find-duplicated-property-keys

A package for detecting all duplicated property keys of a JSON string. It can either be used as a standalone tool for validating JSON files or as a submodule for other Node.js projects.

Use as a Standlone Tool

If you like to use find-duplicated-property-keys as a standalone tool, you first have to install it by using the following command:

$ npm install find-duplicated-property-keys

To run this tool you simply need to execute it from the installation directory like this:

$ node_modules/.bin/find-duplicated-property-keys -s <path-to-json-file>

Of course, if you prefer a more comfortable way of running this tool, you can also install it globally by using this command:

$ npm install -g find-duplicated-property-keys

Then you can run find-duplicated-property-keys from any directory by using the following command:

$ find-duplicated-property-keys -s <path-to-json-file>

When running the tool from terminal, it will list all duplicated property keys followed by the number of their occurrence or return a notification to indicate the JSON file does not contain any duplicated property keys. In addition to that, find-duplicated-property-keys will then also return one of the following exit codes:

Use as a Submodule

In case you need to include find-duplicated-property-keys into another project, you first have to add it to your Node.js application by executing the following command while being in the root directory of your project:

$ npm install find-duplicated-property-keys

To validate a JSON string you can run the module as described in the following example:

const findDuplicatedPropertyKeys = require('find-duplicated-property-keys');

const jsonString = '{"name": "Carl", "name": "Carla", "age": 29}';

const result = findDuplicatedPropertyKeys(jsonString);

console.log(result.toString()); // <instance>.name

The returned result will be an array that contains all duplicated property keys. Each of these property keys is represented by an object which has the following attributes:

Moreover, these objects also contain the following functions for illustrating the actual path to the property key:

Note: When using find-duplicated-property-keys as a submodule, you always have to pass a JSON string instead of the file path to a JSON file.