postman2pytest

Read a Postman Collection v2.1 JSON file, write a single pytest module that replays every request and asserts on the response. The collection stays the source of truth; the generated suite is committable code. Re-run the converter when the collection changes.

Full CLI reference, auth scrubbing details, stress testing, CI workflow templates, and limitations live in REFERENCE.md next to this file.

Quick start

1. Install the CLI from PyPI:

   pip install postman2pytest

2. Verify the collection is Postman v2.1. Open the JSON and check "info" → "schema" contains v2.1.0.
3. Run the converter:

   postman2pytest --collection my_api.postman_collection.json --out tests/test_api.py

4. Sanity-check the output (test count matches the collection's request count):

   grep -c '^def test_' tests/test_api.py

5. Set the base URL and any credential env vars the suite reads:

   export BASE_URL=https://api.example.com
   export AUTHORIZATION="Bearer ..."

6. Run the suite:

   pytest tests/test_api.py -v

7. Commit the generated module. Re-run step 3 whenever the collection changes.

Example

A collection with one folder Users (two requests) and a top-level Health check request produces three test functions:

def test_users_get_get_all_users():
def test_users_post_create_user():
def test_get_health_check():

Filtering to a single folder shrinks the output to just the two Users tests:

postman2pytest --collection my_api.postman_collection.json \
    --out /tmp/test_users.py --filter-folder Users

Folder matching is case-insensitive. The generated module is self-contained: imports os, pytest, and requests; nothing else, no conftest.py required.

Common errors

• Schema mismatch: re-export the collection as v2.1 in Postman.
• BASE_URL not set: the generated module reads it from the environment, not the collection's stored host.
• File too large: pass --max-input-mb higher, or split via --filter-folder.

Full error-handling tree + CLI flag reference + auth scrubbing details in REFERENCE.md.

CI

For GitHub Actions / GitLab CI / Jenkins templates and a stress-test workflow on 500-2000 request collections, see REFERENCE.md sections "CI integration" and "Testing at scale".

References

• Bundle: REFERENCE.md (CLI flags, validation, stress testing, error tree, CI templates)
• Project: https://github.com/golikovichev/postman2pytest
• PyPI: https://pypi.org/project/postman2pytest/
• Article: https://dev.to/golikovichev/postman-and-pytest-are-living-in-parallel-universes-heres-a-bridge-5bgn