JWST requires Python 3.7 or above and a C compiler for dependencies.
Linux and MacOS platforms are tested and supported. Windows is not currently supported.
The easiest way to install the latest
jwst release into a fresh virtualenv or conda environment is
pip install jwst
jwst package can be installed into a virtualenv or conda environment via
We recommend that for each installation you start by creating a fresh
environment that only has Python installed and then install the
jwst package and
its dependencies into that bare environment.
If using conda environments, first make sure you have a recent version of Anaconda
or Miniconda installed.
If desired, you can create multiple environments to allow for switching between different
versions of the
jwst package (e.g. a released version versus the current development version).
In all cases, the installation is generally a 3-step process:
jwstpackage into that environment
Details are given below on how to do this for different types of installations, including tagged releases, DMS builds used in operations, and development versions. Remember that all conda operations must be done from within a bash/zsh shell.
You can install the latest released version via
pip. From a bash/zsh shell:
conda create -n <env_name> python conda activate <env_name> pip install jwst
You can also install a specific version (from
jwst 0.17.0 onward):
conda create -n <env_name> python conda activate <env_name> pip install jwst==1.3.2
Installing specific versions before
jwst 0.17.0 need to be installed from Github:
conda create -n <env_name> python conda activate <env_name> pip install git+https://email@example.com
You can install the latest development version (not as well tested) from the Github master branch:
conda create -n <env_name> python conda activate <env_name> pip install git+https://github.com/spacetelescope/jwst
There may be occasions where an exact copy of an operational DMS build is desired (e.g. for validation testing or debugging operational issues). We package releases for DMS builds via environment snapshots that specify the exact versions of all packages to be installed.
To install a particular DMS build, consult the
Software vs DMS build version map
table shown below to determine the correct jwst tag. For example, to install the
jwst used in DMS build 7.8.2, use jwst tag 1.3.2. The overall
procedure is similar to the 3-step process outlined in the previous section, but the
details of each command vary, due to the use of environment snapshot files that specify
all of the particular packages to install. Also note that different snapshot files are
used for Linux and Mac OS systems.
conda create -n jwstdp-1.3.2 --file https://ssb.stsci.edu/releases/jwstdp/1.3.2/conda_python_stable-deps.txt conda activate jwstdp-1.3.2 pip install -r https://ssb.stsci.edu/releases/jwstdp/1.3.2/reqs_stable-deps.txt
conda create -n jwstdp-1.3.2 --file https://ssb.stsci.edu/releases/jwstdp/1.3.2/conda_python_macos-stable-deps.txt conda activate jwstdp-1.3.2 pip install -r https://ssb.stsci.edu/releases/jwstdp/1.3.2/reqs_macos-stable-deps.txt
Each DMS delivery has its own installation instructions, which may be found in the corresponding release documentation linked from this page: https://github.com/astroconda/astroconda-releases/tree/master/jwstdp The installation procedures may change from time to time, so consulting the documentation page for the specific version in question is the best way to get that version installed.
If you want to be able to work on and test the source code with the
the high-level procedure to do this is to first create a conda environment using
the same procedures outlined above, but then install your personal copy of the
code overtop of the original code in that environment. Again, this should be done
in a separate conda environment from any existing environments that you may have
already installed with released versions of the
As usual, the first two steps are to create and activate an environment:
conda create -n <env_name> python conda activate <env_name>
To install your own copy of the code into that environment, you first need to
fork and clone the
cd <where you want to put the repo> git clone https://github.com/spacetelescope/jwst cd jwst
python setup.py install and
python setup.py develop commands do not work.
Install from your local checked-out copy as an "editable" install:
pip install -e .
If you want to run the unit or regression tests and/or build the docs, you can make sure those dependencies are installed too:
pip install -e ".[test]" pip install -e ".[docs]" pip install -e ".[test,docs]"
Need other useful packages in your development environment?
pip install ipython jupyter matplotlib pylint
CRDS is the system that manages the reference files needed to run the pipeline. Inside the STScI network, the pipeline works with default CRDS setup with no modifications. To run the pipeline outside the STScI network, CRDS must be configured by setting two environment variables:
export CRDS_PATH=$HOME/crds_cache export CRDS_SERVER_URL=https://jwst-crds.stsci.edu
Documentation (built daily from the Github
master branch) is available at:
To build the docs yourself, clone this repository and build the documentation with:
pip install -e ".[docs]" cd docs make html make latexpdf
We welcome contributions and feedback on the project. Please follow the contributing guidelines to submit an issue or a pull request.
