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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// VARIABLES //
/**
* Detects a JSON string.
*
* Regular expression: `/^\{[\s\S]*\}$|^\[[\s\S]*\]$/`
*
* - `^\{`
*
* - match a `{` literal which is the first character
*
* - `[\s\S]*`
*
* - match any whitespace and non-whitespace characters which occur `0` or more times
*
* - `\}$`
*
* - match a `}` literal which is the last character
*
* - `|`
*
* - alternatively
*
* - `^\[`
*
* - match a `[` literal which is the first character
*
* - `[\s\S]*`
*
* - match any whitespace and non-whitespace characters which occur `0` or more times
*
* - `\]$`
*
* - match a `]` literal which is the last character
*
* Example matching strings:
*
* - `'{}'`
* - `'[]'`
* - `'{adjlkfaj3743.,><\n\t\rdf}'`
* - `'[adjlkfaj3743.,><\n\t\rdf]'`
* - `'{"a":5}'`
*
* @constant
* @type {RegExp}
* @default /^\{[\s\S]*\}$|^\[[\s\S]*\]$/
*/
var re = /^\{[\s\S]*\}$|^\[[\s\S]*\]$/;
// MAIN //
/**
* Tests if a value is a parseable JSON string.
*
* @param {*} value - value to test
* @returns {boolean} boolean indicating if a value is a parseable JSON string
*
* @example
* var v = isJSON( '{"a":5}' );
* // returns true
*
* @example
* var v = isJSON( '{a":5}' );
* // returns false
*/
function isJSON( value ) {
if ( typeof value !== 'string' ) {
return false;
}
if ( !re.test( value ) ) {
return false;
}
try {
JSON.parse( value );
} catch ( err ) { // eslint-disable-line no-unused-vars
return false;
}
return true;
}
// EXPORTS //
module.exports = isJSON;
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