JSON for Beginners: Structure, Data Types, and Common Errors
Read a JSON file without being a software developer.
What it does and when to use it
JSON is a text format for objects and lists. Keys and strings use double quotes, and structures must close correctly.
What information to enter
Paste text and inspect brackets, commas, quotes, and value types. Formatting with indentation reveals hierarchy.
How to understand the result
Valid JSON is not necessarily correct data; a validator checks syntax, not business meaning.
Recommended step-by-step workflow
- Check the assumptionsJSON is a text format for objects and lists. Keys and strings use double quotes, and structures must close correctly.
- Use matching unitsPaste text and inspect brackets, commas, quotes, and value types. Formatting with indentation reveals hierarchy.
- Compare with another scenarioValid JSON is not necessarily correct data; a validator checks syntax, not business meaning.
Short example
{"name":"Dana","age":30} is valid; an unquoted key or trailing comma may fail a standard parser.
Common mistakes
- Using single quotes instead of double quotes.
- Assuming undefined is a valid JSON value.
Frequently Asked Questions
Object vs array?
An object is key-value pairs; an array is an ordered list.
Are comments allowed?
Not in standard JSON. Some extended formats allow them, but they are not ordinary JSON.
Are my personal inputs saved?
No. The calculators and guides are designed for quick browser use without storing your personal input values.