JSON Formatter, Validator & Editor

Format, validate, prettify, and minify your JSON data in real-time. 100% client-side processing.

Interactive JSON Editor & Formatter
Visual JSON Node Explorer (Tree View)
Valid formatted JSON will display as an interactive tree view here...
Complete Guide to JSON Formatting and Validation
JSON (JavaScript Object Notation) is the lightweight data-interchange format that dominates modern web APIs. However, raw JSON generated by servers, logging tools, or databases is often minified into a single line, making it hard for developers to read, trace, or modify. This online JSON Formatter makes minified structures easy to parse.
Why Validate JSON Client-Side?
Security and privacy are major concerns when pasting configuration structures, API responses, or payload details containing user IDs, keys, or business metrics into online utilities. Because this tool handles all calculations locally on your machine, your code is never transmitted or saved, keeping it 100% private.
Common JSON Formatting Mistakes
If the syntax checker fails, look out for these frequent validation gotchas:
  • Trailing Commas: Unlike JavaScript, JSON does not allow a comma after the final key-value pair in an object or array.
  • Single Quotes: All keys and string values must use double quotes ("). Single quotes (') are invalid.
  • Unescaped Control Characters: Newlines inside strings must be escaped as \n.
  • Incorrect Brackets: Ensure all opening brackets match their closing counterparts.
Need more utilities? Try our JSON to TypeScript Converter, YAML/JSON/XML Converter, and File Compare Tool.