Library for calibration of science observations from the James Webb Space Telescope

These details have been verified by PyPI

Maintainers

dencheva jhunkeler stsci_maintainer stsci_ssb zacharyburnett

These details have not been verified by PyPI

Project links

Project description

JWST Calibration Pipeline

STScI Logo

[!WARNING] jwst is not yet compatible with python 3.14.

Installation of jwst versions 1.15.1 through 1.16.1 will pull an incompatible version of the gwcs dependency - this can be remedied by downgrading the gwcs version through e.g. pip install 'gwcs<0.22'

Installation on MacOS Mojave 10.14 will fail due to lack of a stable build for dependency opencv-python.

[!IMPORTANT] JWST requires a C compiler for dependencies.

Linux and MacOS platforms are tested and supported. Windows is not currently supported.

Installation

Please contact the JWST Help Desk for installation issues.

The easiest way to install the latest jwst release into a fresh virtualenv or conda environment is

pip install jwst==1.20.0

Detailed Installation

The jwst package can be installed into a virtualenv or conda environment via pip. 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:

Create a conda environment
Activate that environment
Install the desired version of the jwst package 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.

Installing latest releases

You can install the latest released version via pip. From a bash/zsh shell:

conda create -n <env_name> python=3.13
conda activate <env_name>
pip install jwst==1.19.1

If no version tag is specified in the install command, pip will find the latest release compatible with the current environment. This can lead to an unintended jwst version, if the latest release of jwst is not compatible with your environment's python version. Explicitly setting the version in the install command will return an informative error if the latest release is not compatible with your environment.

Installing the development version from Github

You can install the latest development version (not as well tested) from the Github main branch:

conda create -n <env_name> python=3.13
conda activate <env_name>
pip install git+https://github.com/spacetelescope/jwst

Installing a DMS Operational Build

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. You can find the list of available releases at the top-level stasis domain.

Each DMS delivery has its own installation instructions, which may be found in the corresponding release documentation, e.g.: https://ssb.stsci.edu/stasis/releases/jwst/JWSTDP-1.16.1/delivery/README-py312-macos-x86_64.html 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.

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 version of jwst used in DMS build 11.2, use jwst tag 1.17.1. 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 the required package versions to install. Also note that different snapshot files are used for Linux and Mac OS systems.

Linux:

conda env create --file https://ssb.stsci.edu/stasis/releases/jwst/JWSTDP-1.18.1/delivery/latest-py312-linux-x86_64.yml
conda activate JWSTDP-1.18.1-1-py312-linux-x86_64

MacOS arm64:

conda env create --file https://ssb.stsci.edu/stasis/releases/jwst/JWSTDP-1.18.1/delivery/latest-py312-macos-arm64.yml
conda activate JWSTDP-1.18.1-1-py312-macos-arm64

MacOS x86_64:

conda env create --file https://ssb.stsci.edu/stasis/releases/jwst/JWSTDP-1.18.1/delivery/latest-py312-macos-x86_64.yml
conda activate JWSTDP-1.18.1-1-py312-macos-x86_64

Starting with the jwst 1.16.1 release, we updated our release procedures to use stasis. For releases prior to 1.16.1, please instead follow the directions below. The complete list of releases prior to 1.16.1 is available on astroconda-releases.

Linux:

conda create -n jwstdp-1.16.1 --file https://ssb.stsci.edu/releases/jwstdp/1.16.1/conda_python_stable-deps.txt
conda activate jwstdp-1.16.1
pip install -r https://ssb.stsci.edu/releases/jwstdp/1.16.1/reqs_stable-deps.txt

MacOS:

conda create -n jwstdp-1.16.1 --file https://ssb.stsci.edu/releases/jwstdp/1.16.1/conda_python_macos-stable-deps.txt
conda activate jwstdp-1.16.1
pip install -r https://ssb.stsci.edu/releases/jwstdp/1.16.1/reqs_macos-stable-deps.txt

Installing for Developers

If you want to be able to work on and test the source code with the jwst package, 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 jwst package.

