JSON Formatter

Format and Pretty-Print JSON Instantly

The JSON Formatter takes messy, minified, or single-line JSON and turns it into clean, indented, human-readable output. Whether you are debugging an API response, inspecting a config file, or reviewing a webhook payload, well-formatted JSON makes the structure obvious at a glance. It applies consistent indentation, aligns nested objects and arrays, and gives you a live tree view so you can expand and collapse deeply nested data without losing your place.

How it works

Everything runs locally in your browser using JavaScript. Paste your JSON and it is parsed and re-serialized on your own device — nothing is ever uploaded to a server. If the input is invalid, the formatter flags the problem so you can fix it before continuing. Because the work is client-side, formatting is instant even for large files, and it keeps working offline once the page has loaded.

Common use cases

• Beautify API responses copied from your terminal or browser dev tools.
• Reformat compact JSON pulled from logs or a database.
• Review configuration files with clear indentation before committing.
• Explore nested payloads using the collapsible tree view.

Need to reverse the process? Use the JSON Minifier to strip whitespace back out. To confirm your data is well-formed first, try the JSON Validator, and when you are ready to move data elsewhere the JSON to CSV converter turns arrays of objects into spreadsheet-ready rows.

Private by design

Because formatting happens entirely in your browser, sensitive tokens, credentials, and customer data in your JSON never leave your machine. There is no account and no logging of your payloads, which makes it safe for work data you cannot paste into third-party services.