JSON Formatter & Validator
Format, validate, and beautify JSON data.
Formatted JSON will appear here...JSON Formatter is a free browser-based tool that instantly beautifies or minifies JSON data. It parses your raw JSON string, checks it for syntax errors, and renders it with proper indentation and color-coded syntax highlighting β making even the most deeply nested structures easy to read.
Paste your JSON into the input field, then click Format to produce nicely indented output, or Minify to compress it into a single line for use in production environments. The validator highlights exactly where a syntax error occurs so you can fix it without guessing.
This tool runs entirely in your browser β no data is ever sent to a server. It is ideal for debugging API responses, editing configuration files, and preparing JSON payloads before sending them to a service.
Frequently Asked Questions
Code Implementation
import json
# Format (pretty-print) a JSON string
raw = '{"name":"Alice","age":30,"hobbies":["reading","coding"]}'
data = json.loads(raw)
# Indent with 2 spaces
pretty = json.dumps(data, indent=2)
print(pretty)
# {
# "name": "Alice",
# "age": 30,
# "hobbies": ["reading", "coding"]
# }
# Sort keys alphabetically
sorted_json = json.dumps(data, indent=2, sort_keys=True)
# Minify (compact)
minified = json.dumps(data, separators=(',', ':'))
print(minified)
# {"name":"Alice","age":30,"hobbies":["reading","coding"]}
# Format a JSON file in-place
with open('data.json', 'r') as f:
obj = json.load(f)
with open('data.json', 'w') as f:
json.dump(obj, f, indent=2)Comments & Feedback
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