glom

A declarative object transformer and formatter, for conglomerating nested data.

glom Permissive license Active ★ 2,162 v25.12.0 released 2025-12-29

Install

glom on PyPI

pip

pip install glom

uv

uv add glom

poetry

poetry add glom

Package facts

License	not declared (permissive)
Python support	not specified
Install friction	low — pure-Python wheel
Runtime dependencies	3 — boltons, attrs, face
Maintenance	actively maintained — 227 days since the last release
Last repo commit	2026-07-17
First released	2018-04-18
Popularity	one of the top 1,000 most-downloaded packages on PyPI (30-day window, as of 2026-08-13)
Known vulnerabilities	none known (OSV.dev, checked 2026-08-13)

Evidence: glom-25.12.0-py3-none-any.whl

Development Status :: 5 - Production/StableIntended Audience :: DevelopersLicense :: OSI Approved :: BSD LicenseProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPyTopic :: Software Development :: LibrariesTopic :: Utilities

About glom

from the package's own PyPI description — quoted content, verbatim

glom

Restructuring data, the Python way

Real applications have real data, and real data nests. Objects inside of objects inside of lists of objects.

glom is a new and powerful way to handle real-world data, featuring:

Path-based access for nested data structures
Readable, meaningful error messages
Declarative data transformation, using lightweight, Pythonic specifications
Built-in data exploration and debugging features

All of that and more, available as a [fully-documented][rtd], pure-Python package, tested on Python 3.7-3.14, as well as PyPy3. Installation is as easy as:

  pip install glom

And when you install glom, you also get [the glom command-line interface][cli_rtd], letting you experiment at the console, but never limiting you to shell scripts:

``` Usage: glom [FLAGS] [spec [target]]

Command-line interface to the glom library,...

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AI interpretation — verify before relying

AI-generated interpretation of the package facts above; every digit, version, license, or vulnerability id it cites is grounded in the facts already shown on this page

glom provides declarative, path-based access and transformation of nested data structures with readable error messages and built-in debugging features.

Low friction: pure-Python wheel with three lightweight runtime dependencies (boltons, attrs, face). Active maintenance with recent release (227 days ago) and 2162 GitHub stars signal ongoing support.

Permissive license (BSD) allows commercial and private use with minimal restrictions; no licensing friction for most adoption scenarios.

Usage

pip install glom
from glom import glom
data = {'a': {'b': {'c': 'd'}}}
result = glom(data, 'a.b.c')
print(result)  # 'd'

Verdict: glom is a mature, actively maintained data-access library with permissive licensing, low install friction, and no known vulnerabilities. It is well-suited for projects needing declarative nested-data navigation with strong error reporting.

Needs verification

Whether boltons, attrs, and face dependencies introduce any transitive security or maintenance concerns beyond what the fact sheet captures
Performance characteristics for very large or deeply nested data structures relative to manual access patterns

nested data access pythondata transformation declarativejson path restructuringdeep object navigationdata extraction nested structurespython data glomdeclarative data mapping