jmoiron / jsonq Goto Github PK

simple json field access for golang

License: MIT License

Shell 2.09% Go 97.91%

jsonq's Introduction

jsonq

Simplify your golang json usage by extracting fields or items from arrays and objects with a simple, hierarchical query. API Documentation on godoc.org.

This package is meant to make working with complex feeds a bit more easy. If you have simple feeds you want to model with struct types, check out jflect, which will create struct definitions given a json document.

installing

go get github.com/jmoiron/jsonq

usage

Given some json data like:

{
	"foo": 1,
	"bar": 2,
	"test": "Hello, world!",
	"baz": 123.1,
	"array": [
		{"foo": 1},
		{"bar": 2},
		{"baz": 3}
	],
	"subobj": {
		"foo": 1,
		"subarray": [1,2,3],
		"subsubobj": {
			"bar": 2,
			"baz": 3,
			"array": ["hello", "world"]
		}
	},
	"bool": true
}

Decode it into a map[string]interface{}:

import (
	"strings"
	"encoding/json"
	"github.com/jmoiron/jsonq"
)

data := map[string]interface{}{}
dec := json.NewDecoder(strings.NewReader(jsonstring))
dec.Decode(&data)
jq := jsonq.NewQuery(data)

From here, you can query along different keys and indexes:

// data["foo"] -> 1
jq.Int("foo")

// data["subobj"]["subarray"][1] -> 2
jq.Int("subobj", "subarray", "1")

// data["subobj"]["subarray"]["array"][0] -> "hello"
jq.String("subobj", "subsubobj", "array", "0")

// data["subobj"] -> map[string]interface{}{"subobj": ...}
obj, err := jq.Object("subobj")

Missing keys, out of bounds indexes, and type failures will return errors. For simplicity, integer keys (ie, {"0": "zero"}) are inaccessible by jsonq as integer strings are assumed to be array indexes.

The Int and Float methods will attempt to parse numbers from string values to ease the use of many real world feeds which deliver numbers as strings.

Suggestions/comments please tweet @jmoiron

jsonq's People

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jsonq's Issues

The worst documented piece of sh- I mean code in the world!

I have to use this piece of garb- beauty but sadly this sh- package has little to no documentation

Length() function

It would be cool to have a shorthand way of getting the length of a JSON array. For example with this JSON:

{
  "data" : [1, 2, 3]
}

... I currently need to do this to check the length:

arr, _ := jq.Array("data")
fmt.Println( len(arr) )

It would be nice to be able to do this:

fmt.Println( jq.Length("data") )

A small thing, but very handy.

Confusion About Integer String Keys

I've read the following multiple times and I still don't get it.

"""
For simplicity, integer keys (ie, {"0": "zero"}) are inaccessible by jsonq as integer strings are assumed to be array indexes.
"""

How can I access the string "Foo" in the following JSON response with jsonq?

{
  "534" : {
    "aliases" : {
      "Foo" : { }
    }
  }
}

Parsing of Arrays

Hi,

Please add example about how to Parse Arrays with JSONQ. Example response to parse is

