Data tool

JSON Validator

Check JSON syntax and pinpoint errors immediately.

Fast browser processing Private — no uploads Free to use
HOW IT WORKS

Use JSON Validator in three simple steps

1

Add content

Paste or import a UTF-8 file up to 5 MB, or load an example.

2

Validate syntax

Run the action below the editors. Review any error before continuing.

3

Review the status

Fix reported errors and validate again. Editing clears the previous status.

ABOUT THIS TOOL

JSON Validator

Check JSON syntax and pinpoint errors immediately.

It means the syntax is valid. This tool does not validate a schema, required fields or business rules. Duplicate property names are not flagged.

FAQ

Frequently asked questions

Does valid JSON mean the data is correct?

It means the syntax is valid. This tool does not validate a schema, required fields or business rules. Duplicate property names are not flagged.

How do I find an error?

The parser message is shown. When it includes a character position, the tool reports its line and column and selects the location in the input.

Is this tool free and private?

Yes. No account is needed, and your input is processed locally in your browser without being uploaded to FormatKit.