How to Format and Validate JSON Data
Malformed JSON causes silent failures in APIs and configuration files. Learn how to format, validate, and debug JSON documents to prevent integration errors and improve readability.
Key Takeaways
- A single misplaced comma or missing quote can break an entire JSON document.
- JSON does not allow trailing commas after the last item in an array or object.
- Use consistent indentation (2 or 4 spaces) for readability.
- For structured validation, use JSON Schema to define expected types, required fields, value constraints, and nested object structures.
- ## Formatting Best Practices ### Indentation Use consistent indentation (2 or 4 spaces) for readability.
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Why JSON Validation Matters
A single misplaced comma or missing quote can break an entire JSON document. Unlike XML, JSON has no schema validation by default, so structural errors are only caught at parse time.
Common JSON Errors
Trailing Commas
JSON does not allow trailing commas after the last item in an array or object. This is the most common syntax error, especially when editing JSON by hand.
Single Quotes
JSON requires double quotes for strings. Single quotes are valid in JavaScript but not in JSON.
Unquoted Keys
Object keys must be double-quoted strings. Unquoted keys work in JavaScript objects but not in JSON.
Comments
Standard JSON does not support comments. If you need comments, consider JSONC (JSON with Comments, used by VS Code) or JSON5.
Formatting Best Practices
Indentation
Use consistent indentation (2 or 4 spaces) for readability. Tabs work but spaces are more universally displayed consistently.
Key Ordering
Alphabetically ordered keys make it easier to find values in large documents and produce more predictable diff outputs in version control.
JSON Schema
For structured validation, use JSON Schema to define expected types, required fields, value constraints, and nested object structures. Many editors provide autocomplete and validation when a schema is available.
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