slashes

Slashes

Add or remove backslashes (escape or unescape).

Getting Started

import { addSlashes, removeSlashes } from 'slashes';

addSlashes(`foo\nbar`); // "foo\\nbar"
removeSlashes(`foo\\nbar`); // "foo\nbar"

Adding Slashes

By default, addSlashes will escape the following JSON-unsafe characters.

• Backspace (\b)
• Form Feed (\f)
• Newline (\n)
• Carriage Return (\r)
• Horizontal Tab (\t)
• Vertical Tab (\v)
• Null (\0)
• Double Quote (")
• Backslash (\)

const encoded = addSlashes(`\n`); // "\\n"

This default character set is the characters which cannot be included in a JSON string literal.

const jsonString = `{ "value": "${encoded}" }`;

Escape encoding can be customized using the getEscaped option.

The following is the default, equivalent to not setting the getEscaped option.

import { getEscapedJsonUnsafe } from 'slashes';

addSlashes(`\n`, { getEscaped: getEscapedJsonUnsafe }); // "\\n"

Included getEscaped implementations:

• getEscapedJsonUnsafe - (Default) Encode characters which cannot be used between quotes in a JSON string.
• getEscapedAny - Encode ANY character to a single letter (eg. \n) or an ES5 Unicode (eg. \u0100) escape sequence.

Removing Slashes

The removeSlashes function will always remove one layer of slashes.

// Handles letter escapes
removeSlashes(`\\n`); // "\n"
// Handles ES6 Unicode Code Point escapes
removeSlashes('\\u{a}'); // "\n"
// Handles ES5 Unicode escapes
removeSlashes('\u000a'); // "\n"
// Handles hex escapes
removeSlashes('\x0a'); // "\n"
// Handles octal escapes
removeSlashes('\12'); // "\n"
// The slash is removed if the escape sequence is invalid
removeSlashes(`\\a`); // "a"

Although it should generally not be necessary because all escapes are automatically handled, escape decoding can be customized using the getUnescaped option.

The following is the default, equivalent to not setting the getUnescaped option.

import { getUnescapedAny } from 'slashes';

removeSlashes('\\n', { getUnescaped: getUnescapedAny }); // "\n"

The getUnescapedAny implementation is the only one included.