Esprima 3.0.5

dotnet add package Esprima --version 3.0.5
NuGet\Install-Package Esprima -Version 3.0.5
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Esprima" Version="3.0.5" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Esprima --version 3.0.5
#r "nuget: Esprima, 3.0.5"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Esprima as a Cake Addin
#addin nuget:?package=Esprima&version=3.0.5

// Install Esprima as a Cake Tool
#tool nuget:?package=Esprima&version=3.0.5
📣 Important notices
If you are upgrading from an older version, please note that version 3 ships with numerous breaking changes to the public API because virtually all areas of the library have been revised.<br />Documentation of the previous major version is available here.

Build NuGet MyGet

Esprima .NET (BSD license) is a .NET port of the project. It is a standard-compliant ECMAScript parser (also popularly known as JavaScript).



Esprima can be used to perform lexical analysis (tokenization) or syntactic analysis (parsing) of a JavaScript program.

A simple C# example:

var parser = new JavaScriptParser();
var program = parser.ParseScript("const answer = 42");

You can control the behavior of the parser by initializing and passing a ParserOptions to the parser's constructor. (For the available options, see the XML documentation of the ParserOptions class.)

Instead of ParseScript, you may use ParseModule or ParseExpression to make the parser treat the input as an ES6 module or as a plain JavaScript expression respectively.

In case the input is syntactically correct, each of these methods returns the root node of the resulting abstract syntax tree (AST), which you can freely analyze or transform. The library provides the AstVisitor and AstRewriter visitor classes to help you with such tasks.

When the input contains a severe syntax error, a ParserException is thrown. By catching it you can get details about the error. There are syntax errors though which can be tolerated by the parser. Such errors are ignored by default. You can record them by setting ParserOptions.ErrorHandler to an instance of CollectingErrorHandler. Alternatively, you can set ParserOptions.Tolerant to false to make the parser throw exceptions also in the case of tolerable syntax errors.

The library is able to write the AST (except for comments) back to JavaScript code:

var code = program.ToJavaScriptString(format: true);

It is also possible to serialize the AST into a JSON representation:

var astJson = program.ToJsonString(indent: "    ");

Considering the example above this call will return the following JSON:

    "type": "Program",
    "body": [
            "type": "VariableDeclaration",
            "declarations": [
                    "type": "VariableDeclarator",
                    "id": {
                        "type": "Identifier",
                        "name": "answer"
                    "init": {
                        "type": "Literal",
                        "value": 42,
                        "raw": "42"
            "kind": "const"
    "sourceType": "script",
    "strict": false


Here is a list of common JavaScript libraries and the time it takes to parse them, compared to the time it took for the same script using the original Esprima in Chrome.

Script Size Esprima .NET (.NET 6) Esprima (Chrome 116)
underscore-1.5.2 43 KB 1.0 ms 1.4 ms
backbone-1.1.0 59 KB 1.2 ms 1.6 ms
mootools-1.4.5 157 KB 5.2 ms 7.1 ms
jquery-1.9.1 262 KB 6.6 ms 7.9 ms
yui-3.12.0 330 KB 4.6 ms 6.9 ms 442 KB 10.0 ms 17.7 ms
angular-1.2.5 702 KB 8.5 ms 15.1 ms
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 is compatible. 
.NET Framework net461 was computed.  net462 is compatible.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (8)

Showing the top 5 NuGet packages that depend on Esprima:

Package Downloads

Javascript interpreter for .NET.


PlaywrightSharp is a .NET library to automate Chromium, Firefox and WebKit with a single API. Playwright is built to enable cross-browser web automation that is ever-green, capable, reliable and fast.


A C# library that allows for the consumption of source maps and the deminification of JavaScript stack traces.


Package Description


Javascript interpreter for .NET which provides full ECMA 5.1 compliance.

GitHub repositories (3)

Showing the top 3 popular GitHub repositories that depend on Esprima:

Repository Stars
Javascript Interpreter for .NET
The OpenBullet web testing application.
🔥🔥🔥 SmartSQL 是一款方便、快捷的数据库文档查询、导出工具!该工具从最初支持CHM文档格式开始,通过不断地探索开发、集思广益和不断改进,又陆续支持Word、Excel、PDF、Html、Xml、Json、MarkDown等文档格式的导出。同时支持SqlServer、MySql、PostgreSQL、SQLite等多种数据库的文档查询和导出功能。
Version Downloads Last updated
3.0.5 48,496 4/9/2024
3.0.4 211,507 12/31/2023
3.0.3 411 12/30/2023
3.0.2 87,837 11/4/2023
3.0.1 97,668 9/10/2023
3.0.0 910 9/3/2023
2.1.3 257,436 3/8/2022
2.1.2 288,703 1/2/2022
2.1.1 774 1/1/2022
2.1.0 2,178 12/20/2021
2.0.5 14,211 12/15/2021
2.0.4 1,948,719 12/1/2021
2.0.3 218,448 8/30/2021
2.0.2 87,026 7/18/2021
2.0.1 886 7/11/2021
2.0.0 522,470 5/19/2021
1.0.1270 511,344 3/10/2020
1.0.1258 53,780 2/28/2020
1.0.1251 222,009 10/26/2019
1.0.1246 140,066 10/16/2019