Format JSON, inspect JWTs, test regex, and convert API examples in seconds — right in your browser. Everything you paste stays on your device: nothing is uploaded or stored on a server.
Live product preview
Core tools
Fast, no-signup utilities for the tasks developers repeat every day. Pick a tool and start working instantly.
Format, validate, and beautify JSON instantly with color-coded syntax.
{
"name": "DevBox",
"type": "Utility Tool",
"features": [
"JSON Formatter",
"Regex Tester",
"cURL Converter"
],
"license": "MIT"
}What users get
A focused formatter with validation, formatting, and copy-friendly output for everyday API work.
Convert structured JSON data into clean, readable YAML format instantly.
Open Tool →Why DevBox
Three things you can count on every time you open a tool.
Your input never leaves your device — no uploads, no accounts, no waiting on a server.
Each tool solves one common job — format, decode, test, convert — so you get in and out fast.
Step-by-step tutorials and examples walk you through each tool and its common edge cases.
Guides & tutorials
Step-by-step walkthroughs for formatting JSON, testing regex, and converting cURL requests — with copy-paste examples.
Learn how to format, validate, and share JSON without breaking structure or losing readability.
Understand flags, match groups, and debugging patterns with practical examples.
See how to convert request examples into code you can paste into your app immediately.
Paste messy JSON and watch it transform into clean, readable output. One-click copy for configs, CI, and quick fixes.
{
"name": "DevBox",
"config": {
"env": "prod",
"logging": true,
"features": [
"json",
"regex",
"curl",
"svg"
]
},
"owner": "team"
}Type a pattern and see matches highlight instantly. Build, test, and iterate faster with immediate feedback.
Paste a cURL and get ready-to-use Fetch or Axios code with a click — perfect for quickly using API examples.
FAQ
Quick answers on what the tools do, how your data is handled, and where to begin.
Yes. The core tools are free to use and run directly in the browser.
No. Everything you paste is processed locally in your browser and never uploaded to a server.
No. The guides are free and walk you through each tool with practical, copy-paste examples.
Start with JSON Formatter, Regex Tester, or cURL Converter if you want the highest-value utility pages.