What Does JSON Formatting Do?

Whitespace reveals structure

JSON formatting inserts indentation and line breaks between tokens. It makes nested objects and arrays easier to follow. It does not change the intended data or correct an incorrect value.

For example, separating an array across lines makes missing entries easier to spot. Minification does the reverse by removing unnecessary whitespace outside strings.

References: RFC 8259: JSON grammar

Read the nesting

The following object has an order containing a numeric identifier and an items array. The same data can appear on one line; indentation makes the containment easier to scan.

The large identifier is intentional. A formatter that parses into JavaScript numbers and serializes again could round it. Edit All preserves the original number token.

{
  "order": {
    "id": 9007199254740993,
    "items": [
      "book",
      "pen"
    ]
  }
}

Know what must remain untouched

Whitespace inside quoted strings is data. The value "New York" must not become "NewYork" when minified. Escaped characters also need to remain properly encoded.

The formatter first validates syntax and then rewrites whitespace outside strings. It preserves the original key order and numeric spelling.

1. Paste a complete JSON value or open a JSON file.
2. Choose Format JSON and inspect nesting with two or four spaces.
3. Use Minify when you need a compact copy; whitespace inside strings remains.
4. Copy or download the result. An error requires an input correction before a result is produced.

Formatting is not repair

A trailing comma or unquoted key prevents valid formatting. Read the reported location, inspect the preceding token, and correct the intended syntax. For application-specific requirements, use a schema validator or the application’s own checks.

Distinguish formatting, syntax validation, and schema checks →