@stdlib/assert-is-json
v0.2.2
Published
Test if a value is a parseable JSON string.
Downloads
687
Readme
isJSON
Test if a value is a parseable JSON string.
Installation
npm install @stdlib/assert-is-json
Usage
var isJSON = require( '@stdlib/assert-is-json' );
isJSON( value )
Tests if a value
is a parseable JSON string
.
var value = '{"a":5}';
var bool = isJSON( value );
// returns true
Notes
The implementation validates that the input
value
is astring
literal. For all other inputs, the method returnsfalse
.The implementation validates that a
string
begins with either[
or{
and ends with a corresponding]
or}
, respectively. Hence, the method will returnfalse
for the followingstrings
, despiteJSON.parse
accepting their input:'<number>'
(e.g.,'5'
)'<boolean>'
(e.g.,'true'
)'null'
The implementation wraps
JSON.parse
inside atry/catch
. Hence, this function cannot be optimized by the compiler during runtime. Nevertheless, using this function is better than embedding atry/catch
within a largerfunction
which could be optimized in the absence of atry/catch
.
Examples
var isJSON = require( '@stdlib/assert-is-json' );
var bool = isJSON( '{"a":5}' );
// returns true
bool = isJSON( '{a":5}' );
// returns false
Notice
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
Community
License
See LICENSE.
Copyright
Copyright © 2016-2024. The Stdlib Authors.