JSON Validator

• JSON Formatter
• JSON Minifier
• JSON Viewer
• JSON Tools

This free JSON validator checks whether your text is valid JSON. Paste or upload JSON and click Validate to get an instant pass or fail. When valid, you see the root type (Object or Array) and size (number of keys or items). When invalid, you see the parser error, character position or line number, and a snippet of the text around the error so you can fix it. A link to the JSON Formatter is shown when validation fails so you can pretty-print and correct syntax. All processing runs in your browser; nothing is sent to a server.

• Instant validation: One click to parse and report valid or invalid. No round-trip to a server.
• Error details: Invalid JSON shows the error message, position or line, and a short snippet around the error location.
• Valid summary: Valid JSON shows root type (Object or Array) and size—e.g. 5 keys or 12 items—so you can confirm structure quickly.
• Paste or upload: Paste from clipboard or upload a .json file (including drag-and-drop). Clear button resets input and result.

Powered by browser APIs and client-side processing.

Invalid JSON breaks APIs, configs, and data pipelines. Checking syntax before sending or saving catches typos, missing commas, trailing commas, and unescaped characters. This validator gives you the exact position and a snippet so you can fix the problem without guessing. When validation fails, use the JSON Formatter to beautify and correct the structure. All checks run locally, so your data stays private.

• Valid: A green result with root type (Object or Array) and size (e.g. 5 keys, 10 items).
• Invalid: A red result with the error message, position or line, a snippet around the error, and a link to the JSON Formatter.