mirror of
https://github.com/antonmedv/fx
synced 2024-11-19 03:25:28 +00:00
95 lines
1.7 KiB
Markdown
95 lines
1.7 KiB
Markdown
# fx [](https://travis-ci.org/antonmedv/fx)
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Command-line JSON processing tool
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## Features
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* Don't need to learn new syntax
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* Plain JavaScript
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* Formatting and highlighting
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## Install
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```
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$ npm install -g fx
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```
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## Usage
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Pipe into `fx` any JSON and anonymous function for reducing it.
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```
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$ fx [code ...]
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```
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Pretty print JSON:
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```
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$ echo '{"key":"value"}' | fx
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{
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"key": "value"
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}
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```
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Use anonymous function:
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```
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$ echo '{"foo": [{"bar": "value"}]}' | fx "x => x.foo[0].bar"
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"value"
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```
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If you don't pass anonymous function `param => ...`, code will be automatically transformed into anonymous function.
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And you can get access to JSON by `this` keyword:
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```
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$ echo '{"foo": [{"bar": "value"}]}' | fx "this.foo[0].bar"
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"value"
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```
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You can pass any number of anonymous functions for reducing JSON:
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```
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$ echo '{"foo": [{"bar": "value"}]}' | fx "x => x.foo" "this[0]" "this.bar"
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"value"
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```
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If passed code contains `yield` keyword, [generator expression](https://github.com/sebmarkbage/ecmascript-generator-expression)
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will be used:
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```
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$ curl ... | fx "for (let user of this) if (user.login.startsWith('a')) yield user"
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```
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Access to JSON through `this` keyword:
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```
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$ echo '["a", "b"]' | fx "yield* this"
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[
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"a",
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"b"
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]
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```
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```
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$ echo '["a", "b"]' | fx "yield* this; yield 'c';"
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[
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"a",
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"b",
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"c"
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]
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```
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You can update existing JSON using spread operator:
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```
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$ echo '{"count": 0}' | fx "{...this, count: 1}"
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{
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"count": 1
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}
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```
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## Related
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* [jq](https://github.com/stedolan/jq) – cli JSON processor on C
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* [jsawk](https://github.com/micha/jsawk) – like awk, but for JSON
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* [json](https://github.com/trentm/json) – another JSON manipulating cli library
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## License
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MIT
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