JavaScript AST Parser
Paste JavaScript code to break it down into readable components — with a field-by-field breakdown and, where relevant, its structure tree. Everything is processed on your device.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
const add = (a, b) => a + b;
Example Output
AST tree + node counts
How to Use
- 1Paste the JavaScript code you want to parse into the input box.
- 2If the tool asks for an extra field (e.g. a JSON Pointer or JSONPath), fill it too.
- 3Click Parse (or press Ctrl+Enter).
- 4See the component breakdown in the Components tab, the tree structure in the Tree tab (when available), and the normalized JSON in the JSON tab. Click Copy to copy the JSON.
About JavaScript AST Parser
JavaScript AST Parser turns JavaScript code into an Abstract Syntax Tree (AST) — a tree representation of its syntactic structure. You can explore each node (functions, expressions, declarations) and see the count of each node type.
Parsing uses acorn, a fast, standards-compliant ECMAScript parser, loaded on demand. Useful for learning how parsers work, building tools, or analyzing code.
FAQ
Is my data sent to a server?
No. The entire parsing is done in your browser with JavaScript. Nothing is uploaded, logged, or stored on our servers — safe for sensitive data.
How is this parser different from a validator or formatter?
A parser turns raw input into its component structure so you can see its building blocks (and, for code, its AST/DOM tree). A validator only checks valid/invalid, and a formatter just tidies the layout. A parser focuses on "what it contains and how it is structured".