JSON Validator

Validate JSON input instantly and view the formatted result or error message. This tool helps you check syntax, spot problems, and reformat valid JSON for easier reading.

Paste your input above or import a file below.
No file chosen
Supported file types: .txt, .json, .csv, .tsv, .log, .md, .xml, .yaml, .yml, .ini, .html, .htm
Total characters: 0

How to Use:

  1. Paste or import your JSON text.
  2. The tool checks if the input is valid JSON.
  3. See either formatted output or a clear error message.
  4. Use Copy or Export to save the result.

What JSON Validator Tool can do:

  • Validates JSON input and shows formatted output.
  • Highlights syntax errors and explains what went wrong.
  • Supports file import/export and live character counting.

Example:

Input:

{ "name": "Alice", "age": 30, }

Output:

Invalid JSON: Unexpected token } in JSON at position ...

Correct Input Output:

{
  "name": "Alice",
  "age": 30
}

Common Use Cases:

Ideal for developers, analysts, and anyone needing to check or clean JSON content before using it in APIs, config files, or data pipelines. Helps avoid runtime errors from malformed data.

Useful Tools & Suggestions:

If you’re checking structure, JSON Prettifier makes your data readable before you even look for issues. And once everything checks out, Convert JSON to CSV can help move that data into a spreadsheet-friendly format without the headache.

Related Tools