How to Validate JSON in Nodejs

We can quickly and easily validate our JSON files in Nodejs by calling a free data validation API.

When we make our JSON validation API call, we’ll get a structured response containing multiple lines of useful information about our JSON file — including a succinct report on any errors or warnings present within invalid JSON documents. Here’s a generic API response example in JSON format:

{
  "DocumentIsValid": true,
  "PasswordProtected": true,
  "ErrorCount": 0,
  "WarningCount": 0,
  "ErrorsAndWarnings": [
    {
      "Description": "string",
      "Path": "string",
      "Uri": "string",
      "IsError": true
    }
  ]
}

To authorize our API calls, we’ll just need a free Cloudmersive API key, which will allow us to make a limit of 800 API calls per month with no additional commitments.

We can structure our API call using ready-to-run code examples provided below.

First, let’s install the Client SDK with NPM install:

npm install cloudmersive-convert-api-client --save

Or we can just add this snippet to our package.json:

  "dependencies": {
    "cloudmersive-convert-api-client": "^2.6.3"
  }

Now we can call the JSON validation function. We can load our file path in the inputFile variable:

var CloudmersiveConvertApiClient = require('cloudmersive-convert-api-client');
var defaultClient = CloudmersiveConvertApiClient.ApiClient.instance;

// Configure API key authorization: Apikey
var Apikey = defaultClient.authentications['Apikey'];
Apikey.apiKey = 'YOUR API KEY';



var apiInstance = new CloudmersiveConvertApiClient.ValidateDocumentApi();

var inputFile = Buffer.from(fs.readFileSync("C:\\temp\\inputfile").buffer); // File | Input file to perform the operation on.


var callback = function(error, data, response) {
  if (error) {
    console.error(error);
  } else {
    console.log('API called successfully. Returned data: ' + data);
  }
};
apiInstance.validateDocumentJsonValidation(inputFile, callback);

That’s all there is to it — no more code required! Now we can easily validate our JSON files and get useful information about errors and warnings.