JSON Formatter & Validator
Format, validate, and beautify JSON data online. Detect syntax errors instantly. Free developer tool.
How to Use JSON Formatter & Validator
Paste your JSON
Paste raw or minified JSON into the editor. Or upload a .json file directly.
Validate and format
JSON is validated instantly. Errors are highlighted with their exact line and character position.
Choose output style
Select 2-space, 4-space, or tab indentation. Or switch to minified output for production.
Copy or download
Copy formatted JSON to clipboard or download as a .json file.
About JSON Formatter & Validator
JSON (JavaScript Object Notation) is the universal data format for APIs, configuration files, and data storage. Malformed or unformatted JSON is one of the most common sources of bugs in web development. Our JSON Formatter and Validator helps you instantly detect, format, and debug JSON data.
Whether you're debugging an API response, formatting a config file, or validating data structure before processing — this tool handles it in seconds.
What the formatter does - Pretty-prints minified JSON with proper indentation (2 or 4 spaces, or tabs) - Minifies formatted JSON to a single line for production use - Validates JSON syntax and highlights exact error locations - Tree view for exploring nested JSON structures - Supports JSON5 (comments, trailing commas) with conversion to standard JSON
Common JSON errors this tool catches - Missing or extra commas - Unclosed brackets or braces - String values without quotes - Single quotes instead of double quotes - Trailing commas (invalid in JSON) - Unescaped special characters in strings
Key Features
Syntax Validation
Instant validation with precise error location highlighting.
Pretty Print
Format with 2-space, 4-space, or tab indentation.
Minification
Compress JSON to a single line for production use.
Tree View
Explore nested JSON in an expandable tree interface.
Benefits
- Catch JSON syntax errors before they cause production bugs
- Make complex nested JSON readable for code reviews
- Quickly validate API responses during development
- Minify JSON configs for production performance
Who Uses This Tool
- Developers debugging API responses
- DevOps engineers formatting config files
- Backend developers validating data payloads
- Frontend developers inspecting JSON state objects
Pro Tips for Best Results
- 1Use 2-space indentation for most configs — it's the most widely adopted standard
- 2Always validate JSON before committing to version control
- 3Use minification for production JSON files to save bytes
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