Raw JSON Input
Waiting for JSON content
Start typing on the left or load one of the sample payloads to inspect it instantly.
PrettyJSON
Instantly clean, validate, and inspect web payloads
Sample Payloads
RFC 8259 Compliant & 100% Client-Side
Online JSON Repair & Auto-Fix Tool
Automatically fix broken JSON online. Auto-repair single quotes, missing key quotes, trailing commas, JavaScript comments, and Python literals (`True`, `None`).
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.
How does the JSON Auto-Repair Engine work?
PrettyJSON features a 20-step master repair pipeline. It converts single quotes to double quotes, quotes unquoted keys, strips JS/hash comments, removes trailing and double commas, fixes unclosed brackets, and replaces Python literals (`True`, `None`).
Can PrettyJSON convert Python dictionaries into valid JSON?
Yes! Python dictionaries often use single quotes (`{'key': 'val'}`) and Python literals (`True`, `False`, `None`). Clicking Auto-Repair instantly converts them into valid JSON (`{"key": "val", "active": true, "data": null}`).
How does Auto-Repair handle extra closing braces?
If trailing closing braces or garbage log wrappers cause unexpected character errors, Auto-Repair iteratively isolates the root valid JSON structure and pops excess characters automatically.