JSON Formatter

A JSON formatter parses JSON text and serializes the resulting value with consistent whitespace. This tool can pretty-print with the selected indentation, minify the result, and optionally sort object keys recursively. RFC 8259 requires double-quoted object names and strings; comments, trailing commas, NaN, and Infinity are outside the JSON grammar. Formatting changes presentation, not the intended data meaning.

Use the formatter when you need to inspect or normalize JSON during development:

• Make a compact API response, webhook body, configuration, or log entry easier to read.
• Minify valid JSON before copying it into a request, test fixture, or environment variable.
• Sort keys for a more predictable manual comparison between two objects.
• Expose parse errors caused by missing commas, mismatched brackets, or invalid quotation marks.
• Treat a successful parse as a syntax check only. It does not apply JSON Schema, API contracts, required fields, domain types, or business rules.

Input {"active":true,"user":{"id":42,"roles":["admin","editor"]}} becomes an indented object whose nested user value and roles array are visible at a glance. Minifying produces the compact form again. If the input contained a trailing comma, the browser parser would reject it instead of silently repairing the document.

• Parsing uses JavaScript numbers, so integers beyond the reliably representable range can lose precision.
• Duplicate object names may collapse during parsing; avoid parse-and-reserialize workflows when duplicate preservation matters.
• Sorted output is convenient, but it is not a cryptographic JSON canonicalization format and should not be used to prepare signed data.
• Processing runs in the browser. Sensitive JSON can still be exposed through clipboard history, browser extensions, screen sharing, or a shared device.