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JavaScript Engine

Starting from version 0.8.6, multiple JavaScript engines are supported. To specify a particular engine, use the js_engine directive available for both the and . By default, the njs engine is used.

 njs is an embeddable JavaScript engine developed as a part of the njs module. See the section for details.

 is a lightweight, embeddable JavaScript engine that supports the specification, including features as modules, asynchronous generators, proxies and BigInt.

Since version 0.8.6, a drop-in replacement for njs/nginx objects has been introduced to ensure compatibility with the njs engine, with the following exceptions:

• nginx modules API: ngx.fetch(), ngx.shared.dict.
• Built-in modules: fs, crypto, WebCrypto, xml.
• njs-specific API: njs.dump(), njs.on, console.dump().
• js_preload_object directive for and .