jsonref
v9.0.0
Published
Javascript References ($ref) and Pointers library
Downloads
50,275
Readme
jsonref
A simple Javascript library implementing the JSON Reference and the JSON Pointer specifications.
Install
$ npm install jsonref
parse(dataOrUri [, options])
dataOrUri
, the data to parse or a fully qualified URI to pass toretriever
to download the dataoptions
(optional), parsing options, the following optional properties are supported:scope
, the current resolution scope (base href) of URLs and paths.store
, an object to use to cache resolvedid
and$ref
values. If no store is passed, one is automatically created. Pass astore
if you are going to parse several objects or URIs referencing the sameid
and$ref
values.retriever
, a function accepting a URL in input and returning a promise resolved to an object representing the data downloaded for the URI. Whenever a$ref
to a new URI is found, if the URI is not already cached in the store in use, it'll be fetched using thisretriever
. If notretriever
is passed and a URI needs to be downloaded, ano_retriever
exception is thrown.
The function returns a Promise resolving to the parsed data, with all $ref
instances resolved.
Sample browser-friendly retriever
using fetch
function retriever(url) {
var opts = {
method: 'GET',
credentials: 'include'
};
return fetch(url, opts).then(function(response) {
return response.json();
});
}
Sample node.js retriever
using request
var request = require('request');
function retriever(url) {
return new Promise(function(resolve, reject) {
request({
url: url,
method: 'GET',
json: true
}, function(err, response, data) {
if (err) {
reject(err);
} else if (response.statusCode !== 200) {
reject(response.statusCode);
} else {
resolve(data);
}
});
});
}
pointer(data, path [, value])
data
, the object to transverse using JSON Pointer.path
, either a string (#/prop1/prop2
) or an array of path components ([ "#", "prop1", "prop2" ]
or[ "prop1", "prop2" ]
).value
, optional, value to set atpath
. All missing intermediate path levels are created as well.
Returns the data requested or sets a new value at the specified path
Examples
Parsing an object with no external references
var jsonref = require('jsonref');
var schema = {
"id": "http://my.site/myschema#",
"definitions": {
"schema1": {
"id": "schema1",
"type": "integer"
},
"schema2": {
"type": "array",
"items": { "$ref": "schema1" }
}
}
}
jsonref.parse(schema).then(function(result) {
console.log(JSON.stringify(result, null, 2));
});
The output is:
{
"id": "http://my.site/myschema#",
"definitions": {
"schema1": {
"id": "schema1",
"type": "integer"
},
"schema2": {
"type": "array",
"items": {
"id": "schema1",
"type": "integer"
}
}
}
}
Parsing an object with external references
var jsonref = require('jsonref');
var schema = {
"allOf": [
{ "$ref": "http://json-schema.org/draft-04/schema#" },
{
"type": "object",
"properties": {
"documentation": {
"type": "string"
}
}
}
]
}
jsonref.parse(schema, {
retriever: retriever
}).then(function(result) {
console.log(JSON.stringify(result, null, 2));
});
The library will call retriever("http://json-schema.org/draft-04/schema#")
to download the external
reference. If no retriever
is passed, the returned value is a rejected Promise, with a no_retriever
exception.
Parsing an object using a custom store
var jsonref = require('jsonref');
var store = {};
var schema = {
"id": "http://my.site/myschema#",
"definitions": {
"schema1": {
"id": "schema1",
"type": "integer"
},
"schema2": {
"type": "array",
"items": { "$ref": "schema1" }
}
}
}
jsonref.parse(schema, {
store: store
}).then(function(result) {
console.log(JSON.stringify(result, null, 2));
});
After parsing, the contents of the store are:
{
"http://my.site/myschema#": {
"id": "http://my.site/myschema#",
"definitions": {
"schema1": {
"id": "schema1",
"type": "integer"
},
"schema2": {
"type": "array",
"items": {
"id": "schema1",
"type": "integer"
}
}
}
},
"http://my.site/schema1#": {
"id": "schema1",
"type": "integer"
}
}