usestrix/strix · warning · SpecParseError

Postman collection {collection_uid} came back empty

Error message

Postman collection {collection_uid} came back empty

What it means

SpecParseError raised by fetch_postman_collection when the fetched payload's 'collection' key is missing-but-defaulted and the payload itself is not a usable non-empty dict — i.e. the API answered 200 with a valid JSON object but no collection content. The code uses payload.get('collection', payload), so an empty envelope {} or {'collection': {}} both land here.

Source

Thrown at strix/utils/api_spec.py:289

        raise SpecParseError(f"Unexpected Postman API response shape for {label}")
    return payload


def fetch_postman_collection(collection_uid: str, api_key: str) -> dict[str, Any]:
    """Fetch a collection from the Postman API and return the raw collection dict.

    Uses ``GET /collections/{uid}`` with the ``X-Api-Key`` header. The endpoint
    wraps the collection under a ``collection`` key, unwrapped here so the result
    matches an exported collection file.
    """
    payload = _postman_api_json(
        f"{POSTMAN_API_BASE}/collections/{collection_uid}",
        api_key,
        f"collection {collection_uid}",
    )
    collection = payload.get("collection", payload)
    if not isinstance(collection, dict) or not collection:
        raise SpecParseError(f"Postman collection {collection_uid} came back empty")
    return collection


def fetch_postman_environment(environment_uid: str, api_key: str) -> dict[str, str]:
    """Fetch a Postman environment and return its enabled ``{key: value}`` pairs.

    Disabled values are skipped, matching how Postman resolves an environment at
    request time.
    """
    payload = _postman_api_json(
        f"{POSTMAN_API_BASE}/environments/{environment_uid}",
        api_key,
        f"environment {environment_uid}",
    )
    environment = payload.get("environment", payload)
    values = environment.get("values") if isinstance(environment, dict) else None
    if not isinstance(values, list):
        return {}

View on GitHub (pinned to 8551339130)

Solutions

  1. Open the collection in Postman and confirm it has at least one request and valid info
  2. If it was just created, wait for sync and retry the fetch
  3. Add content or pick the intended non-empty collection UID

Example fix

# before: scanning a placeholder collection
strix --api-spec postman:uid-of-empty-collection

# after: export a real collection with requests
strix --api-spec postman:uid-of-real-collection
Defensive patterns

Strategy: fallback

Validate before calling

collection = payload.get("collection", payload)
if not isinstance(collection, dict) or not collection:
    raise ValueError("empty collection — pick a collection that has requests")

Type guard

def is_nonempty_collection(c) -> bool:
    return isinstance(c, dict) and len(c) > 0 and ("item" in c or "info" in c)

Try / catch

except SpecParseError as e:
    if "came back empty" in str(e):
        list collections, pick a populated one (or wait for sync on a just-created one), retry once

Prevention

When it happens

Trigger: The API returning {'collection': {}} for an empty or corrupted collection; an empty newly-created collection with zero requests and no info; an integration that returns an empty shell object.

Common situations: Scanning a freshly created placeholder collection; Postman sync lag after creating a collection immediately before fetching; collections whose export was stripped.

Related errors

AI-assisted analysis of usestrix/strix@8551339130 (2026-08-15). Data as JSON: /api/errors/77f6ef19bc40f86d. Report an issue: GitHub.