GJSON
JSON-to-Go
GJSON | JSON-to-Go | |
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34 | 64 | |
13,636 | 4,383 | |
- | - | |
5.1 | 2.4 | |
11 days ago | 3 months ago | |
Go | JavaScript | |
MIT License | MIT License |
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GJSON
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Rob Pike: Gobs of data (2011)
Someone made a benchmark of serialization libraries in go [1], and I was surprised to see gobs is one of the slowest ones, specially for decoding. I suspect part of the reason is that the API doesn't not allow reusing decoders [2]. From my explorations it seems like both JSON [3], message-pack [4] and CBOR [5] are better alternatives.
By the way, in Go there are a like a million JSON encoders because a lot of things in the std library are not really coded for maximum performance but more for easy of usage, it seems. Perhaps this is the right balance for certain things (ex: the http library, see [6]).
There are also a bunch of libraries that allow you to modify a JSON file "in place", without having to fully deserialize into structs (ex: GJSON/SJSON [7] [8]). This sounds very convenient and more efficient that fully de/serializing if we just need to change the data a little.
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1: https://github.com/alecthomas/go_serialization_benchmarks
2: https://github.com/golang/go/issues/29766#issuecomment-45492...
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3: https://github.com/goccy/go-json
4: https://github.com/vmihailenco/msgpack
5: https://github.com/fxamacker/cbor
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6: https://github.com/valyala/fasthttp#faq
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7: https://github.com/tidwall/gjson
8: https://github.com/tidwall/sjson
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Jj: JSON Stream Editor
```
I don't think there is a way to sort an array, though. However, there is an option to have keys sorted. Personally, I don't think there is much annoyance in that. One could just pipe `jj` output to `sort | uniq -c`.
[0]: https://github.com/tidwall/gjson/blob/master/SYNTAX.md
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Library to analyze an arbitrary JSON string
I’m using GJSON, so far so good!
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Mapping json fields in api calls to a struct to store them in a database or cache
If the fields you need are just a small subset of the whole json, maybe https://github.com/tidwall/gjson might be of use to read only those (using jsonpath) without needing to create complete corresponding structs.
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Which CPU to buy based on profiling
Thank you for the reminder, it's never too much of it :) Didn't say it, but the code was pprof-iled many times and i can really say it's well optimized. I use own libraries with on-the-fly equations (sums, avgs, emas, stds, ...) wherever possible and also made custom json parser as json messages are in fixed format, so the parser is about 10x faster than gjson. I optimized it to the point that I avoided using maps, and rather iterate via slice where ever possible.
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Jetro - transform and query JSON format
You are right, for learning purposes this fit my needs, but I can imagine an approach similar to this repo: https://github.com/tidwall/gjson
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Any way to convert unknown/dynamic json to generic object structure
https://github.com/tidwall/gjson is a relatively sensible library if this is something you need to deal with and the structure is actually unknowable.
- Need help with getting the grandchild in nested JSON
- Double down on python or learn Go
- Ad hoc JSON parsing
JSON-to-Go
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JSON to Go Struct Converter
That site likely uses Matt's lib for that functionality: https://github.com/mholt/json-to-go
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Some annoying moments in Golang
https://mholt.github.io/json-to-go/ is a nice tool for generating a struct definition to fit some sample JSON.
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Need a pointer on how I can unmarshal this json
json-to-go is your friend.
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Ask HN: What are some Golang tools you can't live without?
JSON to struct. I use this about 100 times a day, no joke.
https://mholt.github.io/json-to-go/
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convert interface{} to []interface{}
Do your best to get static types on everything. Play a game with yourself where interface{} is banned and try to do your work. One of the most common sources of such loosely-typed values in JSON, so I'll point out this automatic struct generator for instance. If you have questions about a specific place you don't see how to avoid interface, feel free to ask. Every once in a while I do have to reach for something like this, but it should be rare.
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how to efficiently create structs to match the json response
But given we know ChatGPT can't accurately generate structs from even moderately complex json objects why bother doing all of that legwork of verifying and chiding chatgpt, when you can just drop it into a tool like https://mholt.github.io/json-to-go/ and get a correct struct in a fraction of the time?
- How to parse a Kubernetes YAML in Go?
- Is there a library or tool I can use to avoid manually setting json keys i.e. ‘json:”name”’ next to fields in structs?
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Do we have any vscode plugin to convert json to struct in Go?
I use https://marketplace.visualstudio.com/items?itemName=maracko.json-to-go, which is an extension version of https://mholt.github.io/json-to-go/
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Need help with getting the grandchild in nested JSON
I think using struct in such cases is almost always the right approach. There are tools which generates go structs from json this.
What are some alternatives?
jsoniter - A high-performance 100% compatible drop-in replacement of "encoding/json"
go-sanitize - :bathtub: Golang library of simple to use sanitation functions
go-json - Fast JSON encoder/decoder compatible with encoding/json for Go
Golang-PDF-to-Image-Converter - This project will help you to convert PDF file to IMAGE using golang.
intrinsic
Crypt - Crypt implementation in pure Go
gojson - Automatically generate Go (golang) struct definitions from example JSON
gowsdl - WSDL2Go code generation as well as its SOAP proxy
hub - A command-line tool that makes git easier to use with GitHub.
go-cmp - Package for comparing Go values in tests
ngrok - Unified ingress for developers
go-callvis - Visualize call graph of a Go program using Graphviz