JSON

Parsing JSON is a Minefield
orangeduck/json2c: Convert JSON to C data literals
mikechambers/as3corelib: An ActionScript 3 Library that contains a number of classes and utilities for working with ActionScript? 3. These include classes for MD5 and SHA 1 hashing, Image encoders, and JSON serialization as well as general String, Number and Date APIs.
The Workbench: JSON Compression : Transpose & Binary

Parser

We released simdjson 0.3: the fastest JSON parser in the world is even better! – Daniel Lemire's blog - Simdjson 0.3: Faster JSON parser | Hacker News

JSON path

JSON query and field selection

nemtsov/json-mask: Tiny language and engine for selecting specific parts of a JS object, hiding the rest.
jq (see Tools)
RFC 6901: JavaScript Object Notation (JSON) Pointer - JSON pointer (used by JSON schema)
JSON Path
Queries and Mutations | GraphQL
Facebook (Social) Graph API fields:
- Fields - API Graph
- Field Expansion - API Graph
- ?metadata=1 to get all available fields
- https://graph.facebook.com/me?fields=id,name,albums.limit(5){name,photos.limit(2).after(MTAyMTE1OTQwNDc2MDAxNDkZD){name,picture.width(100).height(100).as(picture_small),picture.width(720).height(720).as(picture_large),tags.limit(2)}},posts.limit(5),adaccounts{campaigns{adsets{ads{insights.time_range({'since':'2020-05-01','until':'2020-05-01'}){adset_id,campaign_id,ad_id,clicks}}}}}
- act_2222222/insights?fields=unique_actions,actions&level=account&time_ranges=[{since:'2020-06-12',until:'2020-06-12'}]
- see Facebook Graph API Explorer
Retrieve selected fields from a search | Elasticsearch Guide [8.6] | Elastic - Elasticsearch fields selection

JSON schema

Media type with schema application/json;schema="http://example.com/my-hyper-schema#. See JSON Schema: A Media Type for Describing JSON Documents It's possible to use Link header with rel parameter instead. See JSON Schema: A Media Type for Describing JSON Documents

There is not inherance, but a validation rule (more like interfaces):

"allOf": [
	{
		"$ref": "#/definitions/some-object"
	},
	{
		"type": "object",
		"properties": {
			"specific-property": {
				"type": "number"
			}
		}
	}
]

Explain why inheritance isn't the right model · Issue #148 · json-schema-org/json-schema-org.github.io

Can be used to edit (with a dedicated UI) JSON and validate again a schema it with:

JSON Editor Online - view, edit and format JSON online

JSON Schema editors and validators:

JSON Schema Validator - Newtonsoft
JSON Schema validation online
korzio/djv: Dynamic JSON Schema Validator - Supports draft-04/06 - RunKit + npm: djv

Ajv - Another JSON Schema Validator - RunKit + npm: ajv

open RunKit + npm: ajv
past the following code in the playground textarea
fill it
then "run" (button below the textarea)
see the result

const Ajv = require('ajv');
const ajv = new Ajv({allErrors: true});
ajv.addMetaSchema(require('ajv/lib/refs/json-schema-draft-06.json'));

function test(data) {
  const valid = validate(data);
  if (valid){
	console.log('Valid!');
  }
  else{
	console.log('Invalid: ' + ajv.errorsText(validate.errors));
  }
}

const schema ={
  /* the content of CEDDL Schema */
};

const digitalData = {
  /* your digitalData here */
};

const validate = ajv.compile(schema);
test(digitalData);

ebdrup/json-schema-benchmark: Benchmarks for Node.js JSON-schema validators

Documentation:

Specification
JSON Schema
Understanding JSON Schema — Understanding JSON Schema 7.0 documentation
JSON Schema Store - List of common JSON Schema
JSON Schema - For JSON Schema Draft 4 and below
jdorn/json-editor: JSON Schema Based Editor

Binary data

Base64, Base92, etc.

// Get list of available chars inside string that use 1 byte (last code point usable in UTF-8 is 0x7F https://en.wikipedia.org/wiki/UTF-8, ASCII 7bits only) and doesn't require JSON encoding
JSON.parse(JSON.stringify(String.fromCharCode(...Array.from({length: 0x7F + 1}, (value, index) => index))).replace(/\\(u[0-9a-z]{4,}|.)/gi, ""))

// Encode integer to include it in JSON string in first UTF-8 byte
function encode(value){
	value = Math.max(value, 0);// only unsigned value
	const charset = " !#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{|}~";
	const radix = charset.length;

	let s = "";
	do {
		s = charset.charAt(value % radix) + s;
		value = Math.floor(value / radix);
	} while(value >= 1)

	return s;
}

function decode (value) {
	// const charset = " !#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{|}~"
	const charset = "!#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{|}~";
	const radix = charset.length;

	let n = 0;
	for(let index = 0, length = value.length; index < length; index++){
		n += charset.indexOf(value.charAt(index)) * radix ** (length - 1 - index);
	}
	return n;
}

Comments

Comment syntax does not exist in JSON (like /* ... */ or // ...). Use a field for that, which could start with $, @, #, //, etc.

You should not use duplicated keys. It's could be supported by parser/writer but it's not standard.

Format used by JSON Schema:

{
	"$comment": "comment line 1\ncomment line 2"
}

Tools

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Last updated 2 months ago