Paste your JSON and instantly format, validate, and beautify it with syntax highlighting and clear error reporting. Runs entirely in your browser.
Three steps. No signup required.
Drop raw, minified, or messy JSON into the input panel on the left.
We auto-format on paste and flag syntax errors with line and column numbers.
Grab the beautified output, or minify it for production payloads.
Everything runs in your browser. Your JSON never leaves your device.
Auto-format on paste with precise error messages and JSON stats.
Syntax-highlighted, indented JSON that's easy to scan and review.
A JSON formatter takes raw or minified JSON and rewrites it with consistent indentation, line breaks, and spacing so it's easy to read, review, and debug.
No. MyToolsBag's JSON Formatter runs entirely in your browser. Your data never leaves your device, which makes it safe for sensitive payloads.
Paste your JSON and MyToolsBag highlights the line and column of the first error along with a description. Common fixes include adding missing commas, closing brackets, or wrapping keys in double quotes.
Formatting (or beautifying) adds indentation and line breaks so JSON is easy for humans to read. Minifying strips every optional space and newline so it's as small as possible over the wire. Use the same tool for both — indent your JSON in your editor, minify it before sending it in an API request or storing it.
Use JSON.stringify(value, null, 2). The third argument controls indentation — pass 2 for two spaces or "\t" for tabs. To pretty-print an existing JSON string, parse it first: JSON.stringify(JSON.parse(rawString), null, 2).
The most common causes are trailing commas (JSON doesn't allow them), single quotes instead of double quotes around strings and keys, unquoted keys, comments (also not allowed in strict JSON), and unescaped newlines inside strings. Our validator points to the exact character so you don't have to guess.
Yes, up to whatever your browser's memory allows — practically tens of megabytes without issue. For gigabyte-scale files you'll want a streaming parser instead of a browser tool.
The formatter is strict JSON by default (the RFC 8259 spec that servers and browsers agree on). JSON5 (with comments and trailing commas) and NDJSON (newline-delimited JSON, one object per line) will fail validation — clean those to strict JSON first.