Upgrading from version 3

This page describes changes that users will need to be aware of to make their code compliant with the changes in PuppetDB 3.0. Most of these changes are observable in released versions of the v4 query API, which has been marked ‘experimental’ since 2.0.0 but is the only API available in 3.0.

Note that this document focuses on API changes only, and only includes changes leading up to the release of 3.0. For a more complete description of the changes listed and changes in versions subsequent to 3.0, see the release notes.

Each change below is marked with the corresponding release version.

Backward-incompatible changes

Changes affecting all endpoints

  • (3.0) The query API has been moved from / to /pdb/query, so http://localhost:8080/v4/facts has become http://localhost:8080/pdb/query/v4/facts.

  • (3.0) The /commands endpoint has been moved to its own API at /pdb/cmd, so http://localhost:8080/v3/commands has become http://localhost:8080/pdb/cmd/v1.

  • (3.0) The version and server-time endpoints have been moved out of the query API and into to a separate metadata API. They are now accessed at /pdb/meta/v1/version and /pdb/meta/v1/server-time.

  • (3.0) All previously dash-separated field names (such as “receive-time”), subquery operators (such as “select-facts”), and query parameters (such as “order-by”) are now underscore-separated. This change does not apply to dash-separated endpoint names such as aggregate-event-counts.

  • (3.0) All endpoints with child rest queries (for example /pdb/query/v4/environments/<env_name>/facts) now return a 404 if the parent data does not exist. In the past, an empty array was returned in this case, but this gave the impression that there was a parent but the particular child data was empty. To improve clarity, missing parent data now returns a 404 “Not Found” status code and a proper JSON error.


  • (3.0) The v4 catalogs endpoint has caused the response of the edges and resources fields to be expanded. For more information, see /pdb/query/v4/catalogs documentation.

  • (3.0) We have renamed the “name” key of the catalogs endpoint to “certname”, for consistency with other endpoints.

  • (3.0) The top-level v4 catalogs endpoint will now only return data about nodes that are active. This provides the same consistency as other non-historical data returns. Endpoints which specify the node explicitly will return results even for deactivated or expired nodes.

  • (2.0.0) The v4 catalogs endpoint does not contain a metadata field or an api_version field. The contents of the v3 data field compose the v4 response body, along with the new fields producer_timestamp, hash, and environment. For more information, see the /pdb/query/v4/catalogs documentation.


  • (2.2.0) The v4 facts endpoint returns proper JSON rather than stringified JSON under the value field in the case of a structured fact.

  • (2.2.0) Queries against fact values must use the appropriate type. Possible types are integer, float, Boolean, string, JSON, and null. Where the v3 API would return the same results for [”>”,”value”,”10”] and [”>”,”value”,10], only the second form will work on v4. The same applies for equality queries on Boolean values.


  • (2.2) The v4 factsets endpoint was added to facilitate the grouping of facts per node. For more information, see the /pdb/query/v4/factsets documentation.

  • (3.0) We added a hash field to the endpoint fields to support a unique identifer for factsets.

  • (3.0) The facts field is now expanded as per our new expansion convention, so the data format has changed. For more information, see the /pdb/query/v4/factsets documentation.

  • (3.0) The /pdb/query/v4/factsets/<node>/facts endpoints will now return results even for deactivated or expired nodes.


  • (3.0) the aggregate-event-counts endpoint is no longer supported on HSQLDB.

  • (3.0) the aggregate-event-counts endpoint now accepts multiple summarize_by parameters and returns an array of maps instead of a map. An additional summarize_by field has also been added to describe the parameter used. For more information, see the aggregate-event-counts documentation.

/metrics/v1 (formerly /v3/metrics)

  • (3.0) The former metrics endpoint has been split off into a separate service, and reversioned at v1. If you are currently accessing mbeans at http://localhost:8080/v3/metrics/mbeans, you will now access them at http://localhost:8080/metrics/v1/mbeans and so on, according to the metrics api documentation.

  • (3.0) PuppetDB’s mbeans (listed at /metrics/v1/mbeans) are no longer prefixed with “com.”

/pdb/cmd/v1 (formerly /v3/commands)

/pdb/meta/v1/version (formerly /v3/version)

  • (3.0) The version endpoint has been split from the query service and mounted at pdb/meta/v1/version.

/pdb/meta/v1/server-time (formerly /v3/server-time)

  • (3.0) The server-time endpoint has been split from the query service and mounted at pdb/meta/v1/server-time.

New API features

New endpoints

Features affecting all endpoints

  • (3.0) Extract is available as a top-level query operator, useful for selecting only certain fields from a response. See the documentation on the extract operator for more information.

  • (2.2.0) The in and extract operators have been changed to accept multiple fields, allowing more concise subquerying as explained here.


  • (3.0) The v4 events endpoint does not require a query parameter, so /pdb/query/v4/events is now a valid query. See the events endpoint documentation for more information.



  • (3.0) The v4 catalogs endpoint is queryable like the other endpoints, whereas before it could only return a catalog for a single host. The old query format (/pdb/query/v4/catalogs/myhost) still works as before, but /pdb/query/v4/catalogs returns results too. For more information, see the catalog query examples.


  • (2.2.0) The new select_fact_contents subquery operator allows for filtering the results of other endpoints based on detailed queries about structured fact values. This is exhibited on the bottom of the subquery examples documentation.

  • (2.2.0) We have added the regexp array match operator ~> for querying fact paths on the fact-contents or fact-paths endpoints. This is documented with the other operators. An example of usage is given at the bottom of the subquery examples page.

  • (3.0) We have added the group_by and function operators, as well as support for the count function. For more information, see the operators documentation.