About nginScript

nginScript is a subset of the JavaScript language that allows implementing location and variable handlers in http and stream. nginScript is created in compliance with ECMAScript 5.1 with some ECMAScript 6 extensions. The compliance is still evolving.

• Boolean values, numbers, strings, objects, arrays, functions, and regular expressions
• ES5.1 operators, ES7 exponentiation operators
• ES5.1 statements: var, if, else, switch, for, for in, while, do while, break, continue, return, try, catch, throw, finally
• ES6 Number and Math properties and methods
• String methods:
  • ES5.1: fromCharCode, concat, slice, substring, substr, charAt, charCodeAt, indexOf, lastIndexOf, toLowerCase, toUpperCase, trim, search, match, split, replace
  • ES6: fromCodePoint, codePointAt, includes, startsWith, endsWith, repeat
  • non-standard: fromUTF8, toUTF8, fromBytes, toBytes
• Object: rudimentary Object.create() support without properties list
• Array methods:
  • ES5.1: isArray, slice, splice, push, pop, unshift, shift, reverse, sort, join, concat, indexOf, lastIndexOf, forEach, some, every, filter, map, reduce, reduceRight
  • ES7: includes
• ES5.1 Function methods: call, apply, bind
• ES5.1 RegExp methods: test, exec
• ES5.1 Date methods
• ES5.1 global functions: isFinite, isNaN, parseFloat, parseInt, decodeURI, decodeURIComponent, encodeURI, encodeURIComponent

• Scopes
• ES6 let and const declarations
• cycle for with var in declaration (for (var...)
• nested functions
• closures
• labels
• arguments array
• eval function
• JSON object
• Error object
• setTimeout, setInterval, setImmediate functions
• functions hoisting
• non-integer fractions (.235), exponential (3.35e10), binary (0b0101), octal (0o77), hexadecimal (0x1123) literals

nginScript is available in two modules:

• ngx_http_js_module
• ngx_stream_js_module

Both modules are not built by default, they should be either compiled from the sources or installed as a Linux package.

For Linux, nginScript modules packages can be used:

• nginx-module-njs — nginScript dynamic modules
• nginx-module-njs-dbg — debug symbols for the nginx-module-njs package

The repository with nginScript sources can be cloned with the following command: (requires Mercurial client):

hg clone http://hg.nginx.org/njs

Then the modules should be compiled using the --add_module configuration parameter:

./configure --add-module=path-to-njs/nginx

The modules can also be built as dynamic:

./configure --add-dynamic_module=path-to-njs/nginx

Both modules are experimental, caveat emptor applies.