JSON Formatter & Validator

No. Everything runs entirely in your browser. Your data never leaves your device -- no server requests, no storage, no analytics on content.

The validator catches all JSON syntax errors: missing commas, unquoted keys, trailing commas, mismatched brackets, invalid escape sequences, and more. Error messages include the line number and character position.

Yes. Click "Minify" to remove all whitespace and produce the most compact representation. Useful for API payloads or configuration files.

The formatter handles JSON up to several megabytes with no issue since processing is done by the browser's native JSON.parse engine. For files over 10 MB, performance depends on your device. If you need to inspect a very large file, consider using jq on the command line.

jq is a command-line tool with a full query language for filtering and transforming JSON. This tool is browser-based and focused on instant formatting and validation -- no installation, no terminal required. For quick inspection and sharing, this is faster; for scripting and automation, use jq.

Yes. The tool formats JSON with proper indentation at any nesting depth. There is no artificial nesting limit -- the only constraint is the browser's call stack for extremely deep recursive structures, which is rare in practice.

Yes. The interface is fully responsive with a stacked layout on small screens. You can paste JSON, format or minify it, and copy the output on any phone or tablet.

Yes. Paste an API response directly to check if it is valid JSON. The tool highlights syntax errors with line numbers, making it easy to spot truncated responses, encoding issues, or malformed payloads during API development.

No. This tool validates strict JSON per RFC 8259. JSON5 features like trailing commas, unquoted keys, and comments will trigger validation errors. If you work with JSON5, strip comments and normalize the syntax first, then paste here.

The tool uses 2-space indentation by default, which is the most common convention for JSON. If you need 4-space or tab indentation, format here first, then find-and-replace the indent in your editor.

Yes. In the formatted tree view, click any value to see its JSON path (e.g., $.data[0].name). This is useful for writing jq queries, JSONPath expressions, or JavaScript property access chains.

The <a href="/ai/dev/csv-to-json">CSV to JSON Converter</a> produces JSON you can validate here. The <a href="/ai/dev/jwt">JWT Decoder</a> decodes JWT payloads into formatted JSON. The <a href="/ai/dev/json-to-csv">JSON to CSV Converter</a> exports JSON arrays to spreadsheet-friendly CSV.