1. JSON → Java Class Generator
Paste a raw JSON object here. It auto-beautifies on paste. Example: {"wardId":1,"wardName":"Cardiology"}.
2. JWT Decoder
Header
Payload
3. Base64 Encoder/Decoder
4. SQL Formatter
5. Liquibase Changelog Generator
6. JPA Entity Generator
7. Regex Tester
Flag help: i m s x u U d Example: use im for case-insensitive + multiline.
Run a test to see highlighted matches and detailed match positions.
Highlighted Text
Matched text is highlighted in yellow.
Match Details
Shows each match value, index range [start, end), and capture groups.
8. Cron Expression Builder
9. UUID Generator
Free Online Developer Tools Hub
FreeJavaDevTools.com (DevToolkit) provides fast online developer tools for common tasks: JSON to Java conversion, JWT decoding, SQL formatting, regex testing, Base64 encode/decode, cron expression generation, UUID creation, Liquibase changelog generation, and JPA entity generation.
Use these utilities for day-to-day backend and frontend workflows, debugging payloads, and code generation without installing extra desktop tools. These tools target high-intent developer searches like json to java class generator, online jwt decoder, sql beautifier, regex tester with flags, cron expression generator, and uuid generator online.
Frequently Asked Questions
How do I use the JSON to Java converter?
Paste a JSON object in the JSON input, optionally provide a class name, and click Generate Java Class.
Does the regex tester support flags?
Yes. Use flags like i, m, and s in the Flags field. The tool shows highlighted matches and detailed groups.
Are these developer tools free?
Yes. DevToolkit is free to use for common development workflows.