JSON Beautifier
Beautified JSON will appear here...
🌳 JSON Tree View
Beautify JSON to see the tree view...
Quick answer
Beautifying (also called pretty-printing) adds line breaks and 2-space indentation to compact or minified JSON so it's readable, without changing the data. It runs in your browser as JSON.parse() then JSON.stringify(data, null, 2), so nothing is uploaded — and because it parses first, it also tells you if the JSON is invalid. Paste JSON, click Beautify, then copy or download.
What does beautifying JSON do?
Beautifying JSON transforms compact or minified JSON into a readable, indented format. Consider this minified JSON:
{"name":"John","age":30,"address":{"city":"London","zip":"EC1A"}}
After beautifying with 2-space indentation:
{
"name": "John",
"age": 30,
"address": {
"city": "London",
"zip": "EC1A"
}
}
The data is identical — only the whitespace changes: each key-value pair moved onto its own line, and the nested address object was indented one level deeper. Beautified JSON is easier to read, debug, and review in code diffs.
Beautify vs minify
Beautify — adds whitespace and indentation for human readability. Use this when reading API responses, reviewing config files, or debugging data structures.
Minify — removes all whitespace to reduce file size. Use this when sending JSON in production HTTP responses or storing data compactly. Try the JSON Minifier for the opposite operation.
When to Use the JSON Beautifier
- When an API returns a single-line response and you need to inspect specific fields without squinting.
- When reviewing a JSON config file (e.g.,
package.json,appsettings.json) that was accidentally saved without formatting. - When copying a minified JSON payload from browser DevTools and want to read it quickly.
- Before committing a JSON file to version control — beautified JSON produces clean, readable diffs in pull requests.
Edge cases & gotchas
- Duplicate keys collapse silently. JSON allows an object to list the same key twice, but parsing keeps only the last one, so
{"a":1,"a":2}beautifies to{"a": 2}— a duplicated key loses data with no error. Beautifying is a quick way to reveal that a payload had duplicate keys. - Numbers are normalized. Because the tool parses then re-serializes,
1.0becomes1and1E2becomes100. The value is unchanged; only the text form is. - Unicode escapes are decoded.
ébecomes the literal characteréin the output. Both are valid JSON and mean the same thing. - It validates syntax, not schema. Beautifying confirms the JSON parses, but says nothing about whether the fields match what your application expects — use the JSON Schema Validator for that.
- Invalid JSON won't beautify. A trailing comma, single quotes, or an unquoted key makes it fail with an error at the offending position, so you fix the source rather than getting mangled output.
Frequently Asked Questions
What does beautify JSON mean?
Beautifying JSON means adding indentation, line breaks, and proper whitespace to compact or minified JSON so it becomes readable. It is also called pretty-printing or formatting. The data itself does not change — only the presentation.
What is the difference between beautify and minify?
Beautify adds whitespace and indentation to make JSON human-readable. Minify does the opposite — it removes all whitespace to make JSON as compact as possible. You beautify for reading and debugging; you minify for shipping.
How many spaces does the beautifier add?
The beautifier uses 2-space indentation by default — the most common convention for JSON. This matches JSON.stringify(data, null, 2) in JavaScript.
Is my JSON sent to a server?
No. All JSON beautification happens entirely in your browser using JavaScript. Your data never leaves your device.
What is the difference between JSON Beautifier and JSON Formatter?
They share the core indentation step but are built for different jobs. This Beautifier is focused purely on producing clean, readable indented output — paste messy JSON, get pretty JSON, with the indentation conventions and gotchas explained. The JSON Formatter is a fuller workspace: it validates and reports the exact error position, offers a Repair step for near-JSON (single quotes, trailing commas), renders an interactive tree view, minifies, and generates a shareable link. Use the Beautifier when you just want readable output; use the Formatter when you also need to validate, fix, explore, or share.
Can I choose 4-space indentation instead of 2?
The beautifier uses 2-space indentation by default, which matches the most common JSON convention. If you need 4-space indentation, use the JSON Formatter which exposes indentation options.
What happens to duplicate keys when I beautify?
They collapse. JSON technically allows an object to list the same key twice, but when the beautifier parses it, only the last value for that key survives — so {"a":1,"a":2} beautifies to {"a": 2}. This is standard JSON.parse behavior and is worth knowing, because a duplicated key silently loses data rather than raising an error.
Does beautifying change my data at all?
The values are preserved, but two representational things are normalized because the tool parses and re-serializes: numbers take their canonical form (1.0 becomes 1) and unicode escapes like é are decoded to the actual character (é). The meaning is identical; only the text form of numbers and escaped characters may differ.