Free JSON Formatter – Beautify & Validate JSON Online
Format, validate, and minify JSON instantly.
ToolCraftr is a free JSON formatter that beautifies, validates, and minifies JSON data directly in your browser. Our JSON beautifier features syntax highlighting, error detection, and one-click formatting. Perfect for developers working with APIs, config files, and data interchange.
Who is this JSON formatter for?
API Developers formatting and validating API responses and request payloads.
Frontend Engineers debugging JSON data from REST APIs and GraphQL queries.
DevOps Engineers editing configuration files and infrastructure-as-code manifests.
Data Analysts inspecting and transforming JSON data exports.
Key Features
Smart Formatting
Automatically indent and structure JSON with configurable spacing (2 or 4 spaces).
Syntax Validation
Real-time error detection with precise line and column numbers for debugging.
Syntax Highlighting
Color-coded JSON makes it easy to distinguish keys, values, strings, and numbers.
Minification
Remove all whitespace to reduce file size for production deployment.
Copy & Download
One-click copy to clipboard or download formatted JSON as a .json file.
100% Private
All processing happens in your browser. No JSON data is sent to servers.
Understanding JSON
JSON (JavaScript Object Notation) is a lightweight data interchange format. It's easy for humans to read and write, and easy for machines to parse and generate.
JSON is built on two structures: collections of key/value pairs (objects) and ordered lists of values (arrays). It's the standard format for REST APIs, configuration files, and data exchange.
Common Questions
What is JSON formatting?
JSON formatting (or beautifying) transforms compact JSON into human-readable format with proper indentation, line breaks, and spacing. This makes it easier to read, debug, and understand complex data structures.
Can it validate JSON syntax?
Yes! Our formatter automatically validates JSON syntax and highlights errors with clear messages indicating exactly where and what the problem is.
What is JSON minification?
Minification removes all unnecessary whitespace, line breaks, and indentation from JSON, reducing file size. This is useful for production environments where bandwidth and storage matter.
Is my JSON data stored?
No. All formatting, validation, and minification happen entirely in your browser using JavaScript. We do not store, log, or transmit any of your JSON data to our servers.
Ready to format JSON?
No sign-up, no installation. Start formatting and validating JSON now.