Unable to parse JSON array in Golang

Question

I am having hard time parsing following JSON array.

// JSON Array
[      
  {
    "ShaId": "adf56a4d",
    "Regions": [
      {
        "Name": "us-east-1a"
      }
    ]
  }
 .... more such
]

Link to Go Playground :- https://play.golang.org/p/D4VrX3uoE8

Where am I making mistake?

icza · Accepted Answer · 2015-03-20 11:08:36Z

2

This is your original JSON input:

content := `{"ShaId": "adf56a4d", "Regions": [{"Name": "us-east-1a"}]}`

It is not an array, change it to:

content := `[{"ShaId": "adf56a4d", "Regions": [{"Name": "us-east-1a"}]}]`

With this, the result:

Results: []main.ShaInfo{main.ShaInfo{ShaId:"adf56a4d",
                Regions:main.Region{struct { Name string }{Name:"us-east-1a"}}}}

Note:

If you input is not an array, then don't try to parse an array (slice) out of it, just one ShaInfo. This also works if you don't/can't modify the input:

var data ShaInfo
content := `{"ShaId": "adf56a4d", "Regions": [{"Name": "us-east-1a"}]}`
json.Unmarshal([]byte(content), &data)

Output:

Results: main.ShaInfo{ShaId:"adf56a4d",
              Regions:main.Region{struct { Name string }{Name:"us-east-1a"}}}

edited Mar 20, 2015 at 11:08

answered Mar 20, 2015 at 11:03

icza

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3 Comments

Dhanu Gurung Over a year ago

Will this work if I fetch the content reading any json file with above json?

icza Over a year ago

@ram It doesn't matter where the JSON is coming from. But if your input JSON is not an array, then don't try to parse an array (slice) out of it, just one ShaInfo.

Phylogenesis Over a year ago

Either this, or change the definition of data to ShaInfo rather than []ShaInfo.

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