mirror of
https://github.com/adambard/learnxinyminutes-docs.git
synced 2024-11-22 21:52:31 +03:00
85 lines
2.7 KiB
Markdown
85 lines
2.7 KiB
Markdown
---
|
|
language: json
|
|
filename: learnjson.json
|
|
contributors:
|
|
- ["Anna Harren", "https://github.com/iirelu"]
|
|
- ["Marco Scannadinari", "https://github.com/marcoms"]
|
|
- ["himanshu", "https://github.com/himanshu81494"]
|
|
- ["Michael Neth", "https://github.com/infernocloud"]
|
|
- ["Athanasios Emmanouilidis", "https://github.com/athanasiosem"]
|
|
---
|
|
|
|
JSON is an extremely simple data-interchange format. As [json.org](https://json.org) says, it is easy for humans to read and write and for machines to parse and generate.
|
|
|
|
A piece of JSON can be any value of the types listed later, but in practice almost always represents either:
|
|
|
|
* A collection of name/value pairs (`{ }`). In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array.
|
|
* An ordered list of values (`[ ]`). In various languages, this is realized as an array, vector, list, or sequence.
|
|
|
|
JSON in its purest form has no actual comments, but most parsers will accept C-style (`//`, `/* */`) comments. Some parsers also tolerate a trailing comma (i.e. a comma after the last element of an array or the after the last property of an object), but they should be avoided for better compatibility.
|
|
|
|
For the purposes of this tutorial, everything is going to be 100% valid JSON. Luckily, it kind of speaks for itself.
|
|
|
|
Supported data types:
|
|
|
|
* Strings: `"hello"`, `"\"A quote.\""`, `"\u0abe"`, `"Newline.\n"`
|
|
* Numbers: `23`, `0.11`, `12e10`, `3.141e-10`, `1.23e+4`
|
|
* Objects: `{ "key": "value" }`
|
|
* Arrays: `["Values"]`
|
|
* Miscellaneous: `true`, `false`, `null`
|
|
|
|
```json
|
|
{
|
|
"key": "value",
|
|
|
|
"keys": "must always be enclosed in double quotes",
|
|
"numbers": 0,
|
|
"strings": "Hellø, wørld. All unicode is allowed, along with \"escaping\".",
|
|
"has bools?": true,
|
|
"nothingness": null,
|
|
|
|
"big number": 1.2e+100,
|
|
|
|
"objects": {
|
|
"comment": "Most of your structure will come from objects.",
|
|
|
|
"array": [0, 1, 2, 3, "Arrays can have anything in them.", 5],
|
|
|
|
"another object": {
|
|
"comment": "These things can be nested, very useful."
|
|
}
|
|
},
|
|
|
|
"silliness": [
|
|
{
|
|
"sources of potassium": ["bananas"]
|
|
},
|
|
[
|
|
[1, 0, 0, 0],
|
|
[0, 1, 0, 0],
|
|
[0, 0, 1, "neo"],
|
|
[0, 0, 0, 1]
|
|
]
|
|
],
|
|
|
|
"alternative style": {
|
|
"comment": "check this out!"
|
|
, "comma position": "doesn't matter, if it's before the next key, it's valid"
|
|
, "another comment": "how nice"
|
|
},
|
|
|
|
|
|
|
|
"whitespace": "Does not matter.",
|
|
|
|
|
|
|
|
"that was short": "And done. You now know everything JSON has to offer."
|
|
}
|
|
```
|
|
|
|
## Further Reading
|
|
|
|
* [JSON.org](https://json.org) All of JSON beautifully explained using flowchart-like graphics.
|
|
* [JSON Tutorial](https://www.youtube.com/watch?v=wI1CWzNtE-M) A concise introduction to JSON.
|