JSON
JavaScript Object Notation (JSON) is a lightweight data-interchange format that is easy for humans to read and write. Furthermore, equally simple for machines to generate and/or parse. JSON is completely language agnostic and that's why it's the ideal interchange format.
To parse a JSON string received by another application or generated within your existing application:
import json
struct Customer {
first_name string
last_name string
hometown string
}
fn main() {
customers_string := '[{ "first_name": "Vitor", "last_name": "Oliveira", "hometown": "Rio de Janeiro" }, { "first_name": "Don", "last_name": "Nisnoni", "hometown": "Kupang" }]'
customers := json.decode([]Customer, customers_string) or {
eprintln('Failed to parse json')
return
}
// Print the list of customers
for customer in customers {
println('$customer.first_name $customer.last_name: $customer.hometown')
}
}
Creating a JSON string for communication or serialization is just as simple. We decode and encode in the example below:
import json
struct Customer {
first_name string
last_name string
hometown string
}
fn main() {
customer_string := '[{ "first_name": "Vitor", "last_name": "Oliveira", "hometown": "Rio de Janeiro"}]'
customer := json.decode([]Customer, customer_string) or {
eprintln('Failed to parse json')
return
}
encoded_json := json.encode(customer)
println(encoded_json)
}
- 1.Compare how you handle JSON in your favorite language and V.
- 2.Build an
Addressstruct that contains address information. - 3.Use the
Addressstruct to decode and encode a string that contains JSON format. - 4.Create 2 structs:
AddressandUserwhere a user has many addresses. Now receive a string with a nested JSON like'[{ "first_name": "Vitor", "last_name": "Oliveira", "hometown": "Rio de Janeiro", "addresses": [{ street_name: "Rua Princesa Isabel", city: "Rio de Janeiro", country: "Brazil" }] }]', decode and encode it.
Last modified 3yr ago