What Are Online Developer Tools?
Online developer tools are browser-based utilities that help software engineers format, validate, convert, and generate code and data — without installing IDE plugins or running local scripts. They're indispensable for quick debugging (format that minified JSON response), validation (check that YAML config before deploying), and generation (create a UUID for a database record).
How to Use These Tools
All tools work entirely in your browser — nothing is sent to a server. Paste your code or data, and results appear instantly. The JSON Formatter validates and prettifies JSON in one step. The XML Formatter handles complex nested XML with configurable indentation. The CSS Box Shadow Generator lets you build shadows visually with sliders and copy the CSS instantly.
Available Tool Categories
- Formatters: JSON, XML, HTML, YAML, CSS, SQL — format, validate, and minify code
- Generators: UUID, Password, Hash (MD5/SHA-1/SHA-256), QR Code
- CSS Builders: Box Shadow Generator, Border Radius Generator, Gradient Generator (in Color section)
- Converters: Unix Timestamp, Image to Base64, Ruby to JSON, JWT Decoder
- Calculators: Aspect Ratio Calculator
Frequently Asked Questions
How do I format JSON online?
Use our JSON Formatter. Paste raw JSON, and it formats with proper indentation, validates structure, and highlights errors. Minify option removes all whitespace for smaller payloads. Works with arrays, nested objects, and Unicode.
What is the difference between XML and JSON?
XML uses tags (<name>value</name>) and supports attributes — verbose but expressive for documents. JSON uses key-value pairs ({"name": "value"}) — compact and standard for REST APIs. Use our XML Formatter and JSON Formatter for both formats.
What is a UUID and when should I use one?
A UUID (Universally Unique Identifier) is a 128-bit ID like 550e8400-e29b-41d4-a716-446655440000. Version 4 UUIDs are randomly generated. Use them as database primary keys when you need globally unique IDs across distributed systems. Our UUID Generator creates multiple UUIDs at once.
What is the difference between CSS box-shadow inset and outset?
Default box-shadow renders outside the element (outset). The inset keyword renders inside the border, creating a pressed/recessed effect. Our CSS Box Shadow Generator lets you toggle inset with a live preview.
How do I validate YAML online?
Use our YAML Formatter. Paste YAML content and it validates in real-time, showing specific errors (indentation issues, missing colons). Also converts YAML to JSON to verify the parsed structure matches expectations.