JSON Validator

Validate JSON syntax online for free. Instantly check if your JSON is valid with detailed error messages showing exactly where the issue is.

Your data never leaves your browser

JSON Formatter & Beautifier

Format and validate JSON with syntax highlighting online

JSON Minifier & Compressor

Remove whitespace from JSON to reduce its file size

JSON Diff & Compare

Compare two JSON objects and highlight differences

Frequently Asked Questions

How do I validate JSON?

Paste your JSON in the input field and click Validate. ToolHive will instantly tell you if it's valid or show you the exact error location.

What makes JSON invalid?

Common issues: missing quotes around keys, trailing commas, single quotes instead of double quotes, unescaped special characters, or mismatched brackets.