json-source-map
Calculate the source map for a JSON document.
Decision gist · record as of 2026-08-14
Yes, if you need precise source location tracking for JSON values. The package is stable, has zero dependencies, and works on current Python versions. The dormant maintenance status is a minor concern only if you expect future Python compatibility issues; for current use (Python 3.8–3.11), it is reliable and ready to use.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Low install friction with no runtime dependencies.
- Maintenance is dormant—last release was 2022-12-20 and last commit 2024-01-01—but the package is marked Production/Stable and supports current Python versions (3.8–3.11).
License · maintenance · safety
permissive license (permissive) — Licensed under Apache Software License (permissive), allowing free use, modification, and distribution with minimal restrictions.
last release 2022-12-20 (1333 days) · last repo commit 2024-01-01 · 23 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 373,985 downloads/mo, #7,151 on PyPI
Alternatives
Verify before relying
from json_source_map import calculate
result = calculate('{"foo": "bar"}')
print(result) # Maps JSON paths to Entry objects with value_start, value_end, key_start, key_end locations- Whether dormant maintenance status poses a risk for future Python version compatibility or bug fixes.
- Performance characteristics on large JSON documents (memory usage, parsing speed).
What it is and what it does
json-source-map is a Python library that parses JSON and produces a detailed source map: for each value in the document, it records the JSON Pointer path to that value and its precise location in the source text (line, column, and character position for both the key and value). This is useful when you need to report errors or warnings tied to specific parts of a JSON file and want to tell users exactly where to look.
The library handles all JSON types—primitives (strings, numbers, booleans, null) and structures (arrays, objects)—and tracks whitespace correctly. It returns a dictionary mapping JSON Pointer paths to Entry objects, each containing start and end locations with line, column, and character position. No external runtime dependencies are required.
Use it for
- Report validation errors in JSON files with exact line and column numbers for user-friendly error messages.
- Build JSON linters or formatters that need to map diagnostics back to source positions.
- Implement JSON-aware code editors or IDEs that highlight specific values or keys.
- Debug JSON parsing issues by correlating parsed values with their exact source locations.
- Generate source maps for JSON-to-code transpilers or code generators.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need precise source location tracking for JSON values.
The package is stable, has zero dependencies, and works on current Python versions. The dormant maintenance status is a minor concern only if you expect future Python compatibility issues; for current use (Python 3.8–3.11), it is reliable and ready to use.
Install
json-source-map on PyPI
Before you install
Low install friction with no runtime dependencies. Maintenance is dormant—last release was 2022-12-20 and last commit 2024-01-01—but the package is marked Production/Stable and supports current Python versions (3.8–3.11).
License in practice
Licensed under Apache Software License (permissive), allowing free use, modification, and distribution with minimal restrictions.
Quickstart
from json_source_map import calculate
result = calculate('{"foo": "bar"}')
print(result) # Maps JSON paths to Entry objects with value_start, value_end, key_start, key_end locationsVerify before relying
- Whether dormant maintenance status poses a risk for future Python version compatibility or bug fixes.
- Performance characteristics on large JSON documents (memory usage, parsing speed).
Package facts
| License | permissive license permissive |
| Python support | Supports the current Python release >=3.8,<4.0 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Dormant 1,333 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 373,985 / month, #7,151 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableLicense :: OSI Approved :: Apache Software LicenseNatural Language :: EnglishOperating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Topic :: Software Development :: DisassemblersTopic :: Software Development :: DocumentationTopic :: Text ProcessingTopic :: UtilitiesTyping :: Typed |
Evidence: json_source_map-1.0.5-py3-none-any.whl
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See also dirtyjson · jsonpointer · flatten-json · sqlalchemy-json · referencing · jsonmerge · json-spec · jschon · jsonslicer · chompjs