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# parse-json
> Parse JSON with more helpful errors
## Install
```
$ npm install parse-json
```
## Usage
```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 | }
| ^
*/
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
### parseJson(string, reviver?, filename?)
Throws a `JSONError` when there is a parsing error.
#### string
Type: `string`
#### reviver
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
Type: `string`
Filename displayed in the error message.
### parseJson.JSONError
Exposed for `instanceof` checking.
#### fileName
Type: `string`
The filename displayed in the error message.
#### codeFrame
Type: `string`
The printable section of the JSON which produces the error.
---
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