Jsonnet Files

All project JSON files are in a template defined by Jsonnet files. Jsonnet is based on JSON syntax. Valid JSON is also valid Jsonnet. In addition, Jsonnet offers more language constructs, such as conditions, cycles, and variables.


In addition to the standard Jsonnet functions, the following functions are also available:

ConfigId(string configId) string

  • Replaces a configuration human-readable ID with a generated unique ID.
  • In a template, each configuration has a human-readable name, e.g., my-config.
  • When applying a template, a human-readable ID is replaced with a generated unique ID, e.g., 5038695485.
  • As a result, it is possible to create multiple instances of a template.
  • The ConfigId function is primarily used in the template manifest but can be used in any Jsonnet file.

For example, a bucket ID that contains a configuration ID can be composed in this way:

 storage: {
  input: {
   tables: [
    {source: "in.c-keboola-ex-aws-s3-" + ConfigId("config-with-output-mapping") + ".table"},

ConfigRowId(string rowId) string

  • Replaces a configuration row human-readable ID by a generated unique ID.
  • Similar to ConfigId, but for configuration rows.

Input(string inputId) string

  • Returns the value of the user input.
  • If the input is hidden because the showIf condition was evaluated as false:
    • The function returns an empty value for the input type, e.g., 0 for int, false for bool, etc.


  parameters: {
    api: {
      baseUrl: Input("base-url"),

InputIsAvailable(string inputId) string

  • Returns true if the input has been filled in by the user and false if the step has been skipped or showIf = false.

InstanceId() string

  • Returns the ID of the current template instance.
  • E.g., V1StGXR8IZ5jdHi6BAmyT

InstanceIdShort() string

  • Returns the ID of the current template instance shortened to 8 characters.
  • E.g., V1StGXR8

ComponentIsAvailable(string componentId) bool

  • Returns true if the component is available; otherwise, it returns false.

SnowflakeWriterComponentId() string

  • Returns componentId of the Snowflake writer.
    • Returns keboola.wr-db-snowflake for AWS stacks.
    • Returns keboola.wr-snowflake-blob-storage for Azure stacks.

HasProjectBackend(backend string) bool

  • Returns true if the backend is available; otherwise, it returns false.

Next Steps