Pydantic "hide_input_in_errors" does not hide "input" field when request validation fails on model #10025

progsmile · 2023-08-07T07:38:40Z

progsmile
Aug 7, 2023

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Example Code

Follow reproduce steps within repo:
https://github.com/progsmile/fast-api-pydantic-bug

Description

Pydantic "hide_input_in_errors" does not hide "input" field when request validation fails on model. Expected behaviour: there is no input field in response.

Operating System

Linux

Operating System Details

No response

FastAPI Version

0.101.0

Pydantic Version

2.1.1

Python Version

3.10.12

Additional Context

No response

anton-koltsov-veeva · 2023-08-31T11:35:32Z

anton-koltsov-veeva
Aug 31, 2023

I confirm this happens on:

fastapi==0.101.1
pydantic==2.3.0
pydantic-settings==2.0.3
pydantic_core==2.6.3

0 replies

samuelpedrajas · 2023-12-19T20:13:42Z

samuelpedrajas
Dec 19, 2023

This is relevant: pydantic/pydantic#7461

FastAPI is probably calling either the errors() or json() methods internally, and since these methods have the parameter include_input defaulted to True, the hide_input_in_errors configuration is ignored.

1 reply

progsmile Dec 20, 2023
Author

Thanks! Does new pydantic fixes issue?

YuriiMotov · 2025-06-03T10:39:55Z

YuriiMotov
Jun 3, 2025
Collaborator

This config flag is for printing only and not respected by e.json() and e.errors() in Pydantic.
pydantic/pydantic#7461 (comment)

In comments there has been expressed the idea of using this config value as a default value for include_input in .json() and .errors() methods. It would solve the problem, but it hasn't been implemented on Pydantic's side.

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Pydantic "hide_input_in_errors" does not hide "input" field when request validation fails on model #10025

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progsmile Aug 7, 2023

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Example Code

Description

Operating System

Operating System Details

FastAPI Version

Pydantic Version

Python Version

Additional Context

Replies: 3 comments · 1 reply

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anton-koltsov-veeva Aug 31, 2023

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samuelpedrajas Dec 19, 2023

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progsmile Dec 20, 2023 Author

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YuriiMotov Jun 3, 2025 Collaborator

progsmile
Aug 7, 2023

Replies: 3 comments 1 reply

anton-koltsov-veeva
Aug 31, 2023

samuelpedrajas
Dec 19, 2023

progsmile Dec 20, 2023
Author

YuriiMotov
Jun 3, 2025
Collaborator