Developer Tool
JSON Formatter & Validator
Prettify, minify, and inspect JSON payloads with line-by-line syntax validation directly in your browser.
JSON Editor31 lines · 527 chars · 527 bytes
Common JSON Errors
Trailing Commas
Standard JSON prohibits trailing commas after the last key-value pair or array element.
Double Quotes Required
All property keys and string values must be enclosed in double quotes ("), never single quotes (').
Supported Primitives
Strings, numbers, objects, arrays, booleans (true/false), and null are allowed. undefined and functions are invalid.
Strict Confidentiality
Zero payload leakage. Your API responses, secrets, and JSON payloads are formatted purely within local V8 JavaScript memory.