About JSON Validator

Validates JSON syntax using the browser’s native JSON.parse, pinpoints errors to the exact line and column, and provides formatting, minification, and structural analysis. The editor shows line numbers and highlights parse errors with position data extracted from the error message. Valid JSON gets a full statistical breakdown: total keys, nesting depth, and type distribution across objects, arrays, strings, numbers, booleans, and nulls. Format with configurable indentation (2, 4, or 8 spaces), minify to remove all whitespace, or download the result.

• Error location extracted from JSON.parse error messages—reports line and column when available
• Format with 2, 4, or 8 space indentation; minify strips all whitespace
• Structure analysis: total keys, max nesting depth, and count of each JSON type
• Toggle between original input and formatted view with optional line numbers
• Character count, line count, and minified size displayed in real time

Frequently Asked Questions

Why does the error sometimes not show a line number?

Different browsers format JSON.parse error messages differently. Chrome includes a position offset that gets converted to line/column. Firefox and Safari may only include a position number. The tool extracts what it can from the error string.

What’s the difference between this and the JSON Schema Validator?

This validates syntax—is it well-formed JSON? The schema validator checks semantics—does the JSON conform to a specific structure definition? Use this tool first to confirm parsability, then the schema validator to verify the data matches your expected shape.