As usual, the first two steps are to create and activate an environment:

conda create -n <env_name> python=3.12
conda activate <env_name>

To install your own copy of the code into that environment, you first need to fork and clone the jwst repo:

cd <where you want to put the repo>
git clone https://github.com/<your_github_username>/jwst.git
cd jwst

Note: 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

Calibration References Data System (CRDS) Setup

Note: As of November 10, 2022, the process of deprecating the CRDS PUB Server will start. For details, refer to the CRDS PUB Server Freeze and Deprecation page

CRDS is the system that manages the reference files needed to run the pipeline. For details about CRDS, see the User's Guide

The JWST CRDS server is available at https://jwst-crds.stsci.edu

To run the pipeline inside the STScI network, CRDS must be configured to find the CRDS server by setting the environment variable

export CRDS_SERVER_URL=https://jwst-crds.stsci.edu

This server will be used to determine the appropriate CRDS context for a given pipeline version, and the pipeline will obtain individual reference files within this context from a local shared disk.

To run the pipeline outside the STScI network, CRDS must be configured by setting two environment variables:

export CRDS_PATH=<locally-accessable-path>/crds_cache/jwst_ops
export CRDS_SERVER_URL=https://jwst-crds.stsci.edu

This server will be used to determine the appropriate CRDS context for a given pipeline version, and the pipeline will automatically download individual reference files within this context to the local cache specified by CRDS_PATH.

<locally-accessable-path> can be any the user has permissions to use, such as $HOME. Expect to use upwards of 200GB of disk space to cache the latest couple of contexts.

To use a specific CRDS context other than that automatically associated with a given pipeline version, set the CRDS_CONTEXT environment variable:

export CRDS_CONTEXT=jwst_1179.pmap

Documentation

Software documentation (built daily from the GitHub main branch) is available at:

https://jwst-pipeline.readthedocs.io/en/latest/

To build the docs yourself, clone this repository and build the documentation with:

pip install -e ".[docs]"
cd docs
make html
make latexpdf

For more user-focused documentation on the JWST calibration pipeline, see also the JDox pages at:

https://jwst-docs.stsci.edu/jwst-science-calibration-pipeline

The latest build information is also available on JDox at:

https://jwst-docs.stsci.edu/jwst-science-calibration-pipeline/jwst-operations-pipeline-build-information

Contributions and Feedback

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.

If you have questions or concerns regarding the software, please open an issue at https://github.com/spacetelescope/jwst/issues or contact the JWST Help Desk.

Software vs DMS build version map

The table below provides information on each release of the jwst package and its relationship to software builds used in the STScI JWST DMS operations environment. The Released column gives the date on which the jwst tag was released on PyPi and the Ops Install column gives the date on which the build incorporating that release was installed in DMS operations. Note that the CRDS_CONTEXT listed is a minimum context that can be used with that release. A release should work with any contexts between the specified context and less than the context for the next release.

