JSON5 – JSON for Humans

JSON isn’t the friendliest to write. Keys need to be quoted, objects and arrays can’t have trailing commas, and comments aren’t allowed — even though none of these are the case with regular JavaScript today.

JSON5 is a proposed extension to JSON that allows these kinds of things. Here’s an example showcasing most of its features:

{
    foo: 'bar',
    while: true,

    this: 'is a \
multi-line string',

    // this is an inline comment
    here: 'is another', // inline comment

    /* this is a block comment
       that continues on another line */

    hex: 0xDEADbeef,
    half: .5,
    delta: +10,
    to: Infinity,   // and beyond!

    finally: 'a trailing comma',
    oh: [
        "we shouldn't forget",
        'arrays can have',
        'trailing commas too',
    ],
}

Note that the JSON5 proposal is in no way official (technically a new MIMEType is required), and – I fear – most likely won’t get that much adoption/traction with things like YAML already floating around…

JSON5 JS Parser →
JSON5 PHP Parser →

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