JSON Formatter

Validate JSON syntax, format with two-space indentation, or minify a parsed document.

How to Use

Paste JSON

Paste a JSON value, object, or array. Avoid sensitive production data when a small sample is enough.

Choose Format or Minify

Format adds two-space indentation. Minify serializes without optional whitespace.

Check values, then copy

Verify important identifiers and numbers, especially large integers or duplicate object keys.

What formatting does

The formatter uses JSON.parse followed by JSON.stringify. Formatting uses two-space indentation; minification removes optional whitespace from the serialized result. No data schema or business rules are checked.

Try this input

{"name":"Sample","enabled":true,"tags":["alpha","beta"]}

The formatted result retains a string, boolean, and array. A trailing comma or a comment produces a syntax error; this tool does not guess a correction.

How It Works

Format: JSON.stringify(JSON.parse(input), null, 2) Minify: JSON.stringify(JSON.parse(input)) JavaScript numbers have finite precision. Duplicate object keys retain the final value. Formatting does not preserve original bytes or signed payloads.

Frequently Asked Questions

Does valid JSON mean my API request is valid?▼

No. Valid syntax does not establish that required fields, types, or application rules are satisfied.

Why can a large number change?▼

JavaScript integers above 9,007,199,254,740,991 may lose precision. Encode exact large identifiers as strings at the data source.

Are comments and trailing commas accepted?▼

No. They are not valid JSON syntax.

Limits and assumptions

Not a JSON Schema validator or automatic syntax repair tool.
Can change number spelling, property order, duplicate keys, and unsafe integer values.
Large documents use browser memory; original bytes and signatures are not preserved.

Worked guides

Format JSON while checking syntax and important values

References

Documentation updated on 2026-10-04. How we review tools

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