jlens
JSONata for Python, with an engine written in Rust. It filters, queries and transforms JSON documents, and it can explain how a result was reached: which comparisons passed or failed, and which items a filter rejected.
pip install jlens
from jlens import Expression
expr = Expression("$sum(items[type = $kind].(price * qty))")
expr.evaluate({"items": [{"type": "a", "price": 2.5, "qty": 4}]}, {"kind": "a"}) # 10
jlens passes the official JSONata 2.2.2 test suite, and its package is typed. Wheels cover CPython 3.10 and later, and free-threaded Python 3.15 and later, on Linux, macOS and Windows. The package is in beta until jlens 1.0.
API
| Name | Purpose |
|---|---|
Expression(source) |
Compiles an expression; raises a JlensError on syntax errors |
expr.evaluate(input=None, bindings=None, **options) |
Evaluates against Python values, read as the expression reaches them; None when the result is undefined or null |
expr.evaluate_json(text=None, bindings=None, **options) |
The same with JSON text in and out |
Document(value), Document.from_json(text) |
A document converted once, for expr.evaluate_document(document, bindings=None, **options); shareable between threads |
expr.evaluate_with_audit(input=None, bindings=None, *, level, limits, **options) |
Result, audit tree and explanation; errors are reported, not raised |
expr.register_function(name, implementation, signature=None) |
Makes a Python callable available as $name to every evaluation |
Callables in the bindings are host functions too. The options are timeout (seconds),
max_depth, max_string_length, max_array_length, max_result_size, now and seed.
Errors are JlensError exceptions with the JSONata error code, plus position, start,
end, token and value; offsets count code points, like str indexes.
The full guide is the Python chapter of the jlens book.
License
MIT. The code and documentation ported or adapted from JSONata are also under the MIT license;
see LICENSE.
1 maintainer
Metadata
1 maintainer
Release files for jlens 0.19.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| jlens-0.19.0.tar.gz | 439.0 kB | Details |
Built distributions (wheels)
Total release size: 18.7 MB
Release files / jlens-0.19.0.tar.gz
| Download URL | jlens-0.19.0.tar.gz |
|---|---|
| Size | 439.0 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
fa73efb9941caffe06982fe6fb8e141ea62b43ce021631fb1ce15eaaf73802b5
|
|
BLAKE2b-256 checksum How to use checksums |
a0bca44ad7ffddb89c77e62bad597b57cc93ff1953ca404f6dd11f4c852c4bb0
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp315-abi3.abi3t-win_amd64.whl
| Download URL | jlens-0.19.0-cp315-abi3.abi3t-win_amd64.whl |
|---|---|
| Size | 1.2 MB |
| Tags | CPython 3.15 Windows x86-64 abi3 abi3t |
|
SHA-256 checksum How to use checksums |
7368b386b8094a7d205adff190ac20365da87dfd5612ed9a30b18c412b62dcbc
|
|
BLAKE2b-256 checksum How to use checksums |
637da8a62ad07a96ccf6faf6a1d610ddc1361ec692262af0c3e8cb9e1e43f3aa
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp315-abi3.abi3t-musllinux_1_2_x86_64.whl
| Download URL | jlens-0.19.0-cp315-abi3.abi3t-musllinux_1_2_x86_64.whl |
|---|---|
| Size | 1.5 MB |
| Tags | CPython 3.15 Linux musl 1.2+ x86-64 abi3 abi3t |
|
SHA-256 checksum How to use checksums |
0ea71c507fdf2f48860ee460dcfd3073ac9f335e9d03c43c5464a680af41c078
|
|
BLAKE2b-256 checksum How to use checksums |
1c2833a1fdd34761d6455eff200f98df0f40fd847b83ec1f2f2849477323df6d
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp315-abi3.abi3t-musllinux_1_2_aarch64.whl
| Download URL | jlens-0.19.0-cp315-abi3.abi3t-musllinux_1_2_aarch64.whl |
|---|---|
| Size | 1.4 MB |
| Tags | CPython 3.15 Linux musl 1.2+ ARM64 abi3 abi3t |
|
SHA-256 checksum How to use checksums |
0ddb5effc63b92cf608f6f3790e9b452ec1e3888b218b90647efe2048efb0e70
|
|
BLAKE2b-256 checksum How to use checksums |
34a3df6003306802221ad193b7ce64e377d138c21cdd28d35f8c771d286546cc
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp315-abi3.abi3t-manylinux_2_28_x86_64.whl
| Download URL | jlens-0.19.0-cp315-abi3.abi3t-manylinux_2_28_x86_64.whl |
|---|---|
| Size | 1.3 MB |
| Tags | CPython 3.15 Linux glibc 2.28+ x86-64 abi3 abi3t |
|
SHA-256 checksum How to use checksums |
326739b2272a0969f88a5f2f30fac9d55ce9d1d24d5ea9abe354fc2e27ac1272
|
|
BLAKE2b-256 checksum How to use checksums |
fc99d576025cd58a7ea585245edcd1991cff7701cd856672e59df0e7439fb809
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp315-abi3.abi3t-manylinux_2_28_aarch64.whl
| Download URL | jlens-0.19.0-cp315-abi3.abi3t-manylinux_2_28_aarch64.whl |
