Post data to term field through JSONAPI

Question

Trying to create node via JsonAPi. It contains a term field and text field. Managed to post text field without any issues but struggle to post values to term field. Anyone guide me to post values to term fields. format shared below

"data": {
    "type": "node--verification",
    "attributes": {
        "title": "My custom title"

       }
    "relationships": {
        "field_executing_agency": {
            "data":"BRO",
            "target_id": "1324"
        }

    }
}

Answer 1

In JSON:API, taxonomy term fields are handled like other entity reference fields.

Posting the data below will set the entity reference field field_entity_reference_taxonomy_term to an existing taxonomy term.

"data": {
    "type": "node--node-type",
    "attributes": {
        "title": "My custom title"
       }
    "relationships": {
        "field_entity_reference_taxonomy_term": {
            "type":"taxonomy-term-type-machine-name",
            "id": "taxonomy-term-uuid"
        }

    }
}

If you want to create a new taxonomy term and set the value of field_entity_reference_taxonomy_term to that, then you have two steps:

1. POST the new taxonomy term.
2. Update the node to set the value returned from the server when you POSTed the taxonomy term (the server returns the UUID in the response when it creates a new entity/term).

On a standard installation of Drupal, there's a nice UI for automatically creating taxonomy terms on the node edit page, but with decoupled Drupal, you have to build this yourself.