jwst tag	DMS build	SDP_VER	CRDS_CONTEXT	Released	Ops Install	Notes
1.20.2	B12.1.1	2025.4.1	1464	2025-10-31		Patch release for B12.1.1
1.20.1	B12.1	2025.4.0	1464	2025-10-20		Patch release for B12.1
1.20.0	B12.1	2025.4.0	1462	2025-10-15		First release candidate for B12.1
1.19.2	B12.0.2	2025.3.0	1408	2025-09-11	2025-10-06	Patch release for B12.0.2
1.19.1	B12.0.1	2025.3.0	1408	2025-07-21	2025-08-26	Patch release for B12.0.1
1.19.0	B12.0	2025.3.0	1408	2025-06-26		First release candidate for B12.0
1.18.1	B11.3.1	2025.2.1	1364	2025-06-10		Patch release for B11.3.1
1.18.0	B11.3	2025.2.0	1364	2025-04-01	2025-05-20	First release for B11.3
1.17.1	B11.2	2025.1.0	1321	2025-01-02	2025-03-05	Final release candidate for B11.2
1.17.0	B11.2	2025.1.0	1321	2024-12-20	TBD	First release candidate for B11.2
1.16.1	B11.1.1	2024.3.1	1303	2024-11-13	2024-12-06	Final release candidate for B11.1
1.16.0	B11.1	2024.3.0	1298	2024-09-20		First release candidate for B11.1
1.15.1	B11.0	2024.2.2	1293	2024-07-08	2024-09-12	Final release candidate for B11.0
1.15.0	B11.0rc1		1274	2024-06-26		First release candidate for B11.0
1.14.1			1240	2024-06-27		PyPI-only release for external users
1.14.0	B10.2.1	2024.1.1	1240	2024-03-29	2024-06-12	Final release candidate for B10.2.1
1.13.4			1210	2024-01-25		PyPI-only release for external users
1.13.3	B10.1	2023.4.0	1181	2024-01-05		Final release candidate for B10.1
1.13.2	B10.1rc3	2023.4.0	1181	2023-12-21		Third release candidate for B10.1
1.13.1	B10.1rc2	2023.4.0	1181	2023-12-19		Second release candidate for B10.1
1.13.0	B10.1rc1	2023.4.0	1179	2023-12-15		First release candidate for B10.1
1.12.5	B10.0.1	2023.3.1	1166	2023-10-19	2023-12-05	Patch release B10.0.1
1.12.4				2023-10-12		Pinning dependencies for external users
1.12.3	B10.0	2023.3.0	1135	2023-10-03	2023-12-05	Final release candidate for B10.0
1.12.2	B10.0rc3		1135	2023-10-02		Third release candidate for B10.0
1.12.1	B10.0rc2		1132	2023-09-26		Second release candidate for B10.0
1.12.0	B10.0rc1		1130	2023-09-18		First release candidate for B10.0
1.11.4	B9.3.1	2023.2.1	1107	2023-08-14	2023-08-24	Final release for B9.3.1 patch
1.11.3	B9.3	2023.2.0	1097	2023-07-17		Final release candidate for B9.3
1.11.2	B9.3rc3		1097	2023-07-12		Third release candidate for B9.3
1.11.1	B9.3rc2		1094	2023-06-29		Second release candidate for B9.3
1.11.0	B9.3rc1		1094	2023-06-21		First release candidate for B9.3
1.10.2			1077	2023-04-14		Pinning dependencies for external users
1.10.1	B9.2.x	2023.1.1	1077	2023-04-13	2023-05-23	Final release candidate for B9.2
1.10.0	B9.2rc1		1075	2023-03-31		First release candidate for B9.2
1.9.6	B9.1.2	2022.5.2	1068	2023-03-09	2023-03-15	Final release candidate for B9.1.2
1.9.5			1061	2023-03-02		First release candidate for B9.1.2
1.9.4	B9.1.1	2022.5.1	1041	2023-01-27	2023-02-28	Final release candidate for B9.1.1
1.9.3	B9.1	2022.5.0	1030	2023-01-12	2023-02-28	Final release candidate for B9.1
1.9.2	B9.1rc2			2023-01-04		Second release candidate for B9.1 (hotfix)
1.9.1	B9.1rc2			2023-01-03		Second release candidate for B9.1
1.9.0	B9.1rc1			2022-12-27		First release candidate for B9.1
1.8.5	B9.0		1019	2022-12-12		Documentation patch release for B9.0
1.8.4	B9.0			2022-11-16		Documentation patch release for B9.0
1.8.3	B9.0			2022-11-11		Documentation patch release for B9.0
1.8.2	B9.0	2022.4.0	1017	2022-10-19	2022-11-17	Final release candidate for B9.0
1.8.1	B9.0rc2			2022-10-17		Second release candidate for B9.0
1.8.0	B9.0rc1			2022-10-10		First release candidate for B9.0
1.7.2	B8.1.2	2022.3.1	0984	2022-09-12	2022-09-21	Final release candidate for B8.1.2
1.7.1	B8.1.2rc2			2022-09-07		Second release candidate for B8.1.2
1.7.0	B8.1.2rc1			2022-09-01		First release candidate for B8.1.2
1.6.2	B8.1	2022.3.0	0953	2022-07-19	2022-08-19	Final release candidate for B8.1
1.6.1	B8.1rc2			2022-07-15		Second release candidate for B8.1
1.6.0	B8.1rc1			2022-07-11		First release candidate for B8.1
1.5.3	B8.0.1	2022.2.1	0913	2022-06-20	2022-06-30	Patch release B8.0.1
1.5.2	B8.0	2022.2.0	0874	2022-05-20	2022-06-16	Final release candidate for B8.0
1.5.1	B8.0rc2			2022-05-17		Second release candidate for B8.0
1.5.0	B8.0rc1			2022-05-05		First release candidate for B8.0
1.4.6	B7.9.3	2022.1.2	0800	2022-03-25		Final release candidate for B7.9.3
1.4.5	B7.9.3rc2			2022-03-23		Second release candidate for B7.9.3
1.4.4	B7.9.3rc1			2022-03-16		First release candidate for B7.9.3
1.4.3	B7.9.1	2022.1.1	0800	2022-02-03		Final B7.9.1
1.4.2	B7.9	2022.1.0	0797	2022-01-20		Final release candidate for B7.9
1.4.1	B7.9rc2			2022-01-15		Second release candidate for B7.9
1.4.0	B7.9rc1			2022-01-10		First release candidate for B7.9
Pre-launch releases
1.3.3	B7.8.2	2021.4.0	0764	2021-10-05		Same as 1.3.2, but with installation bug fix
1.3.2	B7.8.2	2021.4.0	0764	2021-09-03		Final release candidate for B7.8.2
1.3.1	B7.8.1	2021.3.0	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	2021.2.0	0732	2021-06-08		Final release candidate for B7.8
1.2.2	B7.8rc3			2021-06-08		Third release candidate for B7.8
1.2.1	B7.8rc2			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	2021.1.0	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	2020.4.0	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	2020.3.0	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	2020.2.0	0619	2020-06-10		Same as 0.16.1, but with installation bug fix
0.16.1	B7.5	2020.2.0	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	2020.1.0	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	2019.3.0	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	2019.2.0	0541	2019-09-05		Patch for Build 7.3 released as Build 7.3.1
0.13.7	B7.3	2019.1.0	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	2018_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	2018_1	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	2017_1	0422	2017-11-06		Final release for Build 7.1
0.7.7	B7.0	2016_2	0303	2016-12-13		Final release for Build 7.0

