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					120 lines
				
				2.1 KiB
			
		
		
			
		
	
	
					120 lines
				
				2.1 KiB
			| 
											3 years ago
										 | # parse-json
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|  | 
 | ||
|  | > Parse JSON with more helpful errors
 | ||
|  | 
 | ||
|  | ## Install
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|  | 
 | ||
|  | ``` | ||
|  | $ npm install parse-json | ||
|  | ``` | ||
|  | 
 | ||
|  | ## Usage
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|  | 
 | ||
|  | ```js | ||
|  | const parseJson = require('parse-json'); | ||
|  | 
 | ||
|  | const json = '{\n\t"foo": true,\n}'; | ||
|  | 
 | ||
|  | 
 | ||
|  | JSON.parse(json); | ||
|  | /* | ||
|  | undefined:3 | ||
|  | } | ||
|  | ^ | ||
|  | SyntaxError: Unexpected token } | ||
|  | */ | ||
|  | 
 | ||
|  | 
 | ||
|  | parseJson(json); | ||
|  | /* | ||
|  | JSONError: Unexpected token } in JSON at position 16 while parsing near '{      "foo": true,}' | ||
|  | 
 | ||
|  |   1 | { | ||
|  |   2 |   "foo": true, | ||
|  | > 3 | }
 | ||
|  |     | ^ | ||
|  | */ | ||
|  | 
 | ||
|  | 
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|  | parseJson(json, 'foo.json'); | ||
|  | /* | ||
|  | JSONError: Unexpected token } in JSON at position 16 while parsing near '{      "foo": true,}' in foo.json | ||
|  | 
 | ||
|  |   1 | { | ||
|  |   2 |   "foo": true, | ||
|  | > 3 | }
 | ||
|  |     | ^ | ||
|  | */ | ||
|  | 
 | ||
|  | 
 | ||
|  | // You can also add the filename at a later point | ||
|  | try { | ||
|  | 	parseJson(json); | ||
|  | } catch (error) { | ||
|  | 	if (error instanceof parseJson.JSONError) { | ||
|  | 		error.fileName = 'foo.json'; | ||
|  | 	} | ||
|  | 
 | ||
|  | 	throw error; | ||
|  | } | ||
|  | /* | ||
|  | JSONError: Unexpected token } in JSON at position 16 while parsing near '{      "foo": true,}' in foo.json | ||
|  | 
 | ||
|  |   1 | { | ||
|  |   2 |   "foo": true, | ||
|  | > 3 | }
 | ||
|  |     | ^ | ||
|  | */ | ||
|  | ``` | ||
|  | 
 | ||
|  | ## API
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|  | 
 | ||
|  | ### parseJson(string, reviver?, filename?)
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|  | 
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|  | Throws a `JSONError` when there is a parsing error. | ||
|  | 
 | ||
|  | #### string
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|  | 
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|  | Type: `string` | ||
|  | 
 | ||
|  | #### reviver
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|  | 
 | ||
|  | Type: `Function` | ||
|  | 
 | ||
|  | Prescribes how the value originally produced by parsing is transformed, before being returned. See [`JSON.parse` docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse#Using_the_reviver_parameter | ||
|  | ) for more. | ||
|  | 
 | ||
|  | #### filename
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|  | 
 | ||
|  | Type: `string` | ||
|  | 
 | ||
|  | Filename displayed in the error message. | ||
|  | 
 | ||
|  | ### parseJson.JSONError
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|  | 
 | ||
|  | Exposed for `instanceof` checking. | ||
|  | 
 | ||
|  | #### fileName
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|  | 
 | ||
|  | Type: `string` | ||
|  | 
 | ||
|  | The filename displayed in the error message. | ||
|  | 
 | ||
|  | #### codeFrame
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|  | 
 | ||
|  | Type: `string` | ||
|  | 
 | ||
|  | The printable section of the JSON which produces the error. | ||
|  | 
 | ||
|  | --- | ||
|  | 
 | ||
|  | <div align="center"> | ||
|  | 	<b> | ||
|  | 		<a href="https://tidelift.com/subscription/pkg/npm-parse-json?utm_source=npm-parse-json&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a> | ||
|  | 	</b> | ||
|  | 	<br> | ||
|  | 	<sub> | ||
|  | 		Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies. | ||
|  | 	</sub> | ||
|  | </div> |