[
{
"tmdb_id": "261825",
"imdb_id": "tt3576084",
"name": "Zero Motivation",
"new_images": "1",
"total_images": "3"
},
{
"tmdb_id": "304357",
"imdb_id": "tt2404425",
"name": "Woman in Gold",
"new_images": "4",
"total_images": "4"
},
{
"tmdb_id": "856",
"imdb_id": "tt0096438",
"name": "Who Framed Roger Rabbit",
"new_images": "1",
"total_images": "20"
},
{
"tmdb_id": "252512",
"imdb_id": "tt1791682",
"name": "While We're Young",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "52783",
"imdb_id": "",
"name": "Wall Street Collection",
"new_images": "1",
"total_images": "2"
},
{
"tmdb_id": "58244",
"imdb_id": "tt1374992",
"name": "Upside Down",
"new_images": "1",
"total_images": "28"
},
{
"tmdb_id": "1997",
"imdb_id": "tt0338512",
"name": "Two Brothers",
"new_images": "1",
"total_images": "6"
},
{
"tmdb_id": "271718",
"imdb_id": "tt3152624",
"name": "Trainwreck",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "290764",
"imdb_id": "tt2401097",
"name": "Tracers",
"new_images": "5",
"total_images": "7"
},
{
"tmdb_id": "11194",
"imdb_id": "tt0379557",
"name": "Touching the Void",
"new_images": "3",
"total_images": "3"
},
{
"tmdb_id": "158852",
"imdb_id": "tt1964418",
"name": "Tomorrowland",
"new_images": "12",
"total_images": "30"
},
{
"tmdb_id": "597",
"imdb_id": "tt0120338",
"name": "Titanic",
"new_images": "1",
"total_images": "32"
},
{
"tmdb_id": "285783",
"imdb_id": "tt3488710",
"name": "The Walk",
"new_images": "2",
"total_images": "2"
},
{
"tmdb_id": "269026",
"imdb_id": "tt2219214",
"name": "The Toy Soldiers",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "208284",
"imdb_id": "tt2733258",
"name": "The Strange Colour of Your Body's Tears",
"new_images": "1",
"total_images": "2"
},
{
"tmdb_id": "9779",
"imdb_id": "tt0403508",
"name": "The Sisterhood of the Traveling Pants",
"new_images": "2",
"total_images": "2"
},
{
"tmdb_id": "11843",
"imdb_id": "tt0072081",
"name": "The Return of the Pink Panther",
"new_images": "1",
"total_images": "8"
},
{
"tmdb_id": "22752",
"imdb_id": "tt0034091",
"name": "The Reluctant Dragon",
"new_images": "1",
"total_images": "5"
},
{
"tmdb_id": "284289",
"imdb_id": "tt2911668",
"name": "The Reach",
"new_images": "7",
"total_images": "8"
},
{
"tmdb_id": "11130",
"imdb_id": "tt0368933",
"name": "The Princess Diaries 2: Royal Engagement",
"new_images": "1",
"total_images": "5"
},
{
"tmdb_id": "936",
"imdb_id": "tt0057413",
"name": "The Pink Panther",
"new_images": "1",
"total_images": "8"
},
{
"tmdb_id": "12096",
"imdb_id": "tt0383216",
"name": "The Pink Panther",
"new_images": "1",
"total_images": "17"
},
{
"tmdb_id": "15159",
"imdb_id": "tt0838232",
"name": "The Pink Panther 2",
"new_images": "1",
"total_images": "16"
},
{
"tmdb_id": "193610",
"imdb_id": "tt2203939",
"name": "The Other Woman",
"new_images": "1",
"total_images": "26"
},
{
"tmdb_id": "34584",
"imdb_id": "tt0088323",
"name": "The NeverEnding Story",
"new_images": "1",
"total_images": "9"
},
{
"tmdb_id": "121",
"imdb_id": "tt0167261",
"name": "The Lord of the Rings: The Two Towers",
"new_images": "2",
"total_images": "63"
},
{
"tmdb_id": "122",
"imdb_id": "tt0167260",
"name": "The Lord of the Rings: The Return of the King",
"new_images": "6",
"total_images": "67"
},
{
"tmdb_id": "120",
"imdb_id": "tt0120737",
"name": "The Lord of the Rings: The Fellowship of the Ring",
"new_images": "6",
"total_images": "73"
},
{
"tmdb_id": "10150",
"imdb_id": "tt0084237",
"name": "The Last Unicorn",
"new_images": "1",
"total_images": "5"
},
{
