yusufnb / Verify Json
Licence: mit
verify-json
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Verify JSON
Library to verify JSON structure easily using a lightweight JSON schema syntax
About
This project results from my need to verify JSON schema in a lightweight manner, without the need for an extensive definition and development code.
The schema syntax is minimalist and extremely easy to write.
Installation
npm install -s verify-json
const verify = require('verify-json')
import verify from 'verify-json';
Example
const { verify } = require("verify-json");
let json = {
markers: [
{
stars: 5,
name: 'Rixos The Palm Dubai',
location: [25.1212, 55.1535],
favorite: true,
color: 'red',
},
{
stars: 4,
name: 'Shangri-La Hotel',
location: [25.2084, 55.2719],
color: 'blue',
},
],
};
// <key>:<validator>
// <key>:?<validator> - uses ? for optional
// <key> - required non null attribute of any type
// Skip all the quotations
const schema = `{markers: [{
stars:i,
name:string,
location:[:lat,:long],
favorite:?b,
color:color
}]
}`;
// customValidators are optional. See built-in validators.
const customValidators = {
lat: (val) => val >= -90 && val <= 90,
long: (val) => val >= -180 && val <= 180,
color: (val, args) => {
// demonstrating conditional validations. args = { json, path, parent }
return (args.parent.stars === 5 && val === 'red') || (args.parent.stars === 4 && val === 'blue');
},
};
let result = verify(json, schema, customValidators);
console.log(result); // true
json.markers[0].location[0] = 1000;
json.markers[0].color = 'blue';
try {
verify(json, schema, customValidators);
} catch (error) {
console.log('error', error); // json.markers.0.location.0: validation failed, json.markers.0.color: validation failed
}
Built-in Validators
Following validators are built in and can be used directly -
{
string : _.isString,
s : _.isString, // alias for string
number : _.isNumber,
n : _.isNumber, // alias for number
boolean : _.isBoolean,
b : _.isBoolean, // alias for boolean
integer : _.isInteger,
i : _.isInteger, // alias for integer
}
Use as a mixin
Since lodash
is a dependency, this method is also exposed as a lodash mixin. Once imported anywhere, you can simply use _.verify
to access it.
_.verify(json, schema, customValidators)
License
MIT © Yusuf Bhabhrawala
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