What is an Abstract Syntax Tree (AST)?

An AST is a hierarchical tree representation of source code structure used by compilers, linters (ESLint), and transpilers (Babel, TypeScript) to analyze and transform code without syntax ambiguity.

Which node types are inspected?

The explorer displays standard ESTree-compatible node types such as Program, FunctionDeclaration, VariableDeclaration, CallExpression, BinaryExpression, ObjectExpression, and Literal tokens.

Is my source code processed securely?

Yes. 100% of code tokenization and AST hierarchy generation runs locally inside your browser tab.

AST Explorer & Syntax Tree Inspector

Inspect the Abstract Syntax Tree (AST) structure of JavaScript and JSON code snippets. Explore compiler tokens, expression types, and collapsible scopes.

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Source Code (JavaScript / JSON) 0 tokens

Abstract Syntax Tree Ready

Frequently Asked Questions

What dialect and specification does the parser follow?

The parser targets the ESTree specification standard adopted by ESLint, Prettier, Babel, and Acorn, mapping program declarations, statements, and expressions.

How are syntax errors surfaced?

If invalid JavaScript or JSON is pasted, the parser catches the exact token collision or premature EOF and renders an informative error banner with line and column numbers.

Can I export the full AST as JSON?

Yes. Clicking "Copy AST (JSON)" copies the complete recursive tree representation to your clipboard.

Is my code sent across the network?

No. 100% of lexing and AST traversal execute client-side in your browser.