JSON

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20157

JSON JavaScript Object Notation (JSON) JSON

JSON new JSON JSON Math

JavaScript JSON

JSON null JavaScript JavaScript JSON


: 1 NaN Infinity

JSON JavaScript JSON superset U+2028 LINE SEPARATOR U+2029 PARAGRAPH SEPARATOR JSON JavaScript SyntaxError

undefined JSON Babel JSON5 YAML

JavaScript JSON JSON

JSON

JSON ABNF IETF JSON (RFC)

JSON-text = ws value ws
begin-array     = ws %x5B ws  ; [ left square bracket
begin-object    = ws %x7B ws  ; { left curly bracket
end-array       = ws %x5D ws  ; ] right square bracket
end-object      = ws %x7D ws  ; } right curly bracket
name-separator  = ws %x3A ws  ; : colon
value-separator = ws %x2C ws  ; , comma
ws = *(
     %x20 /              ; Space
     %x09 /              ; Horizontal tab
     %x0A /              ; Line feed or New line
     %x0D                ; Carriage return
     )
value = false / null / true / object / array / number / string
false = %x66.61.6c.73.65   ; false
null  = %x6e.75.6c.6c      ; null
true  = %x74.72.75.65      ; true
object = begin-object [ member *( value-separator member ) ]
         end-object
member = string name-separator value
array = begin-array [ value *( value-separator value ) ] end-array
number = [ minus ] int [ frac ] [ exp ]
decimal-point = %x2E       ; .
digit1-9 = %x31-39         ; 1-9
e = %x65 / %x45            ; e E
exp = e [ minus / plus ] 1*DIGIT
frac = decimal-point 1*DIGIT
int = zero / ( digit1-9 *DIGIT )
minus = %x2D               ; -
plus = %x2B                ; +
zero = %x30                ; 0
string = quotation-mark *char quotation-mark
char = unescaped /
    escape (
        %x22 /          ; "    quotation mark  U+0022
        %x5C /          ; \    reverse solidus U+005C
        %x2F /          ; /    solidus         U+002F
        %x62 /          ; b    backspace       U+0008
        %x66 /          ; f    form feed       U+000C
        %x6E /          ; n    line feed       U+000A
        %x72 /          ; r    carriage return U+000D
        %x74 /          ; t    tab             U+0009
        %x75 4HEXDIG )  ; uXXXX                U+XXXX
escape = %x5C              ; \
quotation-mark = %x22      ; "
unescaped = %x20-21 / %x23-5B / %x5D-10FFFF
HEXDIG = DIGIT / %x41-46 / %x61-66   ; 0-9, A-F, or a-f
       ; HEXDIG equivalent to HEXDIG rule in [RFC5234]
DIGIT = %x30-39            ; 0-9
      ; DIGIT equivalent to DIGIT rule in [RFC5234]

JSONNumber JSONString (U+0009) (U+000D) (U+000A) (U+0020)

JSON[Symbol.toStringTag]: [Symbol.toStringTag] "JSON" Object.prototype.toString()

JSON.isRawJSON(): JSON.rawJSON()
JSON.parse(): text JSON
JSON.rawJSON(): JSON JSON JSON JSON JSON JSON
JSON.stringify(): JSON

JSON

json

{
  "browsers": {
    "firefox": {
      "name": "Firefox",
      "pref_url": "about:config",
      "releases": {
        "1": {
          "release_date": "2004-11-09",
          "status": "retired",
          "engine": "Gecko",
          "engine_version": "1.7"
        }
      }
    }
  }
}

JSON.parse() JSON JavaScript

const jsonText = `{
  "browsers": {
    "firefox": {
      "name": "Firefox",
      "pref_url": "about:config",
      "releases": {
        "1": {
          "release_date": "2004-11-09",
          "status": "retired",
          "engine": "Gecko",
          "engine_version": "1.7"
        }
      }
    }
  }
}`;

console.log(JSON.parse(jsonText));

JSON JavaScript JavaScript JSON 12345678901234567890 === 12345678901234567000 JavaScript 12345678901234567890 JSON JavaScript

BigInt

const data = {
  //  BigInt 
  // 
  // 
  gross_gdp: 12345678901234567890n,
};

JSON JSON.stringify replacer toJSON JSON.stringify
JSON.parse("12345678901234567890") 12345678901234568000

JSON 2 1 JSON 1 JSON JSON JSON HTTP

JSON

JavaScript JSON JavaScript

BigInt JSON toJSON JSON.stringify()

// toJSON() 
BigInt.prototype.toJSON = function () {
  return this.toString();
};
const str1 = JSON.stringify(data);

// JSON.stringify() 
const str2 = JSON.stringify(data, (key, value) => {
  if (key === "gross_gdp") {
    return value.toString();
  }
  return value;
});

JSON {"gross_gdp":"12345678901234567890"} JSON

JSON

Python JSON JSON JavaScript JSON.rawJSON() JSON JSON

// toJSON() 
BigInt.prototype.toJSON = function () {
  return JSON.rawJSON(this.toString());
};
const str1 = JSON.stringify(data);

// JSON.stringify() 
const str2 = JSON.stringify(data, (key, value) => {
  if (key === "gross_gdp") {
    return JSON.rawJSON(value.toString());
  }
  return value;
});

JSON.rawJSON JSON JSON {"gross_gdp":12345678901234567890} JSON JavaScript

JavaScript JSON JSON.parse() JSON.parse() context.source

const parsedData = JSON.parse(str, (key, value, context) => {
  if (key === "gross_gdp") {
    // 
    return BigInt(context.source);
  }
  return value;
});
// { gross_gdp: 12345678901234567890n }


ECMAScript 2027 LanguageSpecification # sec-json-object

MDN

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GitHub

JSON