JSON Formatter & Beautifier.

Format and beautify JSON online — free and private

A JSON formatter turns minified, escaped, or hand-edited JSON into clean, indented, human-readable text. Paste your JSON above, choose how deep you want the indentation, and press Format JSON to instantly beautify it. Because the whole thing runs client-side, you can pretty-print JSON online without ever sending sensitive data to a server.

How to format JSON in three steps

1. Paste your JSON into the input, or click “Load sample” to try it.
2. Choose an indent — 2 spaces, 4 spaces, or tabs.
3. Format and export — copy the beautified JSON or download it as data.json.

Formatting never changes your data

This is worth stating plainly, because people worry about it: JSON parsers ignore whitespace between tokens entirely. Adding indentation and line breaks changes how the document looks, never what it means. These two documents parse to exactly the same object:

{"user":{"name":"Ada","roles":["admin","dev"],"active":true}}

{
  "user": {
    "name": "Ada",
    "roles": ["admin", "dev"],
    "active": true
  }
}

Same keys, same values, same order, same types. So it is always safe to format a file before committing it — you are not touching the data.

2 spaces, 4 spaces, or tabs?

It makes no difference to the data, so this is purely about matching your codebase. Two spaces is the web and JavaScript default — it is what JSON.stringify(data, null, 2) and Prettier emit, and what most package.json files use. Four spaces is common in Python and Java projects. Tabs are valid too.

The only rule that actually matters: be consistent. Mixed indentation produces noisy git diffs where reformatting hides the real change.

Format JSON in your editor or the terminal

JavaScript — the third argument to JSON.stringify is the indent:

JSON.stringify(data, null, 2);      // 2-space pretty-print
JSON.stringify(data, null, "\t");   // tabs
JSON.stringify(data);               // minified (no third argument)

Python:

import json
print(json.dumps(data, indent=2, ensure_ascii=False))

Pass ensure_ascii=False or Python escapes every non-ASCII character into \\uXXXX, which makes accented text unreadable.

Command line — no install needed if you have Python:

jq . data.json                        # pretty-print with jq
python3 -m json.tool data.json        # pretty-print with the stdlib

Why formatted JSON matters for git

A minified JSON file is one enormous line. Change a single field and git reports that the entire line changed — which is the entire file. Code review becomes impossible, and merge conflicts become unresolvable.

Pretty-printed JSON puts each key on its own line, so a one-field change shows as a one-line diff that a reviewer can actually read. The rule of thumb: format what you commit, minify what you ship. Use the JSON minifier at build time for the network payload, and keep the repository copy readable.

Why use this JSON beautifier?

Unlike many online formatters that quietly upload your payload, this tool processes everything locally. It validates before it formats, so invalid JSON is caught with the exact line and column of the error instead of producing broken output. Need the opposite? Use the JSON minifier to compress, the JSON validator to check syntax, or the JSON viewer to explore structure as a tree.

Formatting is often the last step rather than the first. If you are working with several files at once, you can merge JSON files into a single document and then pretty-print the result here — combining first and formatting second saves reconciling indentation across sources that never agreed on it.