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Processed locally in your browser

JSON Validator

Check your JSON, pinpoint syntax errors, and explore every object and array in an interactive tree.

{ }
Your JSON, made clear.Format, validate, and explore. Everything stays on your device.
0 characters · 1 line
JSON only · Up to 1 MB Ctrl / ⌘ + Enter to run
Ready when you are
Explore your data
{ }A little structure goes a long way.

Paste JSON to explore objects, arrays, and values.
Or load the example to see how it works.

$

What Does a JSON Validator Check?

A JSON validator parses your text against the JSON specification and reports whether it's syntactically correct. If it's invalid, this tool points to the exact line and column where parsing failed, so you can fix it quickly.

Example Calculation

{"name": "ToolSprouts",} is invalid JSON because of the trailing comma — the validator flags exactly where the error occurs.

How to Use This Tool

  1. Paste your JSON into the input box.
  2. Click Validate JSON.
  3. Review the status, jump to any error, or expand the tree to inspect values.

Common Use Cases

Checking hand-written JSON before using it in code
Debugging malformed API payloads
Verifying configuration files
Teaching or learning JSON syntax

Related Tools

JSON FormatterFormat, indent and beautify JSON with error detection.

Frequently Asked Questions

Does this tool fix invalid JSON automatically?

No, it identifies where the problem is so you can fix it. For formatting valid JSON, use the JSON Formatter tool.