JSON Formatter Online

Paste your raw JSON into the Input box and click Format / Beautify for clean, indented output — or Minify to compress it to a single line. Click Validate to check syntax without changing the data. Everything runs in your browser; nothing is sent to any server.

What is JSON formatting?

JSON (JavaScript Object Notation) is a lightweight data-interchange format defined in RFC 8259. Raw JSON returned from APIs is often a single long line with no whitespace — hard to read and impossible to debug at a glance. Formatting (also called prettifying or beautifying) rewrites that output with consistent indentation and newlines so the structure is immediately visible. This tool uses 2-space indentation, matching the JSON.stringify(obj, null, 2) convention used in most JavaScript projects.

Minification does the reverse: it strips all non-essential whitespace to produce the smallest possible JSON string. Minified JSON is preferred in HTTP request bodies, API payloads, and configuration files where size matters.

How to use this tool

1. 1Paste or type your JSON into the Input JSON textarea. You can paste a full API response, a config snippet, or any valid JSON string.
2. 2Click Format / Beautify to indent the JSON, Minify to compress it, or Validate to check whether the JSON is syntactically valid without modifying it.
3. 3The result appears in the Output box. Click Copy to copy it to your clipboard.

Code examples

const raw = '{"name":"Alice","age":30,"active":true}';
const parsed = JSON.parse(raw);

// Beautify (2-space indent)
const pretty = JSON.stringify(parsed, null, 2);

// Minify
const compact = JSON.stringify(parsed);

import json

raw = '{"name":"Alice","age":30,"active":true}'
obj = json.loads(raw)

# Beautify
pretty = json.dumps(obj, indent=2)

# Minify
compact = json.dumps(obj, separators=(',', ':'))

curl -s https://api.example.com/data | python3 -m json.tool

Frequently asked questions

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