JSON

Validates if a value is a parseable JSON string.

Installation

$ npm install validate.io-json

For use in the browser, use browserify.

Usage

var isJSON = require( 'validate.io-json' );

isJSON( value )

Validates if a value is a parseable JSON string.

var value = '{"a":5}';
 
var bool = isJSON( value );
// returns true

Notes

• validates that the input value is a string literal. For all other inputs, the method returns false.
• validates that a string begins with either [ or { and ends with a corresponding ] or }, respectively. Hence, the method will return false for the following strings, despite JSON.parse accepting their input:
  • '<number>'; e.g., '5'
  • '<boolean>'; e.g., 'true'
  • 'null'
• uses JSON.parse inside a try/catch. Hence, this method cannot be optimized by the compiler during runtime. Nevertheless, using this function is better than embedding a try/catch within a larger function which could be optimized in the absence of a try/catch.

Examples

var isJSON = require( 'validate.io-json' );
 
console.log( isJSON( '{"a":5}' ) );
// returns true
 
console.log( isJSON( '{a":5}' ) );
// returns false

To run the example code from the top-level application directory,

$ node ./examples/index.js

Tests

Unit

Unit tests use the Mocha test framework with Chai assertions. To run the tests, execute the following command in the top-level application directory:

$ make test

All new feature development should have corresponding unit tests to validate correct functionality.

Test Coverage

This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:

$ make test-cov

Istanbul creates a ./reports/coverage directory. To access an HTML version of the report,

$ make view-cov

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License

MIT license.

Copyright

Copyright © 2015. Athan Reines.