https://github.com/solzimer/jsexpr
String and JSON expression interpolator and evaluator. Interpolates or evaluates a string against a json object, or transforms an object into another based on a json template.
https://github.com/solzimer/jsexpr
evaluation expression expression-evaluator expression-parser interpolation json string
Last synced: 6 months ago
JSON representation
String and JSON expression interpolator and evaluator. Interpolates or evaluates a string against a json object, or transforms an object into another based on a json template.
- Host: GitHub
- URL: https://github.com/solzimer/jsexpr
- Owner: solzimer
- Created: 2018-06-09T21:34:19.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2025-05-09T09:44:12.000Z (9 months ago)
- Last Synced: 2025-05-09T10:41:06.430Z (9 months ago)
- Topics: evaluation, expression, expression-evaluator, expression-parser, interpolation, json, string
- Language: JavaScript
- Homepage:
- Size: 1.3 MB
- Stars: 2
- Watchers: 1
- Forks: 0
- Open Issues: 10
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# jsexpr
JSON Expressions!
[](https://travis-ci.org/solzimer/jsexpr)
String and JSON expression interpolator and evaluator. Interpolates or evaluates a string against a json object, or transforms an object into another based on a json template.
## Installation
```
npm install jsexpr
```
## String Evaluation
```javascript
const expression = require("jsexpr");
var fn = expression.fn("(${host}=='mymachine' || ${host}=='yourmachine') && ${appName}=='su'");
// Result: false
var result = fn({host:"mymachine",appName:23});
```
## String Interpolation
```javascript
const expression = require("jsexpr");
var expr = expression.expr("/var/${date}/${client.address}/file.log");
// Result: /var/2017-01-01/localhost/file.log
var result = expr({date:"2017-01-01",client:{address:"localhost"}});
```
## Object Interpolation
```javascript
const expression = require("jsexpr");
var jsexpr = expression.expr({
time : "${client}/${address.host}:${address.port}",
data : {
request : {
headers : "${headers}"
}
}
});
var result = jsexpr({
client : "HOST001",
address : {
host : "localhost",
port : 8080
},
headers : "Content-Type: application/json"
});
```
### Object Interpolation Result
```javascript
{
time: 'HOST001/localhost:8080',
data: {
request: {
headers: 'Content-Type: application/json'
}
}
}
```
### JSON Stringify
```javascript
var input1 = {client : "HOST001", address : {host : "localhost", port : 8080}, headers : "Content-Type: application/json"};
let jxpr1 = expr.expr("${JSON}");
let jxpr2 = expr.expr("${JSON:address}");
let jxpr3 = expr.expr("${JSON:address:0}");
let jxpr4 = expr.expr("${JSON:0}");
// =>
{
"client": "HOST001",
"address": {
"host": "localhost",
"port": 8080
},
"headers": "Content-Type: application/json"
}
{
"host": "localhost",
"port": 8080
}
{"host":"localhost","port":8080}
{"client":"HOST001","address":{"host":"localhost","port":8080},"headers":"Content-Type: application/json"}
```