JSON Reader
Drop in minified or messy JSON and read it as clean, indented text.
Example
Input
{"a":1,"b":{"c":[true,null,3]}}Output
{
"a": 1,
"b": {
"c": [
true,
null,
3
]
}
}How it works
The reader parses your JSON and re-serialises it with two-space indentation, turning a single dense line into a structured, scannable document.
Good to know
JSON Reader takes a wall of compressed JSON — the kind an API returns on a single line, or text you copied straight out of a log or network tab — and re-indents it into a structured, line-by-line layout you can actually read. It's aimed at developers, QA testers, support engineers, and anyone who has to eyeball a payload and quickly understand what's inside it without firing up an editor or IDE.
Reach for it whenever you need to scan rather than edit: confirming the shape of an API response, finding which key holds a value, comparing two payloads by eye, or pasting a webhook body into a ticket so a teammate can follow the nesting. Because it runs entirely in your browser and preserves the original key order, the output mirrors your source exactly, which makes it safe for sensitive data and reliable when structure (not alphabetical sorting) is what you care about.
To read the result, follow the indentation: each two-space step inward marks one level deeper, curly braces wrap objects, square brackets wrap arrays, and the value after each colon shows its type at a glance — quoted strings, bare numbers, true/false, or null. If nothing formats, that usually means the input isn't valid JSON; a common culprit is a trailing comma, single quotes instead of double quotes, or an unquoted key.
A practical tip: this tool intentionally only pretty-prints — it does not sort, validate-with-detail, collapse nodes, or let you edit in place. If you need those, the sibling tools (JSON Parser, JSON Viewer, JSON Tree, JSON Minify) cover them, and you can run output back through JSON Minify to compress it again once you're done reading.
Frequently asked questions
Can it read minified JSON?
Yes — that's exactly what it's for. Paste a one-line minified blob and get readable, indented output.
Does it sort keys?
No, key order is preserved as written so the output matches your source structure.
Is my JSON uploaded anywhere?
No — everything runs in your browser with JavaScript. Your data never leaves your device, so it's safe for sensitive payloads and works offline once loaded.
Is this tool free?
Yes, completely free with no sign-up and no limits.
More JSON tools
People also ask
What does it mean to pretty-print JSON?
Pretty-printing reformats JSON by adding line breaks and consistent indentation so its nested structure is visible, without changing any of the actual data. This JSON Reader uses two-space indentation.
Why is my JSON all on one line?
APIs and storage systems usually minify JSON by stripping whitespace to save bandwidth and space, which produces a single dense line. Running it through a reader restores the indentation for human viewing.
What's the difference between a JSON reader and a JSON parser?
A reader focuses on reformatting valid JSON into readable, indented text, while a parser converts JSON into a usable data structure and typically flags exactly where and why invalid JSON fails.
Does formatting JSON change its data or meaning?
No. Indentation and line breaks are insignificant whitespace in JSON, so a formatted version is functionally identical to the minified one — only its readability changes.
Why won't my JSON format?
The input is likely not valid JSON. Common causes include trailing commas, single quotes instead of double quotes, unquoted keys, or comments, none of which the JSON standard allows.
Is JSON the same as a JavaScript object?
They look similar but differ. JSON requires double-quoted keys and strings, allows only a fixed set of value types, and disallows comments and trailing commas, whereas JavaScript object literals are more permissive.
Can I format very large JSON files in the browser?
Browser-based formatters can handle sizable inputs, but extremely large payloads may be slow or memory-heavy since processing happens locally on your device rather than on a server.
How do I read nested JSON quickly?
Track the indentation depth: each inward step is one nesting level, braces denote objects and brackets denote arrays. Following the indentation lets you trace the path from the top level down to any value.