Coding Tools
Developer utilities for in-browser REST API & webhook testing with cURL import, JSON formatting, live code playground, regex debugging, JSON data conversion, SQL formatting, code minification, robots.txt generation, and telemetry plotting.
Online REST API & Webhook Request Tester
Test REST APIs, webhooks, and HTTP endpoints online. Features cURL import/export, custom headers, query params, Bearer/Basic auth, JSON formatter, and latency metrics.
Robots.txt Generator & Validator
Generate, customize, and validate RFC 9309-compliant robots.txt files. Manage search bots, block AI scrapers, configure sitemaps, and test URL access in real-time.
JSON Formatter & Validator
Format, validate, beautify, and minify JSON data instantly with real-time error detection.
HTML, CSS & JS Live Playground
Live interactive web code editor & sandboxed preview playground with real-time console log interceptor.
Regex Tester & Code Generator
Test regular expressions with live match highlighting, interactive cheatsheet, and code generators.
JSON Converter & Code Generator
Convert data between JSON, YAML, and CSV formats bidirectionally, plus generate TypeScript, Go, Python, and Rust type definitions instantly.
Website Tech Stack Finder
Detect 120+ CMS platforms, frontend frameworks, backend servers, hosting providers, JS libraries, CSS styles, and analytics trackers with version details.
SQL Formatter & Validator
Format, beautify, validate, and minify SQL queries for various databases client-side instantly.
HTML / CSS / JS Minifier
Compress your HTML, CSS, or JavaScript code online. Remove comments, collapse spaces, and inspect compression metrics.
Web Serial Monitor & Plotter
Connect directly to your Arduino, ESP32, or other microcontrollers over USB. Inspect raw serial terminal output and plot numerical data on a real-time rolling canvas chart.
About Coding Tools
Streamline your software engineering workflow with essential web and coding utilities. Test REST APIs, webhooks, and HTTP endpoints directly in your browser with cURL command import/export, custom headers, and auth tokens, generate and validate RFC 9309-compliant robots.txt files with visual rules and AI crawler blockers, format, validate, and minify JSON payloads, write code in a real-time HTML/CSS/JS web playground, test and debug regular expressions with live match highlighting, convert JSON to CSV/XML/YAML datasets, format complex SQL queries across major database dialects, inspect website CMS and framework tech stacks, minify frontend code, or stream and plot real-time Web Serial and Web Bluetooth hardware telemetry.
Why Use Our Coding Tools?
- In-browser REST API & Webhook client with cURL import/export, auth tokens, custom headers, and latency metrics
- RFC 9309 Robots.txt generator and interactive URL rule testing sandbox with AI scraper blocking presets
- Website Tech Stack Finder detecting 120+ CMS, frameworks, servers, and hosting providers with version details
- JSON syntax highlighting, error linting, tree-view formatting, and minification
- Live HTML/CSS/JS playground with instant rendered output preview
- Multi-dialect SQL formatting (PostgreSQL, MySQL, SQLite, T-SQL, BigQuery)
- Bidirectional dataset conversion between JSON, CSV, XML, and YAML
- Web Serial API & Web Bluetooth hardware telemetry plotting with real-time graphs
How to Get the Most Out of Our Coding Tools
Select Your Tool
Browse the tools listed in this directory above to find the exact utility tailored to your file format, calculation, design task, or workflow requirement.
Configure & Process
Input your data, toggle custom parameters, and preview immediate live updates. Computations and transformations process locally on your device with high performance.
Export & Integrate
Copy formatted results, download structured CSV, SVG, PDF, or image files, and integrate outputs directly into your projects without watermarks.
Privacy & Data Security Notice: Tools across DwellixTools operate under a local-first privacy standard. Calculations, image rendering, and document operations process locally in your browser using modern Web APIs. No personal documents, private financial data, passwords, or image assets are stored on our servers.
Frequently Asked Questions About Coding Tools
Which syntax specifications do the code formatters support?
Our suite includes strict RFC 8259 JSON formatters and validators, SQL formatters supporting standard ANSI SQL, PostgreSQL, MySQL, and SQLite dialects, HTML/CSS/JS minifiers, and real-time Regex testers supporting JavaScript RegExp syntax.
What is the difference between JSON and JavaScript object literal notation?
Standard JSON requires double quotes around all keys and strings, strictly forbids trailing commas, and disallows comments and undefined values. Our JSON Validator identifies exact line and character positions of syntax violations.
How does the HTML/CSS/JS Playground isolate and sandbox running web code?
The live preview runs inside a restricted HTML5 iframe sandbox with isolated execution context. It captures virtual console logs without exposing your host browser to Cross-Site Scripting (XSS).
Are my private API keys, proprietary code snippets, or database queries logged?
No. All formatting, linting, syntax tree generation, and code minification run locally in your browser via client-side Web Workers. Your code never touches an external server.
Can the Web Serial Plotter connect to Arduino, ESP32, and Raspberry Pi Pico boards?
Yes! Using the modern Web Serial API supported in Chrome and Edge, you can connect directly to microcontrollers over USB at baud rates up to 115200 to plot live telemetry graphs.