The fastest path to valid JSON

Invalid JSON blocks deployments, breaks API clients, and wastes review cycles. Most failures come from a small set of repeatable mistakes.

Top syntax mistakes

• Trailing commas after the last array or object item
• Single-quoted strings (JSON requires double quotes)
• Unescaped newlines inside string values
• Comments (// or / /) — not valid in strict JSON

A practical validation workflow

1. Paste the payload into a formatter with error highlighting.
2. Fix the reported line and column first — do not guess.
3. Re-run validation after each fix.
4. Add schema validation (Zod, JSON Schema) at API boundaries.

Use the JSON Formatter to beautify, minify, and catch syntax errors before production.