"tmdb_id": "616",
"imdb_id": "tt0325710",
"name": "The Last Samurai",
"new_images": "2",
"total_images": "27"
},
{
"tmdb_id": "335521",
"imdb_id": "",
"name": "The King of Devil's Island",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "205587",
"imdb_id": "tt1872194",
"name": "The Judge",
"new_images": "1",
"total_images": "33"
},
{
"tmdb_id": "228967",
"imdb_id": "tt2788710",
"name": "The Interview",
"new_images": "1",
"total_images": "20"
},
{
"tmdb_id": "131631",
"imdb_id": "tt1951265",
"name": "The Hunger Games: Mockingjay - Part 1",
"new_images": "1",
"total_images": "77"
},
{
"tmdb_id": "2428",
"imdb_id": "tt0059245",
"name": "The Greatest Story Ever Told",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "255157",
"imdb_id": "tt2376218",
"name": "The Forger",
"new_images": "1",
"total_images": "4"
},
{
"tmdb_id": "81870",
"imdb_id": "tt1686784",
"name": "The Flying Swords of Dragon Gate",
"new_images": "4",
"total_images": "10"
},
{
"tmdb_id": "166424",
"imdb_id": "tt1502712",
"name": "The Fantastic Four",
"new_images": "2",
"total_images": "11"
},
{
"tmdb_id": "409",
"imdb_id": "tt0116209",
"name": "The English Patient",
"new_images": "1",
"total_images": "12"
},
{
"tmdb_id": "11532",
"imdb_id": "tt0089087",
"name": "The Emerald Forest",
"new_images": "2",
"total_images": "2"
},
{
"tmdb_id": "9954",
"imdb_id": "tt0475944",
"name": "The Covenant",
"new_images": "1",
"total_images": "12"
},
{
"tmdb_id": "2667",
"imdb_id": "tt0185937",
"name": "The Blair Witch Project",
"new_images": "1",
"total_images": "8"
},
{
"tmdb_id": "239220",
"imdb_id": "tt2273575",
"name": "The Advocate",
"new_images": "3",
"total_images": "3"
},
{
"tmdb_id": "295699",
"imdb_id": "tt2937696",
"name": "That's What I'm Talking About",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "23629",
"imdb_id": "tt0978764",
"name": "Sucker Punch",
"new_images": "8",
"total_images": "122"
},
{
"tmdb_id": "1892",
"imdb_id": "tt0086190",
"name": "Star Wars: Episode VI - Return of the Jedi",
"new_images": "1",
"total_images": "81"
},
{
"tmdb_id": "1891",
"imdb_id": "tt0080684",
"name": "Star Wars: Episode V - The Empire Strikes Back",
"new_images": "1",
"total_images": "90"
},
{
"tmdb_id": "11",
"imdb_id": "tt0076759",
"name": "Star Wars: Episode IV - A New Hope",
"new_images": "1",
"total_images": "97"
},
{
"tmdb_id": "1895",
"imdb_id": "tt0121766",
"name": "Star Wars: Episode III - Revenge of the Sith",
"new_images": "1",
"total_images": "82"
},
{
"tmdb_id": "1894",
"imdb_id": "tt0121765",
"name": "Star Wars: Episode II - Attack of the Clones",
"new_images": "1",
"total_images": "118"
},
{
"tmdb_id": "1893",
"imdb_id": "tt0120915",
"name": "Star Wars: Episode I - The Phantom Menace",
"new_images": "1",
"total_images": "102"
},
{
"tmdb_id": "10",
"imdb_id": "",
"name": "Star Wars Collection",
"new_images": "1",
"total_images": "35"
},
{
"tmdb_id": "238713",
"imdb_id": "tt3079380",
"name": "Spy",
"new_images": "1",
"total_images": "16"
},
{
"tmdb_id": "13850",
"imdb_id": "tt0038969",
"name": "Song of the South",
"new_images": "4",
"total_images": "5"
},
{
"tmdb_id": "223485",
"imdb_id": "tt3205376",
"name": "Slow West",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "67195",
"imdb_id": "",
"name": "Slipknot: Sicnesses",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "21416",
"imdb_id": "tt0350815",
"name": "Slipknot: Disasterpieces",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "810",
"imdb_id": "tt0413267",
"name": "Shrek the Third",
"new_images": "4",
