jsonslicer
Stream JSON parser with iterator interface
Decision gist · record as of 2026-08-14
Yes, if you need to parse large JSON files or streams and your system has YAJL development headers available. The memory efficiency and speed justify the compilation overhead for that use case. No if you work with small JSON documents, prefer pure-Python solutions, or cannot manage C extension builds—the project is abandoned and may have compatibility issues on newer systems.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires YAJL development library and a C compiler to build the extension module during installation.
- High install friction: the package is written in C and depends on the YAJL library, requiring compilation.
- The project is abandoned (last commit 2022-10-25, 1389 days ago), so build issues on newer systems may not be addressed.
License · maintenance · safety
MIT (permissive) — MIT license is permissive and poses no restrictions on use, modification, or distribution in proprietary or open-source projects.
last release 2022-10-25 (1389 days) · last repo commit 2022-10-25 · 49 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 315,445 downloads/mo, #7,685 on PyPI
Alternatives
Verify before relying
from jsonslicer import JsonSlicer
with open('data.json') as f:
for item in JsonSlicer(f, ('key', None)):
print(item)- Whether YAJL development headers are available on target systems without manual installation
- Compatibility with Python versions beyond 3.11 (classifiers list 3.6–3.11 only)
- Current build status on modern compilers and operating systems given the project's abandonment
What it is and what it does
JsonSlicer is a streaming JSON parser that reads JSON incrementally from a file or stream without loading the entire document into memory. It uses the YAJL C library for performance and provides a Python iterator interface. You specify a path pattern (using tuples of keys, array indices, or None as wildcards) and the parser yields matching objects as complete Python objects.
The package is designed for processing very large JSON files or continuous streams where memory efficiency matters. It supports multiple path modes to return just the objects, map keys alongside objects, or full path information. It has no runtime dependencies beyond the compiled C extension, making it lightweight once installed.
Use it for
- Extract specific fields from multi-gigabyte JSON files without loading them into RAM
- Process streaming JSON APIs or log files line-by-line or chunk-by-chunk
- Iterate over all items in a deeply nested array or map using wildcard paths
- Parse JSON with optional features like comments or trailing garbage via YAJL flags
- Recover map keys alongside values when iterating dictionaries in JSON
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need to parse large JSON files or streams and your system has YAJL development headers available.
The memory efficiency and speed justify the compilation overhead for that use case. No if you work with small JSON documents, prefer pure-Python solutions, or cannot manage C extension builds—the project is abandoned and may have compatibility issues on newer systems.
Install
jsonslicer on PyPI
Before you install
High install friction: the package is written in C and depends on the YAJL library, requiring compilation. The project is abandoned (last commit 2022-10-25, 1389 days ago), so build issues on newer systems may not be addressed.
Requires YAJL development library and a C compiler to build the extension module during installation.
License in practice
MIT license is permissive and poses no restrictions on use, modification, or distribution in proprietary or open-source projects.
Quickstart
from jsonslicer import JsonSlicer
with open('data.json') as f:
for item in JsonSlicer(f, ('key', None)):
print(item)Verify before relying
- Whether YAJL development headers are available on target systems without manual installation
- Compatibility with Python versions beyond 3.11 (classifiers list 3.6–3.11 only)
- Current build status on modern compilers and operating systems given the project's abandonment
Package facts
| License | MIT permissive |
| Python support | Not specified |
| Install friction | High. Source build required |
| Runtime dependencies | None |
| Maintenance | Abandoned 1,389 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 315,445 / month, #7,685 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseProgramming Language :: C++Programming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.6Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9 |
Evidence: jsonslicer-0.1.8.tar.gz
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See also ijson · jiter · iterable-io · magicattr · jsonquerylang · json-tools-rs · streamingjson · partialjson · json-numpy · json-source-map