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json-parser
Advanced tools
JSON parser to parse JSON object and MAINTAIN comments.
This is a very low level module. For most situations, recommend to use comment-json
instead.
2.x
json-parser@2.x
brings some breaking changes by completely refactoring with Symbol
s
$ npm i json-parser
const {parse} = require('json-parser')
parse(text, reviver? = null, remove_comments? = false)
: object | string | number | boolean | null
string
The string to parse as JSON. See the JSON object for a description of JSON syntax.Function() | null
Default to null
. It acts the same as the second parameter of JSON.parse
. If a function, prescribes how the value originally produced by parsing is transformed, before being returned.boolean = false
If true, the parsed JSON Object won't contain commentsReturns object | string | number | boolean | null
corresponding to the given JSON text.
content
/**
before-all
*/
// before-all
{
// before
/* before */
"foo" /* after-prop:foo */ : // after-comma:foo
1 // after-value:foo
// after-value:foo
, // after-comma:foo
// after-comma: foo
"bar": [ // before
// before
"baz" // after-value:0
// after-value:0
, // after-comma: 0
"quux"
// after-value:1
] // after-value:bar
// after-value:bar
}
// after-all
console.log(parse(content))
And the result will be:
{
// Comments before the JSON object
[Symbol.for('before-all')]: [{
type: 'BlockComment',
value: '\n before-all\n ',
inline: false
}, {
type: 'LineComment',
value: ' before-all',
inline: false
}],
...
[Symbol.for('after-prop:foo')]: [{
type: 'BlockComment',
value: ' after-prop:foo ',
inline: true
}],
// The real value
foo: 1,
bar: [
"baz",
"quux,
// The property of the array
[Symbol.for('after-value:0')]: [{
type: 'LineComment',
value: ' after-value:0',
inline: true
}, ...],
...
]
}
There are SEVEN kinds of symbol properties:
// comment tokens before the JSON object
Symbol.for('before-all')
// comment tokens before any properties/items inside an object/array
Symbol.for('before')
// comment tokens after property key `prop` and before colon(`:`)
Symbol.for(`after-prop:${prop}`)
// comment tokens after the colon(`:`) of property `prop` and before property value
Symbol.for(`after-colon:${prop}`)
// comment tokens after the value of property `prop`/the item of index `prop`
// and before the key-value/item delimiter(`,`)
Symbol.for(`after-value:${prop}`)
// comment tokens after the comma of `prop`-value pair
// and before the next key-value pair/item
Symbol.for(`after-comma:${prop}`)
// comment tokens after the JSON object
Symbol.for('after-all')
And the value of each symbol property is an array of CommentToken
interface CommentToken {
type: 'BlockComment' | 'LineComment'
// The content of the comment, including whitespaces and line breaks
value: string
// If the start location is the same line as the previous token,
// then `inline` is `true`
inline: boolean
}
console.log(parse(content, null, true))
And the result will be:
{
foo: 1,
bar: [
"baz",
"quux"
]
}
const parsed = parse(`
// comment
1
`)
console.log(parsed === 1)
// false
If we parse a JSON of primative type with remove_comments:false
, then the return value of parse()
will be of object type.
The value of parsed
is equivalent to:
const parsed = new Number(1)
parsed[Symbol.for('before-all')] = [{
type: 'LineComment',
value: ' comment',
inline: false
}]
Which is similar for:
Boolean
typeString
typeFor example
const parsed = parse(`
"foo" /* comment */
`)
Which is equivalent to
const parsed = new String('foo')
parsed[Symbol.for('after-all')] = [{
type: 'BlockComment',
value: ' comment ',
inline: true
}]
But there is one exception:
const parsed = parse(`
// comment
null
`)
console.log(parsed === null) // true
MIT
FAQs
JSON parser to parse JSON object and MAINTAIN comments.
We found that json-parser demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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