JSON Formatter & Validator
Format, validate, and beautify JSON, in your browser.
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Frequently asked questions
No. Formatting, minifying, and validation all run in your browser with the built-in JSON parser. Nothing you paste is sent to a server, so it is safe to use with private data.
Beautify pretty-prints your JSON with line breaks and your chosen indentation (2 spaces, 4 spaces, or a tab) so it is easy to read. Minify removes all insignificant whitespace to produce the smallest valid JSON on a single line.
The tool parses your input with the standard JSON parser. If it is well-formed you see a "Valid JSON" confirmation; if not, you get the parser's error message, which usually points to the character position where parsing failed.
No. The tool follows the strict JSON specification, so comments, single quotes, and trailing commas are reported as errors. Remove them to get valid JSON.
Last updated 2026-06-23.