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JSON Validator

Check whether JSON is valid, find the syntax error, and see what the document contains.

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How to Validate JSON Online

Paste your JSON into the input panel and click Convert. If the JSON is valid you'll see a confirmation and a summary of its structure; if not, you'll see the precise error so you can fix it fast.

Why Validate JSON?

A single misplaced comma or bracket breaks an entire JSON document. Validating before you ship config files, API payloads, or data exports saves debugging time and prevents runtime failures.

Fixing Invalid JSON

Once you've located the error, use the JSON Formatter to clean up indentation, or the JSON Compare tool to diff against a known-good version.

Frequently Asked Questions

Is this a JSON linter or a JSON checker?

Those are the same job under different names, and this tool does it: it parses your JSON, reports the first syntax error with the parser's message, and describes what the document contains. What it deliberately does not do is enforce style rules such as key ordering or indentation preferences, so it will never call valid JSON a problem.

How does the JSON validator work?

It attempts to parse your input as JSON. If it succeeds, you get a confirmation plus a summary of the top-level structure. If it fails, you get the exact syntax error message.

What are common JSON errors it catches?

Trailing commas, missing or mismatched brackets and braces, unquoted keys, single quotes instead of double quotes, and stray characters are the most common issues the validator flags.

Is my data sent anywhere?

No. Validation runs entirely in your browser. Your JSON never leaves your device.

Does it validate against a JSON Schema?

This tool checks JSON syntax (is it well-formed?), not schema conformance. It confirms the document parses and reports its structure.

Related Tools

JSON Formatter & Beautifier

Format, beautify, and validate JSON in one pass, with the exact location of any syntax error.

JSON Fixer

Repair almost-JSON: trailing commas, single quotes, unquoted keys, comments, and Python literals.

JSON Diff & Compare

Compare two JSON documents and see exactly which keys were added, removed, or changed.