JSON Formatter — Free Online Formatter
Format, validate, and minify JSON data
All processing happens locally. No data is sent to any server.
JSON (JavaScript Object Notation) is a lightweight data interchange format that's easy for humans to read and write, and easy for machines to parse and generate. Our JSON Formatter helps you beautify, validate, and minify JSON data with just a few clicks. Simply paste your JSON into the input area, and click "Format" to get properly indented, readable JSON. You can choose between 2, 4, or 8 space indentation. If you need to compress your JSON for transmission, click "Minify" to remove all whitespace. The formatter also validates your JSON in real-time, highlighting syntax errors with line and column information so you can fix issues quickly. This tool is essential for developers working with APIs, configuration files, or data storage. Whether you're debugging API responses, formatting configuration files, preparing data for storage, or reviewing JSON data from a database export, this tool handles it all. The real-time validation catches common mistakes like missing commas, trailing commas, and mismatched brackets before they cause problems in your code. All processing happens entirely in your browser — your data never leaves your device. This makes it safe to use with sensitive data, API keys, or confidential information. Need to convert your JSON to another format? Try our [JSON ↔ YAML Converter](/tools/json-yaml) to switch between formats. If you're working with encoded tokens, our [JWT Decoder](/tools/jwt-decoder) can help you inspect their contents.
FAQ
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data format used for storing and exchanging data. It's widely used in APIs, configuration files, and data storage.
How to validate JSON online?
Paste your JSON into the input field and click "Format". If there are any syntax errors, our validator will show you the exact line and column where the error occurred.
Is my data safe?
Yes. All processing happens entirely in your browser. Your data is never sent to any server or stored anywhere. Your data never leaves your browser.
Does it work offline?
Yes! Once the page is loaded, all formatting and validation happens client-side. You can use it offline after the initial page load.
What indent formats are supported?
We support 2-space, 4-space, and 8-space indentation. You can also minify JSON to remove all whitespace.