You could make a view of your nodes then use

Views Datasource

Views Datasource is a set of plugins for Drupal Views for rendering content in a number of shareable, reusable formats based on XML, JSON and XHTML.

For how to use, see the accepted answer to this Views JSON output

You could make a view of your nodes then use

Views Datasource

Views Datasource is a set of plugins for Drupal Views for rendering content in a number of shareable, reusable formats based on XML, JSON and XHTML.

For how to use, see the accepted answer to this Views JSON output

You could make a view of your nodes then use

Views Datasource

Views Datasource is a set of plugins for Drupal Views for rendering content in a number of shareable, reusable formats based on XML, JSON and XHTML.

For how to use, see the accepted answer to this Views JSON output

You could make a view of your nodes then use

Views Datasource

Views Datasource is a set of plugins for Drupal Views for rendering content in a number of shareable, reusable formats based on XML, JSON and XHTML.

For how to use, see the accepted answer to this Views JSON output