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ENH: Migrate from ujson to orjson

DependenciesRequired and optional dependencies Required and optional dependencies

IO JSONread_json, to_json, json_normalize read_json, to_json, json_normalize

Needs DiscussionRequires discussion from core team before further action Requires discussion from core team before further action

Status: Open.

#62464 In pandas-dev/pandas;

· rhshadrach opened on Sep 26, 2025

BUG: DataFrame.to_json() does not accurately serialize floats such that they can be deserialized without lost information

Bug

IO JSONread_json, to_json, json_normalize read_json, to_json, json_normalize

Status: Open.

#62072 In pandas-dev/pandas;

· PentageerJoshuaMeetsma opened on Aug 8, 2025

ENH: add option to save json without escaping forward slashes

Enhancement

IO JSONread_json, to_json, json_normalize read_json, to_json, json_normalize

Needs TriageIssue that has not been reviewed by a pandas team member Issue that has not been reviewed by a pandas team member

Status: Open.

#61442 In pandas-dev/pandas;

· ellisbrown opened on May 14, 2025

BUG: DataFrame.dtypes.to_json OverflowError: Maximum recursion level reached

Bug

IO JSONread_json, to_json, json_normalize read_json, to_json, json_normalize

Status: Open.

#61170 In pandas-dev/pandas;

· Aliebc opened on Mar 23, 2025

ENH: Support pd.json_normalize for normalizing only meta fields

Enhancement

IO JSONread_json, to_json, json_normalize read_json, to_json, json_normalize

Needs DiscussionRequires discussion from core team before further action Requires discussion from core team before further action

Status: Open.

#60479 In pandas-dev/pandas;

· Ynjxsjmh opened on Dec 3, 2024

BUG: Challenges with Nested Metadata Extraction Using pandas.json_normalize(

Bug

IO JSONread_json, to_json, json_normalize read_json, to_json, json_normalize

Needs InfoClarification about behavior needed to assess issue Clarification about behavior needed to assess issue

Status: Open.

#60254 In pandas-dev/pandas;

· DavidNaizheZhou opened on Nov 8, 2024

BUG: df.to_json causes low precision in floats

Enhancement

IO JSONread_json, to_json, json_normalize read_json, to_json, json_normalize

Needs DiscussionRequires discussion from core team before further action Requires discussion from core team before further action

Status: Open.

#59313 In pandas-dev/pandas;

· bytelinker opened on Jul 25, 2024

BUG: AttributeError about dateutil.relativedelta when calling pd.read_json(json_data)

Bug

IO JSONread_json, to_json, json_normalize read_json, to_json, json_normalize

Needs TriageIssue that has not been reviewed by a pandas team member Issue that has not been reviewed by a pandas team member

Status: Open.

#59227 In pandas-dev/pandas;

· cspzyy opened on Jul 11, 2024

DEPR: <code>keep_default_dates</code> and <code>convert_dates</code> in <code>read_json</code>

DeprecateFunctionality to remove in pandas Functionality to remove in pandas

Dtype ConversionsUnexpected or buggy dtype conversions Unexpected or buggy dtype conversions

IO JSONread_json, to_json, json_normalize read_json, to_json, json_normalize

Status: Open.

#59161 In pandas-dev/pandas;

· mroeschke opened on Jul 1, 2024

QST:

IO JSONread_json, to_json, json_normalize read_json, to_json, json_normalize

Needs TriageIssue that has not been reviewed by a pandas team member Issue that has not been reviewed by a pandas team member

Usage Question

Status: Open.

#58930 In pandas-dev/pandas;

· phan480 opened on Jun 5, 2024

BUG: pandas.read_json casts float column to int

Arrowpyarrow functionality pyarrow functionality

Bug

Docs

IO JSONread_json, to_json, json_normalize read_json, to_json, json_normalize

Status: Open.

#58866 In pandas-dev/pandas;

· albertvillanova opened on May 30, 2024

BUG: Losing information when handling of <code>NoneType</code>s in <code>pd.json_normalize</code>

Bug

IO JSONread_json, to_json, json_normalize read_json, to_json, json_normalize

Needs TriageIssue that has not been reviewed by a pandas team member Issue that has not been reviewed by a pandas team member

Status: Open.

#58395 In pandas-dev/pandas;

· a-theron opened on Apr 24, 2024