Developer Tasks
JSON Formatting and Validation Guide
Make JSON readable, find syntax errors, choose indentation, and minify only after validating the structure.
Short answer
Parse and validate JSON before formatting or minifying it. Common failures include trailing commas, single-quoted strings, missing quotes around keys, mismatched brackets, and unescaped characters.
Key takeaways
- Valid JSON requires double-quoted strings and property names.
- Formatting changes whitespace, not the data structure.
- Minify only after validation and keep a readable copy for debugging.
- Do not paste secrets or personal data into tools you do not trust.
Common syntax errors
JSON is stricter than JavaScript object notation. Comments, trailing commas, functions, undefined values, and single quotes are not valid standard JSON.
- Trailing comma
- Missing double quote
- Unescaped line break
- Mismatched brace or bracket
- Comment inside JSON
Format, validate, and minify
Validation confirms that the text can be parsed. Formatting adds indentation for people. Minification removes unnecessary whitespace for transfer or storage.
| Action | Use | Risk |
|---|---|---|
| Validate | Find structural errors | None when input remains local |
| Format | Review and debug | Larger text size |
| Minify | Compact transfer | Harder for people to inspect |
Handle sensitive data carefully
Remove access tokens, customer records, internal URLs, and credentials before sharing JSON or using an unfamiliar online service.
Official references
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JSON Formatter
Validate, format, and minify JSON instantly