marshmallow VS jsonschema

Compare marshmallow vs jsonschema and see what are their differences.

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marshmallow jsonschema
11 4
6,914 466
0.7% -
8.8 7.8
8 days ago 8 days ago
Python Rust
MIT License MIT License
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.


Posts with mentions or reviews of marshmallow. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-10-25.
  • Help making draggable items for Flask app.
    1 project | /r/flask | 21 Aug 2023
    Somehow get a serializer going for your database models. I used marshmallow and flask-marshmallow
  • Faster time-to-market with API-first
    12 projects | | 25 Oct 2022
    Uses a robust data validation library: validating payloads is a complex business. Your data validation library must handle optional and required properties, string formats like ISO dates and UUIDs (both dates and UUIDs are string types in OpenAPI), and strict vs loose type validation (should a string pass as an integer if it can be casted?). Also, in the case of Python, you need to make sure 1 and 0 don’t pass for True and False when it comes to boolean properties. In my experience, the best data validation libraries in the Python ecosystem are pydantic and marshmallow. From the above-mentioned libraries, flasgger and flask-smorest work with marshmallow.
  • What's best library for swagger + flask?
    6 projects | /r/Python | 25 Sep 2022
    I also came across things like Marsmallow and Blueprints, but don't know what these are, still reading about this as I write.
  • pydantic VS marshmallow - a user suggested alternative
    2 projects | 21 Sep 2022
    Pydantic is a data validation library, marshmallow is a data validation library. None of the other libraries in the list of pydantic alternatives is a data validation library.
  • Yet another object serialization framework!
    2 projects | /r/Python | 5 Sep 2022
    I have been working on a package that is very similar in concept to marshmallow (, but which adds a versioning mechanism to track changes in object structure across time, allowing you to migrate objects between different versions.
  • How to implement conditional model
    1 project | /r/flask | 6 Jul 2022
    Either using meta programming:
  • Should I use SQLAlchemy for a side project?
    2 projects | /r/Python | 15 Jun 2022
    You might be surprised how much I agree - I recently opened an issue there hoping to discuss something like this (still awaiting response).
  • The Pocket Guide To API Request Validation You Wish You Had Earlier
    2 projects | | 6 Jan 2022
  • Project Althaia - looking for performance/accuracy feedback on my shallow fork of marshmallow
    2 projects | /r/Python | 3 Jan 2022
    I created a shallow fork of everyone's favourite marshmallow, to work around some performance issues while dumping data. The performance gain I measured is around 45%, but since it's a bad idea to rely on one's own testing, I was hoping that there are some folks here who use marshmallow in their projects, and who would be willing to try it out. Doubly so if your project has some unit tests in it, to confirm that nothing is broken due to my patches.
  • What's the fastest way to parse JSON to output?
    1 project | /r/flask | 21 Feb 2021
    I was looking at That's a nice library to use to parsing?


Posts with mentions or reviews of jsonschema. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-03-24.
  • web service framework and OpenAPI spec
    2 projects | /r/rust | 24 Mar 2023
    Checkout this crate
  • Show HN: Pg_jsonschema – A Postgres extension for JSON validation
    8 projects | | 21 Jul 2022
    The `jsonschema` crate author here.

    First of all, this is an exciting use case, I didn't even anticipate it when started `jsonschema` (it was my excuse to play with Rust). I am extremely pleased to see such a Postgres extension :)

    At the moment it supports Drafts 4, 6, and 7 + partially supports Draft 2019-09 and 2020-12. It would be really cool if we can collaborate on finishing support for these partially supported drafts! What do you think?

    If you'll have any bug reports on the validation part, feel free to report them to our issue tracker -

    Re: performance - there are a couple of tricks I've been working on, so if anybody is interested in speeding this up, feel free to join here -

    P.S. As for the "Prior Art" section, I think that should be mentioned there, as it is also based on `pgx` and `jsonschema`.

  • Need help: Faster JSON Schema validation in Rust
    1 project | /r/rust | 14 Jun 2022
    I've been working on rewriting my jsonschema crate for a while and now I want to ask for help as I don't have much bandwidth to work on it. Here is a WIP pull request with things I have so far:

What are some alternatives?

When comparing marshmallow and jsonschema you can also consider the following projects:

Fast JSON schema for Python - Fast JSON schema validator for Python.

cattrs - Composable custom class converters for attrs.

lupin is a Python JSON object mapper - Python document object mapper (load python object from JSON and vice-versa)

serpy - ridiculously fast object serialization

WTForms - A flexible forms validation and rendering library for Python.

PyValico - Small python wrapper around

ultrajson - Ultra fast JSON decoder and encoder written in C with Python bindings

RDFLib plugin providing JSON-LD parsing and serialization - JSON-LD parser and serializer plugins for RDFLib

Trafaret - Ultimate transformation library that supports validation, contexts and aiohttp.

cargonauts - A Rust web framework