We strive to provide a welcoming community to all of our users by abiding with the Code of Conduct.
|jwst tag||DMS build||CRDS_CONTEXT||Date||Notes|
|1.3.2||B7.8.2||0764||2021-09-03||Final release candidate for B7.8.2|
|1.3.1||B7.8.1||0742||2021-08-09||Final release candidate for B7.8.1|
|1.3.0||B7.8.1rc1||0741||2021-08-02||First release candidate for B7.8.1|
|1.2.3||B7.8||0732||2021-06-08||Final release candidate for B7.8|
|1.2.2||B7.8rc3||0732||2021-06-08||Third release candidate for B7.8|
|1.2.1||B7.8rc2||0732||2021-06-07||Second release candidate for B7.8|
|1.2.0||B7.8rc1||0723||2021-05-24||First release candidate for B7.8|
|1.1.0||B7.7.1||0682||2021-02-26||Final release candidate for B7.7.1|
|1.0.0||B7.7.1rc1||0678||2021-02-22||First release candidate for B7.7.1|
|0.18.3||B7.7||0670||2021-01-25||Final release candidate for B7.7|
|0.18.2||B7.7rc3||0668||2021-01-19||Third release candidate for B7.7|
|0.18.1||B7.7rc2||0664||2021-01-08||Second release candidate for B7.7|
|0.18.0||B7.7rc1||0645||2020-12-21||First release candidate for B7.7|
|0.17.1||B7.6||0641||2020-09-15||Final release candidate for B7.6|
|0.17.0||B7.6rc1||0637||2020-08-28||First release candidate for B7.6|
|0.16.2||B7.5||0619||2020-06-10||Same as 0.16.1, but with installation bug fix|
|0.16.1||B7.5||0619||2020-05-19||Final release candidate for B7.5|
|0.16.0||B7.5rc1||0614||2020-05-04||First release candidate for B7.5|
|0.15.1||B7.4.2||0586||2020-03-10||Final release candidate for B7.4.2|
|0.15.0||B7.4.2rc1||0585||2020-02-28||First release candidate for B7.4.2|
|0.14.2||B7.4||0570||2019-11-18||Final release candidate for B7.4|
|0.14.1||B7.4rc2||0568||2019-11-11||Second release candidate for B7.4|
|0.14.0||B7.4rc1||0563||2019-10-25||First release candidate for B7.4|
|0.13.8||B7.3.1||0541||2019-09-05||Patch for Build 7.3 released as Build 7.3.1|
|0.13.7||B7.3||0535||2019-06-21||Final release candidate for Build 7.3|
|0.13.6||B7.3rc4||0534||2019-06-20||Fourth release candidate for Build 7.3|
|0.13.5||B7.3rc3||0534||2019-06-19||Third release candidate for Build 7.3|
|0.13.4||B7.3rc2||0534||2019-06-18||Second release candidate for Build 7.3|
|0.13.3||B7.3rc1||0532||2019-06-04||First release candidate for Build 7.3|
|0.13.2||0500*||2019-05-14||DMS test, no delivery to I&T|
|0.13.1||0500*||2019-03-08||DMS test, no delivery to I&T|
|0.13.0||0500||2019-02-15||DMS test, no delivery to I&T|
|0.12.3||B7.2.1||0500||2019-01-15||DMS Build 7.2.1 patch release|
|0.12.2||B7.2||0495||2018-11-07||Final release candidate for Build 7.2|
|0.12.1||B7.2rc2||0495||2018-11-01||Second release candidate for Build 7.2|
|0.12.0||B7.2rc1||0493*||2018-10-09||First release candidate for Build 7.2|
|0.11.0||0482*||2018-09-10||DMS test, no delivery to I&T|
|0.10.0||0477*||2018-07-31||DMS test, no delivery to I&T|
|0.9.6||B7.1.3||0468||2018-06-08||Final release candidate for Build 7.1.3|
|0.9.5||B7.1.3rc3||0468||2018-06-06||Third release candidate for Build 7.1.3|
|0.9.4||B7.1.3rc2||0463*||2018-05-29||Second release candidate for Build 7.1.3|
|0.9.3||B7.1.3rc1||0457*||2018-05-11||First release candidate for Build 7.1.3|
|0.9.2||0441*||2018-03-28||DMS test, no delivery to I&T|
|0.9.1||0432*||2018-02-16||DMS test, no delivery to I&T|
|0.9.0||B7.1.2||0422||2017-12-22||DMS patch release to I&T 2018-02-15|
|0.8.0||B7.1.1||0422||2017-11-06||DMS patch release to I&T 2018-01-17|
|0.8.0||B7.1||0422||2017-11-06||Final, delivered to I&T 2017-11-17|
|0.7.7||B7.0||0303||2016-12-13||Final, delivered to I&T|
Note: CRDS_CONTEXT values flagged with an asterisk in the above table are estimates (formal CONTEXT deliveries are only provided with final builds).
Unit tests can be run via
pytest. Within the top level of your local
jwst repo checkout:
pip install -e ".[test]" pytest
Need to parallelize your test runs over all available cores?
pip install pytest-xdist pytest -n auto
Latest regression test results can be found here (STScI staff only):
The test builds start at 6pm local Baltimore time Monday through Saturday on
To run the regression tests on your local machine, get the test dependencies and set the environment variable TEST_BIGDATA to our Artifactory server (STSci staff members only):
pip install -e ".[test]" export TEST_BIGDATA=https://bytesalad.stsci.edu/artifactory
To run all the regression tests (except the very slow ones):
pytest --bigdata jwst/regtest
You can control where the test results are written with the
--basetemp=<PATH> arg to
pytest. NOTE that
pytest will wipe this directory clean
for each test session, so make sure it is a scratch area.
If you would like to run a specific test, find its name or ID and use the
pytest --bigdata jwst/regtest -k nirspec
If developers need to update the truth files in our nightly regression tests, there are instructions in the repository wiki.