96 lines
1.6 KiB
Markdown
96 lines
1.6 KiB
Markdown
---
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title: "json"
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description: "JSON encoding and decoding"
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weight: 80
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type: "docs"
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---
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JSON encoding and decoding.
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```javascript
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var json = use('json')
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```
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## Encoding
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### json.encode(value, space, replacer, whitelist)
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Convert a value to JSON text.
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```javascript
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json.encode({a: 1, b: 2})
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// '{"a":1,"b":2}'
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// Pretty print with 2-space indent
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json.encode({a: 1, b: 2}, 2)
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// '{
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// "a": 1,
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// "b": 2
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// }'
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```
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**Parameters:**
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- **value** — the value to encode
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- **space** — indentation (number of spaces or string)
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- **replacer** — function to transform values
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- **whitelist** — array of keys to include
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```javascript
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// With replacer
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json.encode({a: 1, b: 2}, null, function(key, value) {
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if (key == "b") return value * 10
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return value
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})
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// '{"a":1,"b":20}'
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// With whitelist
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json.encode({a: 1, b: 2, c: 3}, null, null, ["a", "c"])
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// '{"a":1,"c":3}'
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```
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## Decoding
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### json.decode(text, reviver)
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Parse JSON text to a value.
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```javascript
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json.decode('{"a":1,"b":2}')
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// {a: 1, b: 2}
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json.decode('[1, 2, 3]')
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// [1, 2, 3]
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```
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**Parameters:**
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- **text** — JSON string to parse
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- **reviver** — function to transform parsed values
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```javascript
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// With reviver
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json.decode('{"date":"2024-01-15"}', function(key, value) {
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if (key == "date") return parse_date(value)
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return value
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})
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```
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## Example
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```javascript
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var json = use('json')
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// Save configuration
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var config = {
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debug: true,
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maxRetries: 3,
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endpoints: ["api.example.com"]
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}
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var config_text = json.encode(config, 2)
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// Load configuration
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var loaded = json.decode(config_text)
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print(loaded.debug) // true
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```
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