Unit Tests

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

Regression Tests

Latest regression test results can be found here (STScI staff only):

https://github.com/spacetelescope/RegressionTests/actions/workflows/jwst.yml?query=event%3Aschedule

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 -k option:

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.

https://github.com/spacetelescope/jwst/wiki/Maintaining-Regression-Tests

Project details

These details have been verified by PyPI

Maintainers

dencheva jhunkeler stsci_maintainer stsci_ssb zacharyburnett

These details have not been verified by PyPI

Project links

Release history Release notifications | RSS feed

This version

1.20.2

Nov 3, 2025

1.20.1

Oct 20, 2025

1.20.0

Oct 15, 2025

1.20.0rc2 pre-release

Oct 15, 2025

1.19.2

Sep 11, 2025

1.19.1

Jul 21, 2025

1.19.0

Jul 14, 2025

1.18.1

Jun 10, 2025

1.18.0

Apr 8, 2025

1.17.1

Jan 3, 2025

1.17.0

Dec 21, 2024

1.16.1

Nov 13, 2024

1.16.0

Sep 20, 2024

1.15.1

Jul 8, 2024

1.15.0

Jun 26, 2024

1.14.1

Jun 27, 2024

1.14.0

Mar 29, 2024

1.13.4

Jan 25, 2024

1.12.5

Oct 19, 2023

1.12.4

Oct 13, 2023

1.12.3

Oct 3, 2023

1.12.2

Oct 2, 2023

1.12.1

Sep 26, 2023

1.12.0

Sep 18, 2023

1.11.4

Aug 14, 2023

1.11.3

Jul 17, 2023

1.11.2

Jul 12, 2023

1.11.1

Jun 30, 2023

1.11.0

Jun 21, 2023

1.10.2

Apr 14, 2023

1.10.1

Apr 13, 2023

1.10.0

Apr 3, 2023

1.9.6

Mar 9, 2023

1.9.5

Mar 2, 2023

1.9.4

Jan 27, 2023

1.9.3

Jan 12, 2023

1.9.2

Jan 4, 2023

1.9.1

Jan 3, 2023

1.9.0

Dec 27, 2022

1.8.5

Dec 12, 2022

1.8.4

Nov 16, 2022

1.8.3

Nov 11, 2022

1.8.2

Oct 20, 2022

1.8.1

Oct 17, 2022

1.8.0

Oct 10, 2022

1.7.2

Sep 12, 2022

1.7.1

Sep 8, 2022

1.7.0

Sep 1, 2022

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