JSON Pretty Print Free Online Formatter
Overview
Pretty printing makes deeply nested JSON structures readable by adding consistent indentation. This formatter supports 2-space (JavaScript convention) and 4-space (Python convention) indent styles. Syntax highlighting colors strings, numbers, booleans, and null values for faster scanning.
How to Use This Tool
Paste your JSON, choose your indent size (2 or 4 spaces), and click Format. The output updates instantly with color-coded syntax highlighting. Use the copy button to grab the formatted result.
Ready to get started? It's free, no registration required, and your files never leave your device.
PDF Tool →Frequently Asked Questions
What indent size should I use for JSON?
2 spaces is standard in JavaScript and Node.js codebases. 4 spaces is common in Python (json.dumps default). Both are valid, the choice is stylistic, not structural.
Does pretty printing affect JSON parsing?
No. JSON parsers ignore whitespace between tokens. A pretty-printed JSON file and its minified equivalent produce identical data structures when parsed.
Can I use this to format API responses from Postman or curl?
Yes. Copy the raw response body from Postman, curl output, or browser DevTools and paste it here. The formatter handles responses of any size.