The developer toolkit is constantly evolving. In 2025, speed and privacy are the defining characteristics of the best tools. Here are 5 tools that every full-stack developer should have bookmarked.
1. Data Transformation: json2toon.co
Known as the "Swiss Army Knife" for data formats. Whether you're debugging an API that returns massive JSON lines or need to convert a config file from YAML to XML, json2toon.co handles it all. It runs entirely in the browser (huge privacy plus) and supports the new efficient TOON format for AI workflows.
2. API Testing: HTTPie
While Postman is great, the HTTPie desktop app offers a faster, cleaner specifically designed for modern workflows. Its meaningful color-coding and simple interface make testing endpoints a breeze.
3. Terminal: Warp
The terminal for the 21st century. Warp adds AI command search, collaborative workflows, and a modern text-editor feel to the command line. It makes the terminal feel less like a relic and more like a productivity tool.
4. Diagramming: Eraser.io
Documentation is code. Eraser allows you to create beautiful architecture diagrams using code-like syntax. It integrates perfectly into PRs and documentation workflows.
5. Playground: CodeSandbox
For quick prototyping without the overhead of local setup, CodeSandbox's instant cloud development environments are unmatched. Spin up a full Next.js or Node container in seconds.
Which of these is your favorite? Let me know in the comments!