What makes JSON invalid?

Common JSON errors include missing quotes around keys, using single quotes instead of double quotes, trailing commas after the last item in an array or object, and missing brackets or braces.

Can I format large JSON files?

Yes, our tool can handle large JSON files. Since it runs entirely in your browser, the performance depends on your device's processing power rather than server limits.

Is my JSON data secure?

Absolutely. All formatting and validation happen locally in your browser. Your data is never sent to our servers, ensuring complete privacy for sensitive information.

JSON

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XML

📄

YAML

JSON vs XML vs YAML

Three data formats, different strengths. Learn when to use each for APIs, configuration, and data exchange.

Quick Verdict

Use JSON for

APIs, web services, general data interchange

Use YAML for

Config files, DevOps, human-edited files

Use XML for

Documents, SOAP, legacy systems

Same Data, Three Formats

JSON~150 bytes

{
  "name": "John Doe",
  "age": 30,
  "active": true,
  "skills": ["JS", "Python"],
  "address": {
    "city": "NYC",
    "zip": "10001"
  }
}

XML~280 bytes

<?xml version="1.0"?>
<person>
  <name>John Doe</name>
  <age>30</age>
  <active>true</active>
  <skills>
    <skill>JS</skill>
    <skill>Python</skill>
  </skills>
  <address>
    <city>NYC</city>
    <zip>10001</zip>
  </address>
</person>

YAML~100 bytes

name: John Doe
age: 30
active: true
skills:
  - JS
  - Python
address:
  city: NYC
  zip: "10001"

Feature Comparison

Feature	JSON	XML	YAML
File extension	.json	.xml	.yaml, .yml
Data types	6 types (string, number, bool, null, object, array)	Everything is a string	Rich types + custom tags
Comments	Not allowed	<!-- comment -->	# comment
Readability	Good	Verbose	Excellent
Parse speed	Fastest	Moderate	Slowest
Schema support	JSON Schema	XSD, DTD	JSON Schema compatible
Namespace support	No	Yes	No
References	No	No	Yes (anchors)