JSON Validator

About the JSON Validator

The JSON Validator checks your JSON for syntax errors and optionally pretty-prints the output for easier reading. It’s ideal for debugging APIs, config files, and structured data used across web apps.

Why use a JSON Validator?

• Instantly detect malformed JSON and pinpoint error positions
• Pretty-print (format) valid JSON for readability
• Minify JSON to reduce size for production if needed
• Helpful for API responses, config files, and data pipelines

How to use the tool

1. Paste your JSON into the input area.
2. Click Validate to check the syntax.
3. If valid, use Format to pretty-print or Minify to compress.

Examples

Valid JSON: { "name": "Alex", "age": 28, "skills": ["js", "python"] }
Invalid JSON (trailing comma): { "name": "Alex", "age": 28, }

Tips

• Ensure keys are in double quotes, not single quotes.
• No trailing commas after the last item in objects/arrays.
• Use null, true, false in lowercase.

Need structure validation? Pair syntax validation with a JSON Schema checker to ensure your data meets expected shapes.