validate a string value using joi in javascript

To validate a string value using Joi in JavaScript, you need to define a schema using the Joi.string() method and then use it to validate the string value by calling the schema.validate() method.

Here's an example code:

index.tsx
const Joi = require('joi');

// Define the schema
const schema = Joi.string().required();

// Define the string value to be validated
const value = "hello world";

// Validate the string value
const { error, validatedValue } = schema.validate(value);

// Check if there's an error
if (error) {
  console.error(error);
} else {
  console.log(validatedValue);
}
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In this example, we defined a schema that requires a string value (Joi.string().required()). We then defined a string value to be validated (const value = "hello world";) and validated it using the schema (schema.validate(value);).

The validate() method returns an object with two properties: error and validatedValue. If there's an error during validation, the error property will contain information about the error. If the validation is successful, the validatedValue property will contain the validated string value.

In the example code above, we checked if there's an error (if (error)) and printed it to the console (console.error(error);). If there's no error, we printed the validated value to the console (console.log(validatedValue);).