Concise Encoding (dataNotation, appeared 2018)
Creators: Karl Stenerud
Origin: https://github.com/kstenerud/concise-encoding
Country: Czech Republic and Germany
Website: https://concise-encoding.org

Concise Encoding gives you ease and efficiency with its 1:1 compatible text and binary formats.


GitHub description: The secure data format for a  modern world

c1
{
    "boolean"       = true
    "binary int"    = -0b10001011
    "octal int"     = 0o644
    "decimal int"   = -10000000
    "hex int"       = 0xfffe0001
    "very long int" = 100000000000000000000000000000000000009
    "decimal float" = -14.125
    "hex float"     = 0x5.1ec4p+20
    "very long flt" = 4.957234990634579394723460546348e+100000
    "not-a-number"  = nan
    "infinity"      = inf
    "neg infinity"  = -inf
}
c1
{
    "string" = "Strings support escape sequences: \n \t \+1f415."
    "url"    = @"https://example.com/"
    "email"  = @"mailto:me@somewhere.com"
}
c1
{
    "uuid"      = f1ce4567-e89b-12d3-a456-426655440000
    "date"      = 2019-07-01
    "time"      = 18:04:00.948/Europe/Prague
    "timestamp" = 2010-07-15/13:28:15.415942344
    "null"      = null
    "media"     = |m application/x-sh 23 21 2f 62 69 6e 2f 73 68 0a 0a
                    65 63 68 6f 20 68 65 6c 6c 6f 20 77 6f 72 6c 64 0a|
}
c1
{
    "list"          = [1 2.5 "a string"]
    "map"           = {"one"=1 2="two" "today"=2020-09-10}
    "bytes"         = |u8x 01 ff de ad be ef|
    "int16 array"   = |i16 7374 17466 -9957|
    "uint16 hex"    = |u16x 91fe 443a 9c15|
    "float32 array" = |f32 1.5e10 -8.31e-12|
}
c1
[
    @vehicle<"make"   "model"    "drive" "sunroof">
    @vehicle("Ford"   "Explorer" "4wd"   true     )
    @vehicle("Toyota" "Corolla"  "fwd"   false    )
    @vehicle("Honda"  "Civic"    "fwd"   false    )
]
c1
[
    {
        "make" = "Ford"
        "model" = "Explorer"
        "drive" = "4wd"
        "sunroof" = true
    }
    {
        "make" = "Toyota"
        "model" = "Corolla"
        "drive" = "fwd"
        "sunroof" = false
    }
    {
        "make" = "Honda"
        "model" = "Civic"
        "drive" = "fwd"
        "sunroof" = false
    }
]
c1
//
// The tree:
//
//       2
//      / \
//     5   7
//    /   /|\
//   9   6 1 2
//  /   / \
// 4   8   5
//
(2
    (7
        2
        1
        (6
            5
            8
        )
    )
    (5
        (9
            4
        )
    )
)
c1
//
// The weighted graph:
//
//     b
//    /|\
//   4 1 1
//  /  |  \
// a-3-c-4-d
//
{
    "vertices" = [
        &a:{}
        &b:{}
        &c:{}
        &d:{}
    ]
    "edges" = [
        @($a {"weight"=4 "direction"="both"} $b)
        @($a {"weight"=3 "direction"="both"} $c)
        @($b {"weight"=1 "direction"="both"} $c)
        @($b {"weight"=1 "direction"="both"} $d)
        @($c {"weight"=4 "direction"="both"} $d)
    ]
}
c1
{
    // Entire map will be referenced later as $id1
    "marked object" = &id1:{
        "recursive" = $id1
    }
    "ref1" = $id1
    "ref2" = $id1

    // Reference pointing to part of another document.
    "outside ref" = $"https://xyz.com/document.cte#some_id"
}
c1
{
    // Custom types are user-defined, with user-supplied codecs.
    "custom text"   = |c "cplx(2.94+3i)"|
    "custom binary" = |c 01 f6 28 3c 40 00 00 40 40|
}