ultrajson VS PyLD

Compare ultrajson vs PyLD and see what are their differences.


Ultra fast JSON decoder and encoder written in C with Python bindings (by ultrajson)


JSON-LD processor written in Python (by digitalbazaar)
Our great sponsors
  • Nanos - Run Linux Software Faster and Safer than Linux with Unikernels
  • Scout APM - A developer's best friend. Try free for 14-days
  • SaaSHub - Software Alternatives and Reviews
ultrajson PyLD
0 11
3,485 457
1.6% 2.2%
7.6 0.0
8 days ago 6 months ago
C Python
GNU General Public License v3.0 or later BSD 1-Clause 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 ultrajson. We have used some of these posts to build our list of alternatives and similar projects.

We haven't tracked posts mentioning ultrajson yet.
Tracking mentions began in Dec 2020.


Posts with mentions or reviews of PyLD. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-10-29.
  • What is Structured Data?
    2 projects | dev.to | 29 Oct 2021
    Web pages are an interesting example of both structured and unstructured data. There are specific elements one could look at for certain information like the element or other semantic elements like or . The problem though is that these elements are more like our "address" example earlier - they often contain more than just the strict data we are looking for. A title might have a prefix or suffix of the website's name. An article or section might have many other layers of
    , or any other elements to help form the site's structure. To top it off, the HTML structure can vary wildly from site to site. If you were wanting to extract data from multiple websites, it can get very hard very fast.

    That said, there are a number of ways to embed structured data into web pages. A web page could use Microdata, RDFa, JSON-LD or Open Graph to express structured data. More than that though, a web page can use multiple of these at the same time. Open Graph is commonly used as a method of defining details for a link preview while the others might express more complex data like product pricing or reviews.

    Having standard formats like Microdata or JSON-LD are a good start but only represent the format of the data - we need a common vocabulary so we can understand the data those formats encode. One common vocabulary used is called Schema.org and provides over 700 types including types to describe people, places, products, recipes, reviews, vehicles, movies and medical devices. Using Schema.org for structured data on a website can help search engines provide richer experiences in the search results.


    Structured data, through standardising expected properties and value formats, makes the sharing and processing of data easier. Web pages in particular benefit from encoding structured data in their mark-up where it can be used by search engines and other tools.

  • Json-ld spices up the staticness of static site generator
    4 projects | dev.to | 27 Oct 2021
    Json-ld is a linked data format based on json. If you have never heard of json-ld, that's ok. The most important thing to know is that it's just plain old json with a few extra special fields. It's also a w3c standard and you can check out the complete spec. We don't really need to understand the whole spec, we're just interested in the way json-ld can reference other data fragments with a url using the keyword "@id "
  • Schema.org json-ld static site generator
    2 projects | dev.to | 10 Oct 2021
    Sambal natively supports schema.org json-ld as the content model so you can render webpage directly from any schema.org json-ld data. By using the open and well known schema.org vocabularies to structure your content from day one, it saves you the trouble of modeling your own content and later realizing it's not compatible with anyone else's content.
  • What is Structured Data for Advanced SEO?
    1 project | dev.to | 8 Aug 2021
    JSON-LD is a format to create a unified structured data vocabulary for the web. If you want to read more about JSON-LD, then read this https://json-ld.org/. But I want to focus here on how you can use it in your projects to use SEO for maximum traction.
  • Standard for metadata sidecar files like .metadata.json?
    1 project | reddit.com/r/datacurator | 3 Jun 2021
    I'm facing a similar issue and decided to use JSON Linked Data.
  • Advice on File Structure for REST API
    1 project | reddit.com/r/symfony | 26 May 2021
    Order of formats matters. The first is the returned format by default, so in this case default returned data is in ld+json format (instead of plain json). It's simply better ;-) (here's why)
  • Nano.Community Update — SEO ready
    3 projects | reddit.com/r/nanocurrency | 14 May 2021
    what do you recommend? is this the spec that should be used https://json-ld.org/ ?
  • Vue.js SEO without Server Side Rendering
    2 projects | reddit.com/r/vuejs | 31 Mar 2021
    providing explicit clues about the meaning of a page to Google by including structured data on the page. like https://json-ld.org/
  • The common misconception about TypeScript
    6 projects | dev.to | 21 Mar 2021
    Implement dynamic schema validation system and let the front-end fetch infer the schema from the backend and change it's validation flow accordingly, by this way you can avoid changing schema at multiple places. Check [https://json-ld.org/] for a similar analogy.
  • Launch HN: Athens Research (YC W21) – Open-Source Roam Research
    16 projects | news.ycombinator.com | 2 Mar 2021
    I've been thinking of a tool to generate a kind of schema for a website, similar to RDF[0] or JSON-LD[1]. The end goal of this would be interoperability between tools - ideally I could browse HN and other related sites or forums in my RSS reader with a unified interface, or translate the Roam note format into the Athens equivalent to use with either.

    [0] https://en.wikipedia.org/wiki/Resource_Description_Framework

    [1] https://json-ld.org/

What are some alternatives?

When comparing ultrajson and PyLD you can also consider the following projects:

marshmallow - A lightweight library for converting complex objects to and from simple Python datatypes.

greenpass-covid19-qrcode-decoder - An easy tool for decoding Green Pass Covid-19 QrCode

python-rapidjson - Python wrapper around rapidjson

pysimdjson - Python bindings for the simdjson project.

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

serpy - ridiculously fast object serialization

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

hjson-py - Hjson for Python

jsons - 🐍 A Python lib for (de)serializing Python objects to/from JSON

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