JSON Validator

Quickly validate JSON data and get detailed error messages with line and column numbers. Also formats valid JSON for readability.

Input

0 chars · Ctrl+Enter to process
Output
0 chars

Drop a .json file here to load it

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Frequently Asked Questions

What makes JSON invalid?

Common JSON errors include: trailing commas, unquoted keys, single-quoted strings, comments (not supported in standard JSON), and mismatched brackets or braces.

How do I fix a JSON parse error?

Look at the error message for line and column numbers. Common fixes: wrap all keys in double quotes, replace single quotes with double quotes, remove trailing commas, and remove JavaScript comments.

What is the difference between JSON and JavaScript objects?

JSON is a strict subset of JavaScript. JSON requires double-quoted keys, does not support undefined, functions, or comments, and has no trailing commas.

Can I validate JSON5 or JSONC (JSON with comments)?

This tool validates standard JSON (RFC 8259). JSON5 and JSONC are supersets — they are not valid standard JSON. Most APIs and config parsers require strict JSON.

About JSON Validator

Quickly validate JSON data and get detailed error messages with line and column numbers. Also formats valid JSON for readability.

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