"total_images": "29"
},
{
"tmdb_id": "10192",
"imdb_id": "tt0892791",
"name": "Shrek Forever After",
"new_images": "6",
"total_images": "44"
},
{
"tmdb_id": "808",
"imdb_id": "tt0126029",
"name": "Shrek",
"new_images": "5",
"total_images": "29"
},
{
"tmdb_id": "809",
"imdb_id": "tt0298148",
"name": "Shrek 2",
"new_images": "4",
"total_images": "22"
},
{
"tmdb_id": "37786",
"imdb_id": "tt1261945",
"name": "Sex and the City 2",
"new_images": "1",
"total_images": "11"
},
{
"tmdb_id": "254128",
"imdb_id": "tt2126355",
"name": "San Andreas",
"new_images": "4",
"total_images": "22"
},
{
"tmdb_id": "29993",
"imdb_id": "tt0041838",
"name": "Samson and Delilah",
"new_images": "2",
"total_images": "2"
},
{
"tmdb_id": "14906",
"imdb_id": "tt0036326",
"name": "Saludos Amigos",
"new_images": "1",
"total_images": "3"
},
{
"tmdb_id": "11329",
"imdb_id": "tt0313542",
"name": "Runaway Jury",
"new_images": "1",
"total_images": "7"
},
{
"tmdb_id": "2800",
"imdb_id": "tt0398375",
"name": "Rumor has it...",
"new_images": "3",
"total_images": "20"
},
{
"tmdb_id": "36797",
"imdb_id": "tt0120029",
"name": "RocketMan",
"new_images": "1",
"total_images": "2"
},
{
"tmdb_id": "61791",
"imdb_id": "tt1318514",
"name": "Rise of the Planet of the Apes",
"new_images": "1",
"total_images": "50"
},
{
"tmdb_id": "500",
"imdb_id": "tt0105236",
"name": "Reservoir Dogs",
"new_images": "1",
"total_images": "27"
},
{
"tmdb_id": "15199",
"imdb_id": "tt1273675",
"name": "Rent: Filmed Live on Broadway",
"new_images": "1",
"total_images": "2"
},
{
"tmdb_id": "11330",
"imdb_id": "tt0425379",
"name": "Pusher 3",
"new_images": "1",
"total_images": "2"
},
{
"tmdb_id": "41124",
"imdb_id": "tt1626645",
"name": "Porcupine Tree: Anesthetize",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "243688",
"imdb_id": "tt1029360",
"name": "Poltergeist",
"new_images": "3",
"total_images": "8"
},
{
"tmdb_id": "15393",
"imdb_id": "tt0067588",
"name": "Play Misty for Me",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "11020",
"imdb_id": "tt0073540",
"name": "Picnic at Hanging Rock",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "10312",
"imdb_id": "tt0129290",
"name": "Patch Adams",
"new_images": "5",
"total_images": "9"
},
{
"tmdb_id": "116149",
"imdb_id": "tt1109624",
"name": "Paddington",
"new_images": "6",
"total_images": "31"
},
{
"tmdb_id": "43209",
"imdb_id": "tt1653690",
"name": "Ong Bak 3",
"new_images": "1",
"total_images": "5"
},
{
"tmdb_id": "90369",
"imdb_id": "tt1937264",
"name": "Now Is Good",
"new_images": "2",
"total_images": "25"
},
{
"tmdb_id": "210860",
"imdb_id": "tt3045616",
"name": "Mortdecai",
"new_images": "2",
"total_images": "22"
},
{
"tmdb_id": "15660",
"imdb_id": "tt0082766",
"name": "Mommie Dearest",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "1700",
"imdb_id": "tt0100157",
"name": "Misery",
"new_images": "1",
"total_images": "9"
},
{
"tmdb_id": "42826",
"imdb_id": "",
"name": "Meshuggah: Alive",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "298861",
"imdb_id": "",
"name": "Meshuggah - The Ophidian Trek",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "7270",
"imdb_id": "tt0325805",
"name": "Matchstick Men",
"new_images": "2",
"total_images": "5"
},
{
"tmdb_id": "272077",
"imdb_id": "",
"name": "Mastodon - Live at Brixton",
"new_images": "2",
"total_images": "2"
},
{
"tmdb_id": "20343",
"imdb_id": "tt0038718",
"name": "Make Mine Music!",
"new_images": "2",
"total_images": "4"
},
{
"tmdb_id": "76341",
"imdb_id": "tt1392190",
