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authorNevena Bojovic <nenabojov@gmail.com>2022-03-01 22:05:25 +0100
committerNevena Bojovic <nenabojov@gmail.com>2022-03-01 22:05:25 +0100
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-# json-parse-even-better-errors
-
-[`json-parse-even-better-errors`](https://github.com/npm/json-parse-even-better-errors)
-is a Node.js library for getting nicer errors out of `JSON.parse()`,
-including context and position of the parse errors.
-
-It also preserves the newline and indentation styles of the JSON data, by
-putting them in the object or array in the `Symbol.for('indent')` and
-`Symbol.for('newline')` properties.
-
-## Install
-
-`$ npm install --save json-parse-even-better-errors`
-
-## Table of Contents
-
-* [Example](#example)
-* [Features](#features)
-* [Contributing](#contributing)
-* [API](#api)
- * [`parse`](#parse)
-
-### Example
-
-```javascript
-const parseJson = require('json-parse-even-better-errors')
-
-parseJson('"foo"') // returns the string 'foo'
-parseJson('garbage') // more useful error message
-parseJson.noExceptions('garbage') // returns undefined
-```
-
-### Features
-
-* Like JSON.parse, but the errors are better.
-* Strips a leading byte-order-mark that you sometimes get reading files.
-* Has a `noExceptions` method that returns undefined rather than throwing.
-* Attaches the newline character(s) used to the `Symbol.for('newline')`
- property on objects and arrays.
-* Attaches the indentation character(s) used to the `Symbol.for('indent')`
- property on objects and arrays.
-
-## Indentation
-
-To preserve indentation when the file is saved back to disk, use
-`data[Symbol.for('indent')]` as the third argument to `JSON.stringify`, and
-if you want to preserve windows `\r\n` newlines, replace the `\n` chars in
-the string with `data[Symbol.for('newline')]`.
-
-For example:
-
-```js
-const txt = await readFile('./package.json', 'utf8')
-const data = parseJsonEvenBetterErrors(txt)
-const indent = Symbol.for('indent')
-const newline = Symbol.for('newline')
-// .. do some stuff to the data ..
-const string = JSON.stringify(data, null, data[indent]) + '\n'
-const eolFixed = data[newline] === '\n' ? string
- : string.replace(/\n/g, data[newline])
-await writeFile('./package.json', eolFixed)
-```
-
-Indentation is determined by looking at the whitespace between the initial
-`{` and `[` and the character that follows it. If you have lots of weird
-inconsistent indentation, then it won't track that or give you any way to
-preserve it. Whether this is a bug or a feature is debatable ;)
-
-### API
-
-#### <a name="parse"></a> `parse(txt, reviver = null, context = 20)`
-
-Works just like `JSON.parse`, but will include a bit more information when
-an error happens, and attaches a `Symbol.for('indent')` and
-`Symbol.for('newline')` on objects and arrays. This throws a
-`JSONParseError`.
-
-#### <a name="parse"></a> `parse.noExceptions(txt, reviver = null)`
-
-Works just like `JSON.parse`, but will return `undefined` rather than
-throwing an error.
-
-#### <a name="jsonparseerror"></a> `class JSONParseError(er, text, context = 20, caller = null)`
-
-Extends the JavaScript `SyntaxError` class to parse the message and provide
-better metadata.
-
-Pass in the error thrown by the built-in `JSON.parse`, and the text being
-parsed, and it'll parse out the bits needed to be helpful.
-
-`context` defaults to 20.
-
-Set a `caller` function to trim internal implementation details out of the
-stack trace. When calling `parseJson`, this is set to the `parseJson`
-function. If not set, then the constructor defaults to itself, so the
-stack trace will point to the spot where you call `new JSONParseError`.