JSON Pretty Print: Beautify JSON Online, Free
Minified JSON saves bytes but it's miserable to read — one long line, no line breaks, every brace crammed together. Pretty-printing fixes that: clean indentation, one field per line, structure you can actually follow. Paste your JSON below and beautify it in your browser, then explore it as a table or tree.
A free online tool · Updated 29 May 2026
What "pretty print" actually means
JSON doesn't care about whitespace. These two documents are identical to a parser:
{"id":1,"name":"Alice","roles":["admin","editor"],"active":true}…and the same thing, pretty-printed:
{
"id": 1,
"name": "Alice",
"roles": [
"admin",
"editor"
],
"active": true
}Both are valid. But the second one is for humans — each key sits on its own line, nested arrays and objects are indented, and you can see the shape of the data at a glance. That's all pretty-printing is: re-serializing JSON with consistent indentation and line breaks so it's readable. It doesn't change a single value, just the spacing between them.
How to pretty print JSON in 3 steps
1 Paste or upload your JSON
Open prettyjsonxml.com and drop your JSON into the editor — press Ctrl+V (or Cmd+V on Mac), or click Upload a file to load a .json file straight from disk. It can be minified, messy, or hand-typed; the formatter doesn't mind.
2 Click "Format"
Hit the Format button. The viewer parses your JSON and re-prints it with two-space indentation, one field per line, and arrays expanded vertically. If the JSON is invalid, you'll get a clear error pointing at where parsing broke — usually a trailing comma or a missing quote.
3 Copy it back, or keep exploring
Select-all and copy to grab the beautified result. Or skip the copy entirely and switch to Table or Tree view to read the data instead of the text — more on that next.
Beyond formatting: table and tree views
Here's the thing about pretty-printing: it makes JSON readable, but it doesn't make it scannable. A neatly indented 800-line API response is still 800 lines you have to scroll. That's where this tool goes further than a plain beautifier.
Tree view
Tree view renders your JSON as a foldable outline — collapse the branches you don't care about, expand the one you do. It's the fastest way to navigate a deeply nested config or a sprawling response without losing your place.
Table view
When your JSON is an array of similar objects (the shape most API responses take), Table view turns each object into a row and its shared fields into sortable columns. Click a header to sort, type in the search box to filter, click a row to expand its full detail. You stop reading JSON and start scanning data. There's a full walkthrough in the guide on viewing large JSON files.
Pretty print vs. minify
Pretty-printing and minifying are opposites, and you'll want both at different times:
- Pretty print when you're reading, debugging, or reviewing JSON by hand — you want every line break and indent.
- Minify when you're shipping JSON over the wire, embedding it in a config, or pasting it somewhere size-sensitive — you want every byte gone.
The viewer does both. Format expands; Minify collapses everything back to a single compact line. Round-trip as many times as you like — the data is identical either way.
Big files and broken JSON
Most online beautifiers choke on anything large or invalid. This one is built for the messy real world:
- Large files. JSON parsing runs off the main thread for bigger documents, and the editor switches to a placeholder above ~5 MB so a 9 MB blob doesn't freeze your tab. The data still loads and formats — see the large JSON file guide for the details.
- Invalid JSON. If your input won't parse, you get a specific error instead of silent failure, so you can find the stray comma fast.
Does my JSON get uploaded?
No. The viewer is a single HTML file with no backend and no upload endpoint. Your JSON is parsed, formatted, and rendered entirely by your browser's JavaScript engine — nothing is sent anywhere. If you're curious about the why and the how, there's a dedicated note on viewing JSON without uploading it.