JSON Formatter & Validator
Format, validate and minify JSON. Clear error messages with line positions. Runs fully in your browser — safe for sensitive data.
Runs in your browser
Nothing uploaded
Free, no signup
Ctrl + Enter to run · Recent brings back your last inputs · Everything stays in this browser
Related tools
All 112 free tools
Image Resize CalculatorCalculate new dimensions while preserving aspect ratio
Password Strength CheckerAnalyze password entropy and weaknesses
YAML ↔ JSON ConverterConvert between YAML and JSON
JSON to YAMLConvert JSON to YAML format
JSON Schema GeneratorInfer and validate API contracts
API Response DiffFind breaking response changes
Made something with AI? Share it as a private link.
Drop in the HTML from Claude, ChatGPT or any editor and get a link your client can open anywhere — with a password, view tracking, comments and approval.