Nango automatically validates your integration inputs & outputs. It also offers ways to further customize data validation in code. The guide will walk you through each approach.

​
Automatic validation

The validation is available during development and production, and does not require any configuration from you:
  • CLI: Dry Run validation errors are logged and will halt execution when using --validation command option
  • Production: Validation errors are logged but do not halt execution

​
Available schema files

When you use Nango CLI, it automatically generates two schema files in the .nango folder:
  • schema.ts a TypeScript file that contains all your models.
  • schema.json a JSON Schema file that is used for automatic data validation.
These files can be versioned and integrated into your own codebase, ensuring consistency and reliability across different environments.

​
Using zod

You can use zod to validate the data you receive from integrations and push to Nango. 
import * as z from 'zod';

const dataFromAPI = z.object({  
  ticketId: z.string(),
});

export default createSync({
  exec: async (nango) => {
    const response = await nango.get({ endpoint: '/tickets' });
    const isValid = dataFromAPI.parse(response.json);
    if (isValid) {
      [...]
    }
  },
});

​
Using schema.json in your codebase

JSON Schema is supported in most of the main software languages, here is a non-exhaustive list of how you can directly use this file to validate the records you receive from Nango. 
import { Ajv } from 'ajv';
import addFormats from 'ajv-formats';
import jsonSchema from '.nango/schema.json';

// Initiate AJV
const ajv = new Ajv({ allErrors: true, discriminator: true });
addFormats(ajv);

const modelToValidate = 'MyModelName';
const myData = {"id": "hello-word"};

// Compile the JSON schema
const validate = ajv.compile({
  ...jsonSchema,
  ...jsonSchema['definitions'][modelToValidate]
});

// Validate your data
validate(myData);

​
Custom validation

For more advanced use cases, you can generate your own validation schemas using the available files with the tool of your choice.
You can use go-jsonschema golang package. This tool converts JSON Schema definitions into Golang struct. Note that some syntax are not supported by this package.
go-jsonschema -p main .nango/schema.json > test.go