JSON Formatter & Validator
Format, minify, validate, and explore JSON data. All processing happens in your browser.
How to Use the JSON Formatter
Paste your JSON data into the input panel on the left, and the formatted output appears instantly on the right. You can also load JSON directly from a URL using the input field above the editor.
Format & Beautify
Converts compact JSON into readable, indented format with 2-space indentation. Press Ctrl+Enter for quick formatting.
Minify
Removes all whitespace to produce the smallest possible JSON string. Useful for reducing payload size in APIs and config files.
Validate
Checks if your JSON is syntactically valid. Shows precise error location with line and column numbers when errors are found.
Tree View
Visualize JSON structure as an interactive, collapsible tree. Click nodes to expand or collapse nested objects and arrays.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is based on a subset of JavaScript and is language-independent.
JSON supports six data types: strings, numbers, booleans, null, arrays, and objects. It is the most common format for REST APIs, configuration files, and data storage in web applications.
Frequently Asked Questions
Is my JSON data sent to a server?
No. All formatting, validation, and type generation happens entirely in your browser. Your data never leaves your device.
What is the maximum JSON size supported?
There is no hard limit. The tool handles large JSON files efficiently using CodeMirror's virtual rendering. Performance depends on your browser and device.
How does the TypeScript type generation work?
The tool analyzes your JSON structure and infers TypeScript interfaces. Objects become interfaces, arrays become typed arrays, and primitives map to their TypeScript equivalents (string, number, boolean, null).
Can I load JSON from a remote URL?
Yes. Enter a URL in the load field above the editor. The request is made directly from your browser, so the server must allow CORS requests.
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