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Exploring endpoints, parameters, and fields

Exploring endpoints, parameters, and fields

Note — Code chunks are shown but not executed at build time (eval = FALSE). The discovery snippets (tce_catalog(), tce_params(), tce_fields()) work offline anywhere and can be run as-is from any network. The query snippets require a Brazilian IP (the TCE-PE API is geo-restricted).

This vignette shows how to discover endpoints and their input/output metadata using the built-in catalog shipped with tceper.

Discover endpoints with tce_catalog()

library(tceper)

tce_catalog()

Filter by keyword:

tce_catalog(search = "licit")

Inspect one endpoint

Pick an endpoint name from tce_catalog(). For instance, LicitacaoUG:

Input parameters

tce_params("LicitacaoUG")

api_name is the exact query name expected by the API.

r_name is the snake_case name you can pass to the R wrapper.

Output fields

tce_fields("LicitacaoUG")

Query using snake_case arguments

Once you know which parameters exist, you can query with snake_case arguments (the package maps them to api_name internally).

tce_bids(anomodalidade = "2025")

Parameter validation

tceper validates query parameters against the endpoint catalog. If you pass a parameter that does not exist for that endpoint, it aborts and shows the allowed parameter list.

# Example (invalid parameter name for this endpoint):
tce_contracts(fog = "510101", verbose = TRUE)

To avoid this, inspect allowed parameters first:

tce_params("Contratos")

Working with cache

Many wrapper functions can cache results in-memory for faster repeated calls.

You can inspect cache state with:

tce_cache_info()

And clear it with:

tce_cache_clear()

When verbose = TRUE, cache hits may print a short message indicating the returned object comes from cache.

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