|---|---|
| Size | 1.3 MB |
| Tags | CPython 3.15 Linux glibc 2.28+ ARM64 abi3 abi3t |
|
SHA-256 checksum How to use checksums |
877f069e03d1bcd086f34118008701ff46d82753b80a495ad15bdc849b6a81dc
|
|
BLAKE2b-256 checksum How to use checksums |
3bc15d1ec9d63ebe17b0dadb9ddd2d1b0dfb37f543964eb1c43457677f943050
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp315-abi3.abi3t-macosx_11_0_arm64.whl
| Download URL | jlens-0.19.0-cp315-abi3.abi3t-macosx_11_0_arm64.whl |
|---|---|
| Size | 1.2 MB |
| Tags | CPython 3.15 abi3 abi3t macOS 11.0+ ARM64 |
|
SHA-256 checksum How to use checksums |
d40eb8f5a85598f0594029cb2e70769ba2f34fe5d75ad5136ca59942ff57e20d
|
|
BLAKE2b-256 checksum How to use checksums |
e5289f5c3dc1ed9fa995595ffee2656d732bf5c83248ff1c7df35bd77296f2a1
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp315-abi3.abi3t-macosx_10_12_x86_64.whl
| Download URL | jlens-0.19.0-cp315-abi3.abi3t-macosx_10_12_x86_64.whl |
|---|---|
| Size | 1.2 MB |
| Tags | CPython 3.15 abi3 abi3t macOS 10.12+ x86-64 |
|
SHA-256 checksum How to use checksums |
d9aeee625bbdb5861073dbcbd9f58d3d5a778de60d5ab7f453196d18c0b37e9b
|
|
BLAKE2b-256 checksum How to use checksums |
85d6efb12d4410e06b4ba43bfc316f1cd48823a7c4798a6ea56a69b122a4969d
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp310-abi3-win_amd64.whl
| Download URL | jlens-0.19.0-cp310-abi3-win_amd64.whl |
|---|---|
| Size | 1.2 MB |
| Tags | CPython 3.10 Windows x86-64 abi3 |
|
SHA-256 checksum How to use checksums |
c3f346e1cbcfce38230d1622dde86cb29a1667184a7e7b622a5bef87db84e2d9
|
|
BLAKE2b-256 checksum How to use checksums |
7e3abcfdb33ec11dc1859c16dd65ffd6e76fcfdc9c2bf6181862522dc40e19eb
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp310-abi3-musllinux_1_2_x86_64.whl
| Download URL | jlens-0.19.0-cp310-abi3-musllinux_1_2_x86_64.whl |
|---|---|
| Size | 1.5 MB |
| Tags | CPython 3.10 Linux musl 1.2+ x86-64 abi3 |
|
SHA-256 checksum How to use checksums |
1db6da33cd330266acaa25e822bc7cc3174a51973d99e96ad958aea3e4815520
|
|
BLAKE2b-256 checksum How to use checksums |
a42fff2ebb525b513a4e6530fed7746d652529149aa105f04117ba1c01a683b8
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp310-abi3-musllinux_1_2_aarch64.whl
| Download URL | jlens-0.19.0-cp310-abi3-musllinux_1_2_aarch64.whl |
|---|---|
| Size | 1.4 MB |
| Tags | CPython 3.10 Linux musl 1.2+ ARM64 abi3 |
|
SHA-256 checksum How to use checksums |
248d90940fbea949cc5a1e0198c4002c243048aa6027bb64dc0c19acb6149c46
|
|
BLAKE2b-256 checksum How to use checksums |
40a7691b9be3f58713b4463b381a9df9d13fdd17865ab3c334ab0f2d84d1a725
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp310-abi3-manylinux_2_28_x86_64.whl
| Download URL | jlens-0.19.0-cp310-abi3-manylinux_2_28_x86_64.whl |
|---|---|
| Size | 1.3 MB |
| Tags | CPython 3.10 Linux glibc 2.28+ x86-64 abi3 |
|
SHA-256 checksum How to use checksums |
24037a160a155ebbb2da21186d8636ed54b0c8f43b33ad7c230c045b5601b671
|
|
BLAKE2b-256 checksum How to use checksums |
c74c4bac4677b972eab8b35a41af73c7750fdb4aa8a62f3b158638a1a15b56e1
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp310-abi3-manylinux_2_28_aarch64.whl
| Download URL | jlens-0.19.0-cp310-abi3-manylinux_2_28_aarch64.whl |
|---|---|
| Size | 1.3 MB |
| Tags | CPython 3.10 Linux glibc 2.28+ ARM64 abi3 |
|
SHA-256 checksum How to use checksums |
e9a153dacc303a29fd60820f4e7e405b5437c40623926c079a4b42f5f8785d35
|
|
BLAKE2b-256 checksum How to use checksums |
aa80f69b3f56d4db90c11290c257d34891187e25fd69b402c0550c0ed1cb643d
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp310-abi3-macosx_11_0_arm64.whl
| Download URL | jlens-0.19.0-cp310-abi3-macosx_11_0_arm64.whl |
|---|---|
| Size | 1.2 MB |
| Tags | CPython 3.10 abi3 macOS 11.0+ ARM64 |
|
SHA-256 checksum How to use checksums |
90186bcf5904b1d4a5872a5d81170781eafc2b44be3de69e3032103679e88349
|
|
BLAKE2b-256 checksum How to use checksums |
3db0044697c5f7d6e577f94ec7275bfc88c30827550685c10b458456036397f8
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency logRelease files / jlens-0.19.0-cp310-abi3-macosx_10_12_x86_64.whl
| Download URL | jlens-0.19.0-cp310-abi3-macosx_10_12_x86_64.whl |
|---|---|
| Size | 1.2 MB |
| Tags | CPython 3.10 abi3 macOS 10.12+ x86-64 |
|
SHA-256 checksum How to use checksums |
59d74b9b98b0e67d81015c6bbf13960c2e7726ac99963290be9b2c01a7e6db96
|
|
BLAKE2b-256 checksum How to use checksums |
b77f8f1b9ad739167da17a3da3933a130d12fc1541a4569e93bfdeb9dca1492c
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 17, 2026.
Transparency log
