JSON Formatter & Beautifier — Pretty Print JSON Online [2026]
Free JSON formatter and beautifier. Paste JSON → get perfectly indented, syntax-highlighted output. Validate, minify, and format JSON with customizable indentation. 100% browser-based.
What is JSON Formatter?
How to Use JSON Formatter
1. Paste your JSON into the input area on the left. 2. Choose your indentation size (2 spaces, 4 spaces, or tab). 3. The formatted JSON appears instantly on the right with syntax highlighting. 4. Use the Minify button to compress JSON to a single line. 5. Click Copy to copy the result or Download to save it as a file.
How JSON Formatter Works
Common Use Cases
- Formatting API response payloads for readability
- Validating JSON configuration files for syntax errors
- Beautifying minified JSON from production logs
- Preparing JSON data for documentation or code reviews
- Minifying JSON for smaller payload sizes in production
Frequently Asked Questions
What is JSON formatting?▼
JSON formatting (also called pretty-printing or beautifying) adds whitespace, line breaks, and indentation to JSON data to make it human-readable. Minified JSON has no extra whitespace, while formatted JSON has consistent indentation.
Does this tool validate JSON?▼
Yes. The tool validates your JSON as it formats it. If the JSON has syntax errors, it will display a detailed error message showing what went wrong and where.
What is the difference between 2-space and 4-space indentation?▼
Both are valid formatting styles. 2-space indentation is more compact and popular in JavaScript/TypeScript projects. 4-space indentation is more readable and common in Python and Java ecosystems. Choose whichever your team or project prefers.
Is my data sent to a server?▼
No. All formatting and validation happens entirely in your browser using JavaScript. Your JSON data never leaves your machine.