"name": "Mad Max: Fury Road",
"new_images": "1",
"total_images": "44"
},
{
"tmdb_id": "637",
"imdb_id": "tt0118799",
"name": "Life Is Beautiful",
"new_images": "1",
"total_images": "12"
},
{
"tmdb_id": "947",
"imdb_id": "tt0056172",
"name": "Lawrence of Arabia",
"new_images": "1",
"total_images": "14"
},
{
"tmdb_id": "3163",
"imdb_id": "tt0068559",
"name": "La maldición de Frankenstein",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "244563",
"imdb_id": "tt3263614",
"name": "Kumiko, the Treasure Hunter",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "207703",
"imdb_id": "tt2802144",
"name": "Kingsman: The Secret Service",
"new_images": "1",
"total_images": "36"
},
{
"tmdb_id": "11543",
"imdb_id": "tt0116778",
"name": "Kingpin",
"new_images": "2",
"total_images": "12"
},
{
"tmdb_id": "254",
"imdb_id": "tt0360717",
"name": "King Kong",
"new_images": "3",
"total_images": "27"
},
{
"tmdb_id": "37821",
"imdb_id": "tt1103153",
"name": "Killers",
"new_images": "2",
"total_images": "43"
},
{
"tmdb_id": "16859",
"imdb_id": "tt0097814",
"name": "Kiki's Delivery Service",
"new_images": "1",
"total_images": "35"
},
{
"tmdb_id": "29710",
"imdb_id": "tt0060588",
"name": "Khartoum",
"new_images": "1",
"total_images": "3"
},
{
"tmdb_id": "135397",
"imdb_id": "tt0369610",
"name": "Jurassic World",
"new_images": "2",
"total_images": "42"
},
{
"tmdb_id": "20533",
"imdb_id": "tt1075747",
"name": "Jonah Hex",
"new_images": "3",
"total_images": "18"
},
{
"tmdb_id": "49529",
"imdb_id": "tt0401729",
"name": "John Carter",
"new_images": "3",
"total_images": "64"
},
{
"tmdb_id": "67037",
"imdb_id": "tt1412459",
"name": "Jeff Beck: Performing This Week... Live at Ronnie Scotts",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "305662",
"imdb_id": "",
"name": "Jeff Beck - Live in Tokyo",
"new_images": "1",
"total_images": "1"
},
{
"tmdb_id": "578",
"imdb_id": "tt0073195",
"name": "Jaws",
"new_images": "1",
"total_images": "23"
},
{
"tmdb_id": "81005",
"imdb_id": "tt1351685",
"name": "Jack the Giant Slayer",
"new_images": "8",
"total_images": "49"
},
{
"tmdb_id": "75780",
"imdb_id": "tt0790724",
"name": "Jack Reacher",
"new_images": "1",
"total_images": "25"
},
{
"tmdb_id": "1726",
"imdb_id": "tt0371746",
"name": "Iron Man",
"new_images": "2",
"total_images": "73"
},
{
"tmdb_id": "10138",
"imdb_id": "tt1228705",
"name": "Iron Man 2",
"new_images": "3",
"total_images": "92"
},
{
"tmdb_id": "628",
"imdb_id": "tt0110148",
"name": "Interview with the Vampire",
"new_images": "1",
"total_images": "18"
},
{
"tmdb_id": "157336",
"imdb_id": "tt0816692",
"name": "Interstellar",
"new_images": "2",
"total_images": "68"
},
{
"tmdb_id": "256474",
"imdb_id": "tt2101570",
"name": "In the Blood",
"new_images": "1",
"total_images": "8"
},
{
"tmdb_id": "46529",
"imdb_id": "tt1464540",
"name": "I Am Number Four",
"new_images": "7",
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}
]

Thanks

Is a top-level array not supported ?

I am trying to parse an array but cannot get is to work.
My test code below produces an error: Array index on non-array map[]
Is a first top-level array not supported ?

var jdata =[ { "elem1": { "id": 1 } }, { "elem2": { "id": 1 } } ]

func main() {
data := map[string]interface{}{}
dec := json.NewDecoder(strings.NewReader(jdata))
dec.Decode(&data)
jq := jsonq.NewQuery(data)
v, err := jq.Int("0", "elem1", "id")
if err != nil {
fmt.Printf("ERROR: %s\n", err)
return
}
fmt.Printf("%v\n", v)
}

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