shouldiuse.io

VERDICT

Should I use marshmallow?

marshmallow is an ORM/ODM/framework-agnostic library for converting complex datatypes, such as objects, to and from native Python datatypes. - marshmallow.readthedocs.io

Worth it. If your team writes Python and needs objects converted to and from JSON with validation, this free open-source library is a solid, standard choice. Non-developers and non-Python shops get nothing here, and public evidence is thin — most sources found concern unrelated products sharing the name.

Confidence

Low. Based on 7 public sources. Most 'marshmallow' evidence found concerns unrelated products (a 2025 horror film, a UK insurer, Android 6.0); library-specific evidence is mostly security pages.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support qualityNot disclosed
  • Security posture

Pricing

Free

Open source

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes

Best for

  • Python API teams
  • REST/JSON payload validation
  • Framework-agnostic serialization
  • Flask and Django backends

Not for

  • Non-developers — it's a code library, not software you operate
  • Non-Python stacks (JavaScript, Ruby, Go)
  • Teams wanting a UI, dashboard, or vendor support
  • One-off scripts — plain dicts and json suffice

Gotchas - check before you buy

high

Running 2.x? CVE-2018-17175 is published against it — upgrade before production.

medium

It's a developer library — budget engineering time to implement and maintain.

medium

No vendor support or SLA — you're relying on the community GitHub project.

low

Searches for 'marshmallow reviews' surface a horror film, an insurer, and Android — vet sources carefully.

Pros and cons

Pros

  • Free, open-source, framework- and ORM-agnostic
  • Converts complex objects to and from native Python datatypes
  • Maintains a public security policy on GitHub
  • Ubuntu ships and patches it

Cons

  • Code library only — no UI, hosting, or vendor support
  • Python-only; worthless outside Python codebases
  • Old 2.x versions carry a published CVE
  • No meaningful public user reviews found

Sources & method

Analyzed 9/25/2026 - 7 sources - Actively maintained open-source project with a GitHub security policy; one 2018 CVE and one Ubuntu advisory on record.

official x3review x1security x3
  • CVE-2018-17175, NVD lists this CVE against marshmallow 2.0.0, dated September 2018.
  • Ubuntu USN-8225-1, Ubuntu security notice covering Python marshmallow vulnerabilities; researcher Jared Deckard credited.

Key stats

  • Value for money: 5/5

    Rating

  • Free

    Starting price

  • 7

    Sources

  • Analyzed

  • Value for money: 5/5. Free and open-source, zero license cost
  • Ease of use: 4/5. Long-standing Read the Docs documentation
  • Feature depth: 4/5. Framework-agnostic; handles complex nested datatypes
  • Security posture: 3/5. Security policy exists; one old CVE, Ubuntu-patched
  • Free Price Open-source Python library
  • 1 Published CVEs CVE-2018-17175 (2018), per NVD
  • 1 Ubuntu advisories USN-8225-1, Python marshmallow

Pricing

Open source

Free

  • Full serialization and validation library
  • Community support via GitHub

Security

Actively maintained open-source project with a GitHub security policy; one 2018 CVE and one Ubuntu advisory on record.

  • CVE-2018-17175NVD lists this CVE against marshmallow 2.0.0, dated September 2018.⁶
  • Ubuntu USN-8225-1Ubuntu security notice covering Python marshmallow vulnerabilities; researcher Jared Deckard credited.⁵

What users say

No usable user reviews of the Python library surfaced; every review found concerns unrelated products sharing the name.

Alternatives

Compare marshmallow with each alternative.

  • Pydantic

    Type-safe validation; the FastAPI standard, very popular.

  • cattrs

    Simpler object-to-dict round-tripping with less ceremony.

    marshmallow vs cattrs

  • Python dataclasses + json

    Zero dependencies; enough for simple serialization needs.

Full analysis

Based on 7 public sources. Most 'marshmallow' evidence found concerns unrelated products (a 2025 horror film, a UK insurer, Android 6.0); library-specific evidence is mostly security pages.

Free Python library for turning objects into JSON with validation. Great for Python teams; irrelevant to everyone else.

Methodology

Based on 7 public sources. Most 'marshmallow' evidence found concerns unrelated products (a 2025 horror film, a UK insurer, Android 6.0); library-specific evidence is mostly security pages.

Sources

  1. marshmallow documentationmarshmallow.readthedocs.io
    official
  2. marshmallow security page (Read the Docs)marshmallow.readthedocs.io
    official
  3. marshmallow security policy (GitHub)github.com
    official
  4. Linux Foundation project security insightsinsights.linuxfoundation.org
    security
  5. USN-8225-1: Python marshmallow vulnerabilitiesubuntu.com
    security
  6. NVD CPE entry for marshmallow 2.0.0nvd.nist.gov
    security
  7. G2 seller page (0 reviews)g2.com
    review

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