Validate JSON online
Paste JSON to check whether it's valid. If it isn't, you'll see the exact error and where parsing failed; if it is, you get a quick report of its type, key count and nesting depth — saved privately in your account.
No sign-up needed — runs instantly in your browser.
How it works
- 1Paste your JSON
- 2Press Run to validate it
- 3Read the result or find the report in your files
Frequently asked questions
- What do I get if the JSON is valid?
- A short report with the top-level type, total key count, maximum nesting depth and byte size.
- What happens with invalid JSON?
- You'll get a clear error message pointing to where parsing failed, so you can fix it quickly.
Related tools
Paste JSON to pretty-print, minify or validate it. Choose the indentation, optionally sort keys, and your formatted file is stored privately in your account.
DeveloperPaste CSV and turn it into JSON. With a header row, each record becomes an object keyed by the column names; without one, each record is an array of values. Choose the delimiter and indentation — your file is stored privately in your account.
DeveloperPaste any text to convert it to Base64. Enable URL-safe output for tokens and query strings. The result is stored privately in your account.
DeveloperPaste Base64 to decode it back to readable text. Both standard and URL-safe Base64 are accepted. The result is stored privately in your account.
Developer