Format (pretty-print) or minify JSON and validate it against RFC 8259, with the line and column of any syntax error explained in plain words.
更新于 已验证的示例：6
The JSON is valid: 10 values with 6 keys, nested 2 levels deep. Pretty-printing takes it from 127 to 170 bytes.
{
"name": "CalcOpenly",
"version": "1.0.0",
"precision": 50,
"domains": [
"math",
"finance",
"programming"
],
"offline": true,
"license": null
}| Type | Count |
|---|---|
| Objects | 1 |
| Arrays | 1 |
| Strings | 5 |
| Numbers | 1 |
| Booleans | 1 |
| Nulls | 1 |
Valid JSON: 1 objects, 1 arrays, 5 strings, 1 numbers, 1 booleans, 1 nulls.
6 keys in total; the deepest value sits 2 levels down.
One member or item per line, indented 2 spaces per level.
Strings and numbers are copied exactly as written, so escapes and number formats are unchanged.
The validator parses the text with the RFC 8259 grammar: objects, arrays, double-quoted strings, numbers, true, false and null, and nothing else. If parsing succeeds, it prints the same values back, either with one member per line and 2 spaces, 4 spaces or a tab per level, or minified with every space outside strings removed. If it fails, it reports the line and column where the grammar broke and what it expected there.
Developers use it to read API responses and config files and to shrink payloads. The default object has 6 keys and 10 values nested 2 levels deep, and pretty-printing it with 2 spaces grows it from 125 to 168 bytes.
Strings and numbers are copied exactly as written, so escapes survive and a large integer such as 12345678901234567890123 keeps every digit.
核验来源：Python 3.8: json.dumps(json.loads(s), indent=2, ensure_ascii=False); value count by walking json.loads(s)
核验来源：Python 3.8: json.dumps(json.loads(s), separators=(',', ':')); len(s.encode()) = 45, output 33 bytes
核验来源：RFC 8259 §2 (any value may be the top-level text); Python 3.8 json.dumps(json.loads(' 42 '), indent=2) = '42'
核验来源：Python 3.8: json.dumps(json.loads(s), indent=4)
Trailing commas, single quotes and unquoted keys cause most failures, because JSON requires double quotes around every string and key and allows no comma after the last item. Comments, NaN, Infinity and hex numbers are also invalid under RFC 8259, although JavaScript accepts some of them in code. The error message here gives the line and column, so you can go straight to the character that broke the parse.
No. RFC 8259 and ECMA-404 define no comment syntax, so a standard parser rejects // and /* */. Douglas Crockford removed comments from the format early on because people were using them to hold parser directives. Config files that need comments use JSON5 or JSONC, the format of VS Code's settings.json, and this validator reports those files as invalid JSON.
RFC 8259 sets no limit, but it warns that only integers between −(2^53 − 1) and 2^53 − 1 = 9,007,199,254,740,991 are sure to interoperate, since many parsers use IEEE 754 doubles. This tool copies numbers digit for digit, but JavaScript's JSON.parse turns 12345678901234567890123 into 1.2345678901234568e22, so send large IDs as strings.
RFC 8259 says the names within an object SHOULD be unique, so duplicates are legal but unreliable: JavaScript's JSON.parse and Python's json module keep only the last value, while other parsers keep the first or reject the document. This validator accepts them but warns with the line and column of the object, so you can remove the duplicate before another system reads it differently.
Pretty-printing puts each member on its own line with 2 or 4 spaces or a tab per level, which makes the data easy to read and diff; minifying removes every space and line break outside strings for transfer. Both describe exactly the same data. The default example grows from 125 to 168 bytes when pretty-printed, and the minify example shrinks from 45 to 33 bytes.
准确性取决于输入值和方法的假设。十进制运算使用50位有效数字，但估算、数值方法和源数据的精度可能较低；显示时的舍入并不能消除这些限制。 已按独立来源核验的计算示例：6。 例如，“Pretty-print with 2 spaces”根据Python 3.8: json.dumps(json.loads(s), indent=2, ensure_ascii=False); value count by walking json.loads(s)进行核验。
RFC 8259 — The JavaScript Object Notation (JSON) Data Interchange Format; ECMA-404 — The JSON data interchange syntax, 2nd edition.
此计算器包含 6 个已解示例，答案来自独立来源。这些示例会在测试套件中运行，你也可以在此运行验证。
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