Parse a string as JSON.
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> Parse a string as [JSON][json].
``bash`
npm install @stdlib/utils-parse-json
`javascript`
var parseJSON = require( '@stdlib/utils-parse-json' );
#### parseJSON( str\[, reviver] )
Parses a string as [JSON][json].
`javascript`
var out = parseJSON( '{"beep":"boop"}' );
// returns {'beep':'boop'}
If unable to parse a string as [JSON][json], the function returns an error.
`javascript`
var out = parseJSON( 'beep' );
// returns
To transform the string being parsed, provide a reviver.
`javascript
function reviver( key, value ) {
if ( key === '' ) {
return value;
}
if ( key === 'beep' ) {
return value;
}
}
var str = '{"beep":"boop","a":"b"}';
var out = parseJSON( str, reviver );
// returns {'beep':'boop'}
`
- In contrast to the native [JSON.parse()][json-parse], this implementation throws a TypeError if provided any value which is not a string.
`javascript
var out = JSON.parse( null );
// returns null
out = parseJSON( null );
// throws
`
- In contrast to the native [JSON.parse()][json-parse], this implementation does not throw a SyntaxError if unable to parse a string as [JSON][json].
`javascript
var out = parseJSON( '{"beep":"boop}' );
// returns
out = JSON.parse( '{"beep":"boop}' );
// throws
`
- In contrast to the native [JSON.parse()][json-parse], this implementation throws a TypeError if provided a reviver argument which is not a function.
`javascript
var out = JSON.parse( '{"a":"b"}', [] );
// returns {'a':'b'}
out = parseJSON( '{"a":"b"}', [] );
// throws
`
`javascript
var parseJSON = require( '@stdlib/utils-parse-json' );
var out;
out = parseJSON( '{"beep":"boop"}' );
// returns {'beep':'boop'}
out = parseJSON( '3.14' );
// returns 3.14
out = parseJSON( 'true' );
// returns true
out = parseJSON( 'null' );
// returns null
out = parseJSON( '{"beep":"boop}' );
// returns
`
*
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
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---
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Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/utils-parse-json/tree/deno
[deno-readme]: https://github.com/stdlib-js/utils-parse-json/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/utils-parse-json/tree/umd
[umd-readme]: https://github.com/stdlib-js/utils-parse-json/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/utils-parse-json/tree/esm
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[branches-url]: https://github.com/stdlib-js/utils-parse-json/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/utils-parse-json/main/LICENSE
[json]: http://www.json.org/
[json-parse]: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse