JSON Formatter
Paste any JSON below. format it, validate syntax errors, or minify for production. Everything runs in your browser.
JSON Pretty Print Online
Built for the moment a log line, CI artifact, or vendor dump arrives as one unreadable strip. Paste it here, expand it with consistent indentation, and sanity-check structure in the same pass. If you are massaging API payloads for size, use the minifier page instead; this page is about reading and hand-editing, not shaving bytes.
Example
{"name":"Alice","age":30,"address":{"city":"London","zip":"SW1A"}}{
"name": "Alice",
"age": 30,
"address": {
"city": "London",
"zip": "SW1A"
}
}How to Use
- Paste your minified or compact JSON into the input panel above
- Select your preferred indentation (2 spaces, 4 spaces, or tab)
- Click Format or press Ctrl+Enter
- Copy the formatted output or download as .json
Features
- Instant pretty-printing with 2-space, 4-space, or tab indentation
- Validates JSON while formatting. errors shown with exact line and column
- Minify button to compact JSON back to a single line
- Syntax highlighting in the output panel
- One-click copy and .json download
- 100% private; runs entirely in your browser
Frequently Asked Questions
What does pretty print mean for JSON?
Pretty printing adds consistent indentation, line breaks, and spacing so nested structures are easy to read visually. the opposite of minified JSON which strips all whitespace.
What indentation does this tool use?
The default is 2-space indentation, the most common standard for JSON. You can switch to 4 spaces or tab in the toolbar before formatting.
Does pretty printing change the JSON data?
No. Only whitespace changes. The data, keys, values, and structure remain identical. Minified and pretty-printed JSON parse to exactly the same JavaScript object.
Related Tools