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# Data representation in JSON format
## Bool {#bool}
Boolean value.
* Type in JSON: `bool`.
* Value example: `true`.
* Sample JSON value: `true`.
## Int8, Int16, Int32, Int64 {#int}
Signed integer types.
* Type in JSON: `number`.
* Value example: `123456`, `-123456`.
* Sample JSON value: `123456`, `-123456`.
## Uint8, Uint16, Uint32, Uint64 {#uint}
Unsigned integer types.
* Type in JSON: `number`.
* Value example: `123456`.
* Sample JSON value: `123456`.
## Float {#float}
Real 4-byte number.
* Type in JSON: `number`.
* Value example: `0.12345679`.
* Sample JSON value: `0.12345679`.
## Double {#double}
Real 8-byte number.
* Type in JSON: `number`.
* Value example: `0.12345678901234568`.
* Sample JSON value: `0.12345678901234568`.
## Decimal {#decimal}
Fixed-precision number. Only Decimal(22, 9) is supported.
* Type in JSON: `string`.
* Value example: `-320.789`.
* Sample JSON value: `"-320.789"`.
## String, Yson {#string}
Binary strings. Encoding algorithm depending on the byte value:
* [0-31] — `\u00XX` (6 characters denoting the Unicode character code).
* [32-126] — as is. These are readable single-byte characters that don't need to be escaped.
* [127-255] — `\u00XX`.
Decoding is a reverse process. Character codes in `\u00XX`, maximum 255.
* Type in JSON: `string`.
* Value example: A sequence of 4 bytes:
* 5 `0x05`: A control character.
* 10 `0x0a`: The `\n` newline character.
* 107 `0x6b`: The `k` character.
* 255 `0xff`: The `ÿ` character in Unicode.
* Sample JSON value: `"\u0005\nk\u00FF"`.
## Utf8, Json, Uuid {#utf}
String types in UTF-8. Such strings are represented in JSON as strings with JSON characters escaped: `\\`, `\"`, `\n`, `\r`, `\t`, `\f`.
* Type in JSON: `string`.
* Value example: C++ code:
```c++
"Escaped characters: "
"\\ \" \f \b \t \r\n"
"Non-escaped characters: "
"/ ' < > & []() ".
```
* Sample JSON value: `"Escaped characters: \\ \" \f \b \t \r\nNon-escaped characters: / ' < > & []() "`.
## Date {#date}
Date. Uint16, unix time days.
* Type in JSON: `string`.
* Value example: `18367`.
* Sample JSON value: `"2020-04-15"`.
## Datetime {#datetime}
Date and time. Uint64, unix time seconds.
* Type in JSON: `string`.
* Value example: `1586966302`.
* Sample JSON value: `"2020-04-15T15:58:22Z"`.
## Timestamp {#timestamp}
Date and time. Uint64, unix time microseconds.
* Type in JSON: `string`.
* Value example: `1586966302504185`.
* Sample JSON value: `"2020-04-15T15:58:22.504185Z"`.
## Interval {#interval}
Time interval. Int64, precision to the microsecond.
* Type in JSON: `number`.
* Value example: `123456`, `-123456`.
* Sample JSON value: `123456`, `-123456`.
### TzDate, TzDateTime, TzTimestamp {#tzdate}
Datetime types with time zone label.
* Type in JSON: `string`.
* Value is represented as string with the date/time value and the time zone label separated by a comma.
* Sample JSON value: `"2023-06-29,Europe/Moscow"`, `""2023-06-29T17:14:11,Europe/Moscow""`, `""2023-06-29T17:15:36.645735,Europe/Moscow""` for TzDate, TzDateTime and TzTimestamp respectively..
## Date32 {#date32}
Date. Int32, unix time days.
* Type in JSON: `string`.
* Value example: `"-8722"`.
* Sample JSON value: `1946-02-14`.
## Datetime64 {#datetime64}
Date and time. Int64, unix time seconds.
* Type in JSON: `string`.
* Value example: `"-753511371"`.
* Sample JSON value: `1946-02-14T19:17:09Z`.
## Timestamp64 {#timestamp64}
Date and time. Int64, unix time microseconds.
* Type in JSON: `string`.
* Value example: `"-753511370765432"`.
* Sample JSON value: `1946-02-14T19:17:09.234568Z`.
## Interval64 {#interval64}
Time interval. Int64, precision to the microsecond.
* Type in JSON: `number`.
* Value example: `"-9223339708799000000"`, `"9223339708799000000"`.
* Sample JSON value: `-9223339708799000000`, `9223339708799000000`.
### TzDate32, TzDateTime64, TzTimestamp64 {#tzdate32}
Datetime types with time zone label.
* Type in JSON: `string`.
* Value is represented as string with the date/time value and the time zone label separated by a comma.
* Sample JSON value: `"1946-02-14,Europe/Moscow"`, `"1946-02-14T19:17:09,Europe/Moscow"`, `"1946-02-14T19:17:09.234568,Europe/Moscow"` for TzDate32, TzDateTime64 и TzTimestamp64 respectively.
## Optional {#optional}
Means that the value can be `null`. If the value is `null`, then in JSON it's also `null`. If the value is not `null`, then the JSON value is expressed as if the type isn't `Optional`.
* Type in JSON is missing.
* Value example: `null`.
* Sample JSON value: `null`.
## List {#list}
List. An ordered set of values of a given type.
* Type in JSON: `array`.
* Value example:
* Type: `List<Int32>`.
* Value: `1, 10, 100`.
* Sample JSON value: `[1,10,100]`.
## Stream {#stream}
Stream. Single-pass iterator by same-type values,
* Type in JSON: `array`.
* Value example:
* Type: `Stream<Int32>`.
* Value: `1, 10, 100`.
* Sample JSON value: `[1,10,100]`.
## Struct {#struct}
Structure. An unordered set of values with the specified names and type.
* Type in JSON: `object`.
* Value example:
* Type: `Struct<'Id':Uint32,'Name':String,'Value':Int32,'Description':Utf8?>`;
* Value: `"Id":1,"Name":"Anna","Value":-100,"Description":null`.
* Sample JSON value: `{"Id":1,"Name":"Anna","Value":-100,"Description":null}`.
## Tuple {#tuple}
Tuple. An ordered set of values of the set types.
* Type in JSON: `array`.
* Value example:
* Type: `Tuple<Int32??,Int64???,String??,Utf8???>`;
* Value: `10,-1,null,"Some string"`.
* Sample JSON value: `[10,-1,null,"Some string"]`.
## Dict {#dict}
Dictionary. An unordered set of key-value pairs. The type is set both for the key and the value. It's written in JSON to an array of arrays including two items.
* Type in JSON: `array`.
* Value example:
* Type: `Dict<Int64,String>`.
* Value: `1:"Value1",2:"Value2"`.
* Sample JSON value: `[[1,"Value1"],[2,"Value2"]]`.
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