JsonPath
lol-html
JsonPath | lol-html | |
---|---|---|
10 | 8 | |
8,648 | 1,396 | |
0.9% | 1.1% | |
6.3 | 5.7 | |
about 1 month ago | about 2 months ago | |
Java | Rust | |
Apache License 2.0 | BSD 3-clause "New" or "Revised" License |
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JsonPath
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Refactoring Toward Configurability
For this example, we will use JSON files to encode the application's behavior and query it using JSONPath.
- Ask HN: What is something you built but never marketed?
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Running Jenkins on PR in Azure DevOps
As shown above in order to access the root element of a JSON payload we can create variable (data) and assign the $ (using Json Path convention) in the expression tab.
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what's the best way to search all child objects in java?
You certainly could implement a recursive traversal, as /u/raevnos suggested, but it might be easier to use something like JsonPath to do it for you.
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Query with jsonpath
If you work with REST interfaces for any amount of time, you'll run into "json path". You can extract and manipulate the json received with an API call.
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How would experienced devs handle checking JSON objects for specific property condition?
Look into JSONPath and its one Java implementation.
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Like JQ, but for HTML
is anyone else using the https://github.com/json-path/JsonPath over the jq route?
I hope we standardize on some jq query language, like we have with a base set of SQL syntax
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Which JSON parsers do not require me to duplicate the document model?
I use JsonPath for this. This fits my use case of picking apart JSON responses from APIs in Cucumber tests, which is based on textual descriptions and I'm not using Java classes for the mapping.
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Serverless Complex Event Processing with Apache Flink
flatMap — A Map function (can be of Rich type if need be) that extracts data from the input event which is a stringified JSON object. Of the three flapMaps, two of them extract & parse the relevant data into a defined model (the data modelling is based on POJO — plain old java object classes.) using JsonPath, the third flapMap is a RichCoFlatMapFunction that determines after correlating events from the two sources whether it should be forwarded to the sink or not.
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Traversing nested data-structures in various languages
JSONPath confers pretty much the same concept onto JSON too with much the same syntax. There are JPath implementations for most languages now.
> https://github.com/json-path/JsonPath
lol-html
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Ask HN: A fast, Rust HTML parser that works?
So I'm doing some web scraping in Rust, and so I will need to parse HTML. [scraper](https://docs.rs/scraper/latest/scraper/) (which uses [html5ever](https://github.com/servo/html5ever)) is doing fine except that it's the bottleneck of my application.
So I need a faster parser. I've tried [tl](https://docs.rs/tl/latest/tl/) which would've been perfect except that it doesn't actually work on the HTML I have. When I try to `query_selector` the elements I need, it returns nothing.
[Kuchiki](https://docs.rs/kuchiki/latest/kuchiki/) is abandonded.
I couldn't figure out how to get [lol-html](https://github.com/cloudflare/lol-html) to work for me (it's designed for re-writing HTML, whatever that means). It doesn't seem to have an API to extract the inner text of an element.
[html5gum](https://github.com/untitaker/html5gum) seems to be just an HTML tokenizer, or otherwise just too low-level. I have not yet tried [quick-xml](https://github.com/tafia/quick-xml/) but judging from the README, it's pretty low-level too. I mean, if these are the only options left then I will try them. Otherwise, I would love to use a parser that's faster but as ergonomic as `scraper` or `tl`.
At this point, I would be happy with an Lxml bridge/port of some sort. I don't need to mutate HTML, just parse and read data from it.
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How much Rust work is actually going on at Cloudflare?
I'm also in the Workers org but I have had a bit of interaction with Rust. There's some Rust in the Workers runtime using lol-html for HTMLRewriter as well as some tooling and there's the full blown workers-rs framework that I work on, but that's about it for the Rust I work on regularly.
- Is there a library for manipulating HTML?
- pup: Parsing HTML at the Command Line
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Texting Robots: Taming robots.txt with Rust and 34 million tests
Thanks again and happy to answer any questions! My current unreleased Rust projects include a web crawler that uses Tokio + Tokio Console + Reqwest with this crate for robots.txt and a fast text extraction library using lol-html that I am planning to sprinkle with some minimal ML to get Readability.js style intelligent extraction (with training in Python). See Fathom for an example of the ML approach I'll likely take.
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Like JQ, but for HTML
I’d like to see a tool using lol-html [0] and their CSS selector API as a streaming HTML editor.
[0] https://github.com/cloudflare/lol-html
- Things you can’t do in Rust (and what to do instead)
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Problems with building a backend app in Rust in 2020
Cloudflare has open sourced lol-html, a "Low output latency streaming HTML parser/rewriter with CSS selector-based API". Is that what you are looking for?
What are some alternatives?
Jolt - JSON to JSON transformation library written in Java.
actor-rust-scraper - Experimental scraper in Rust suited for running locally or on the Apify platform. Inspired by Apify SDK.
fastjson - FASTJSON 2.0.x has been released, faster and more secure, recommend you upgrade.
tq - Perform a lookup by CSS selector on an HTML input
JsonSurfer - A streaming JsonPath processor in Java
yq - Command-line YAML, XML, TOML processor - jq wrapper for YAML/XML/TOML documents
JSLT - JSON query and transformation language
tools - all-in collection of productivity scripts, CLI tools, utility libraries, fuse filesystems, and also some stuff
sawmill - Sawmill is a JSON transformation Java library
hq - lightweight command line HTML processor using CSS and XPath selectors
jsoup - jsoup: the Java HTML parser, built for HTML editing, cleaning, scraping, and XSS safety.
cargo-expand - Subcommand to show result of macro expansion