Modify data using AJV for Json Schema - jsonschema

Question

I'm using AJV (Another Json schema validator) on NodeJs.
I've the following schema
var schema = {
"$id": "testSchema.json",
"type": "object",
"$schema": "http://json-schema.org/draft-06/schema#",
"additionalProperties": false,
"properties": {
"userId": {
"type": "integer"
},
"userName": {
"type": "string"
},
"uniqueID": {
"type": "integer"
}
}
}
I need to overwrite unqiueID property by a value that I could somehow pass to Json schema or AJV.
I think the above can be done using AJV addKeyword method, tried using it but failed because I don't know how to manipulate (and return) data value from AJV custom keywords.
Is possible to modify data with AJV ? or are there any other possible ways to do it??
Thank you!

Answer 1

You can create a custom keyword with function that will do whatever your want to data.
var Ajv = require('ajv');
var ajv = new Ajv({allErrors: true});
ajv.addKeyword('my_id_rewrite', {
type: 'object',
compile: function (sch, parentSchema) {
return function (data) {
console.log(data)
data['my_id']=parentSchema.my_id_rewrite;
return true;
}
}
});
var schema = { "my_id_rewrite": 2 };
var validate = ajv.compile(schema);
o = {"my_id":1}
console.log(validate(o)); // true
console.log(o); // Object {my_id: 2}
https://runkit.com/embed/cxg0vwqazre3