DEVHELP.CORE
A comprehensive, client-side engineering suite. Designed for speed, privacy, and technical precision. No backends, no tracking, just pure logic.
Privacy Manifesto
Local-First Execution
Data security is our primary architecture. Unlike online formatters that send your payloads to remote servers, DEVHELP processes every single bit of information within your browser's V8 engine.
- [✓] No database persistence
- [✓] No telemetry on input fields
- [✓] Isolated sandbox execution
- [✓] Zero data retention policy
Module Specs
JSON Engine
Native JavaScript JSON APISupports recursive parsing, 2-space indentation formatting, and aggressive minification. Real-time syntax validation with atomic error reporting.
XML Parser
DOMParser API + Recursive TraversalConverts hierarchical XML structures into JSON objects. Handles attributes, child nodes, and text content mapping via a custom tree-walker.
JWT Decoder
Base64Url + UTF-8 DecodingClient-side inspection of Header, Payload, and Signature. Uses decodeURIComponent to ensure character safety for non-ASCII claims.
Regex Tester
Stateful Iterative RegExp EvaluationVisual simulation of the regex engine. Maps 'scanning' and 'discarding' states character-by-character to visualize backtracking logic.
Epoch Time
JS Date Object + Unix HeuristicsBidirectional conversion. Automatically detects if input is in seconds or milliseconds. Synchronized with the real-time system clock.
Diff Checker
diff-match-patch (Google Algorithm)Semantic comparison between two text buffers. Features a visual diff-view mode and a 'swap' functionality for easy source-target comparison.
Base64 Tool
Window.btoa / Window.atobStandard-compliant Base64 encoding and decoding. Implements UTF-8 safety wrappers to prevent character corruption during processing.
HTML Studio
VFS + Iframe srcdoc IsolationVirtual File System (VFS) simulating a local server. Supports multi-page navigation via postMessage inter-process communication and multi-device viewport simulation.
Log Viewer
Pattern-based String AnalysisMulti-keyword AND-logic filtering. Implements dynamic highlighting with <mark> tags and automatic log-level detection (ERROR, WARN, INFO, DEBUG).
Under the hood
Built with a modern stack optimized for developer experience and lightning-fast responsiveness.