JSON Formatter
Make your JSON clean, readable, and easy to debug.
11 tools · Always free
Developer Tools
Use free browser-based tools for JSON, Base64, JWT, UUIDs, regex, URL encoding, HTML, CSS, color conversion, and cron expressions.
JSON Validator
Check JSON syntax and find errors quickly.
Base64 Encoder / Decoder
Encode text and files, or decode UTF-8 Base64.
JWT Decoder
Inspect token headers and payloads privately.
UUID Generator
Create secure random v4 identifiers in a click.
Regex Tester
Test patterns, explore groups, and try replacements.
URL Encoder / Decoder
Encode URLs and inspect query parameters.
HTML Formatter
Bring readable structure to your HTML markup.
CSS Minifier
Remove unnecessary CSS whitespace safely.
Color Converter
Move between HEX, RGB, and HSL colors.
Cron Expression Generator
Build a schedule and see upcoming run times.
Practical guides (English)
- How to debug a JSON API response without losing important data — A worked JSON debugging workflow: isolate syntax errors, preserve large IDs, check data types, and distinguish formatting from schema validation.
Fast browser tools for common development tasks
Format or validate JSON, inspect a JWT payload, encode Base64 and URLs, test regular expressions, generate UUIDs, tidy HTML, minify CSS, convert colors, and build cron expressions. Inputs are processed in your browser, which makes the collection useful for quick checks during development and debugging.
Use JSON Formatter to make nested data readable, JSON Validator to locate syntax errors, JWT Decoder to inspect token claims without verifying a signature, and Regex Tester to review matches and replacements before using a pattern in code.
Popular tools
- JSON Formatter — Make your JSON clean, readable, and easy to debug.
- JSON Validator — Check JSON syntax and find errors quickly.
- Base64 Encoder / Decoder — Encode text and files, or decode UTF-8 Base64.
- JWT Decoder — Inspect token headers and payloads privately.