Raw JSON Input
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PrettyJSON
Instantly clean, validate, and inspect web payloads
Sample Payloads
RFC 8259 Compliant & 100% Client-Side
Online JSON Formatter & Beautifier
Instantly format JSON and beautify JSON payloads with clean 2-space or 4-space indentation. RFC 8259 compliant, 100% in-browser processing, zero server upload.
Explore Specialized JSON Tools
JSON Formatter
Format & beautify raw JSON with 2-space or 4-space indentation.
JSON Minifier
Compress JSON payloads onto 1 line & calculate bandwidth savings.
JSON Validator
Real-time RFC 8259 syntax checker with exact line & column error pinpointing.
JSON Tree Viewer
Inspect nested API responses with interactive node expansion & key search.
JSON Repair
Auto-FixAuto-fix single quotes, trailing commas, unquoted keys, and JS comments.
100% Private & Offline Ready
No backend requests. Your sensitive payloads remain strictly on your local device.
Zero Network Latency
Instantaneous formatting, minification, repair, and tree view rendering with zero server roundtrips.
Exact Error Line Pinpointing
Detect unescaped quotes, trailing commas, and structural syntax errors with exact line & column markers.
PrettyJSON vs. Traditional Online JSON Editors
See how PrettyJSON outperforms older web formatters in privacy, performance, and developer utility.
| Feature | PrettyJSON.in | Traditional Editors |
|---|---|---|
| Privacy & Security | 100% In-Browser (0 Server Logs) | Often Uploads to Server |
| Speed & Performance | Instant Local JS / Web Processing | Network Request Latency |
| View Modes | Interactive Text & Tree View | Text Only |
| JSON Auto-Repair | Built-in Auto-Fix Engine | Manual Editing Only |
| Error Handling | Exact Line & Column Highlighting | Generic Error Messages |
Programmatic JSON Pretty Printing Examples
How to format and beautify JSON programmatically across languages and command line tools.
JavaScript (Browser / Node.js)
const data = { name: "PrettyJSON", rating: 5, active: true };
// Pretty print with 2-space indentation
const formatted = JSON.stringify(data, null, 2);
console.log(formatted); Python
import json
data = {"name": "PrettyJSON", "rating": 5, "active": True}
# Pretty print with 2-space indentation
formatted = json.dumps(data, indent=2)
print(formatted) cURL & jq (Command Line)
# Fetch API response and beautify instantly with jq
curl -s https://api.example.com/data | jq '.'
# Compact / Minify JSON output
curl -s https://api.example.com/data | jq -c '.'Frequently Asked Questions
Common questions and expert answers regarding this tool.
What is a JSON Formatter & Beautifier?
A JSON Formatter transforms messy or minified JSON strings by inserting structural newlines and indentation (2 or 4 spaces), making complex nested objects instantly readable for human inspection.
Why should I use 2-space vs 4-space indentation?
2-space indentation is the industry standard for REST APIs, Web Frameworks, and config files because it saves horizontal screen real estate for deeply nested JSON objects. 4-space indentation is preferred in Python-heavy or CLI environments.
Does formatting JSON alter data types or key ordering?
No. PrettyJSON strictly preserves all data types (numbers, strings, booleans, null, arrays, objects) and key orders according to the RFC 8259 specification.