Developer Tools
Format, encode, test, convert, inspect, and minify common developer data.
Format, validate, and compact JSON for quick review and cleanup.
DeveloperBase64 Encoder/DecoderEncode text to Base64 or decode Base64 back to readable text.
DeveloperRegex TesterTest regular expressions against sample text.
DeveloperTimestamp ConverterConvert Unix timestamps to readable dates and dates back to timestamps.
DeveloperColor PickerPick colors and convert between common color formats.
DeveloperCSS MinifierMinify CSS snippets for quick copy and paste use.
DeveloperQR Code GeneratorCreate a customizable QR code from text, links, contact details, or any short content.
DeveloperQR Code ReaderUpload a QR code image and extract the encoded text or link.
DeveloperHTML/CSS/JS Online EditorEdit HTML, CSS, and JavaScript with an instant sandboxed preview.
DeveloperJavaScript PlaygroundRun JavaScript snippets in a sandbox and capture console output.
DeveloperSQL RunnerRun SQL against a temporary SQLite database and view every result set.
About developer tools
Format, encode, test, convert, inspect, and minify common developer data. Use free online developer tools like JSON Formatter, Base64 Encoder/Decoder, Regex Tester, Timestamp Converter and more with practical examples, tips, FAQs, and mobile-friendly workflows.
This category groups related tools together so visitors can move from one task to the next without searching through the full library.
Most common workflows
What visitors usually do here
- Format JSON, encode Base64, test regex patterns, and convert timestamps during debugging.
- Generate QR codes for links, menus, contact details, posters, and quick sharing.
- Minify CSS snippets or preview small HTML/CSS/JS demos while working.
- Use SQL examples for quick SQLite-style query checks and learning tasks.
Which tool should I use?
- Use JSON Formatter when copied data is hard to read or validate.
- Use Base64 Encoder/Decoder when inspecting encoded strings from APIs or configs.
- Use QR Code Generator when a link needs to move from print to phone quickly.
- Use Regex Tester when a pattern needs to be checked against real sample text.
Developer questions
What can I do with developer tools?
Format, encode, test, convert, inspect, and minify common developer data. This hub includes tools such as JSON Formatter, Base64 Encoder/Decoder, Regex Tester, Timestamp Converter, Color Picker.
Are these developer tools free?
Yes. The ready tools in this category are free to use online on JustBloc.
Which tool should I open first?
Start with the tool that matches the immediate task, then use the related tools and guides on the page if your workflow needs another step.