unix epoch numbers and human dates.
• Features:
  • Automatically handles both seconds (10 digits) and milliseconds (13 digits).
  • Outputs ISO 8601 UTC, RFC 2822, and Local Date/Time representations.
  • One-click “Current Timestamp” button.
• Use Case: Debugging database timestamps, token expiration windows, and log analysis.

String Case Converter & Text Inspector

• Icon: Aa
• Purpose: Multi-case transformation and string metrics.
• Features:
  • Converts text to camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and Title Case.
  • Analyzes word count, character count (with/without spaces), line count, and UTF-8 byte size.
• Use Case: Refactoring code symbols, naming test cases, and checking field length restrictions.

Cron Expression Explainer

• Icon: ⏲️
• Purpose: Translates 5-part cron syntax into human-readable schedules.
• Features:
  • Explains minute, hour, day-of-month, month, and day-of-week intervals.
• Use Case: Verifying scheduled batch jobs, recurring cron triggers, and QA test schedules.

Markdown to HTML Previewer

• Icon: 📝
• Purpose: Offline renderer translating GitHub Flavored Markdown into HTML with live visual preview.
• Features:
  • Renders headings, bold/italic, inline code, lists, blockquotes, and links.
  • One-click copy for clean rendered HTML markup.
• Use Case: Drafting release notes, READMEs, bug ticket descriptions, and documentation offline.

Color Palette & Format Converter

• Icon: 🎨
• Purpose: Bidirectional color conversion and visual preview.
• Features:
  • Converts between HEX (#38bdf8), RGB, RGBA, and HSL.
  • Visual color swatch and interactive native color picker.
• Use Case: QA theme verification, UI debugging, and CSS color extraction.

Lorem Ipsum Text Generator

• Icon: 📄
• Purpose: Generates realistic dummy placeholder paragraphs.
• Features:
  • Customizable paragraph count (1 to 20 paragraphs).
• Use Case: Stress testing UI text overflows, layout shifts, and pagination.

URL & Query String Parser

• Icon: 🔗
• Purpose: Decomposes URLs into component parts and extracts query parameters.
• Features:
  • Separates protocol, host, port, path, and hash fragments.
  • Converts URL query string parameters into a formatted JSON object.
• Use Case: Debugging complex redirect loops, OAuth callback parameters, and deep links.

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