Open source · Multi-language

Understand any code at a glance.

Paste code and get an interactive call graph. Multi-language via Tree-sitter.

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Supports:PythonJavaScriptTypeScriptGoRustSQL

How it works

01
Paste your code
Pick a language and drop in a snippet — no setup, no upload.
02
Tree-sitter parses it
A real syntax tree is built on the server, fast and language-agnostic.
03
Explore the call graph
Pan, zoom and follow how functions call each other.

Built to read code

Multi-language

One parsing engine, many languages. Powered by Tree-sitter.

PythonJavaScriptTypeScriptGoRustSQL

+More languages coming soon

Interactive diagrams

Pan, zoom and explore the call graph of your code.

Pluggable

Add a new language in just a few lines. Built to extend.

Accurate parsing

Real syntax trees via Tree-sitter, not fragile regex.

No setup

Paste a snippet and visualize. Nothing to install.

Open source

Free, MIT-licensed, and community-driven.

See it in action

Call graph

Functions become nodes and calls become arrows — traced across files.

posts

PKidint

FKauthor_idint

1:N

users

PKidint

emailtext

SQL schema

Tables become entities and foreign keys become relationships with cardinality.

Languages

Six today — five produce a call graph, SQL produces an ER diagram.

PythonCall graphFunctions, classes, imports, inheritance
JavaScriptCall graphFunctions, arrow fns, classes, ES imports
TypeScriptCall graphSame as JS, with the typed grammar
GoCall graphFunctions and methods (no classes)
RustCall graphFunctions and calls
SQLER diagramTables, columns, PK/FK, relationships

Where it helps

Onboard to a new codebase

Get the lay of the land before reading line by line.

Review changes faster

See how a function connects before approving a PR.

Teach and document

Turn code into a diagram for explanations and docs.

Explore unfamiliar code

Drop in a snippet or file and trace the flow.

FAQ

Does my code leave my machine?

It's sent to the server to be parsed with Tree-sitter, then discarded — nothing is stored.

Is there a size limit?

Up to 2 MB and 400 files per analysis.

Which languages are supported?

Python, JavaScript, TypeScript, Go, Rust and SQL — with more on the way.

Is it free and open source?

Yes, MIT-licensed. Contributions — especially new languages — are welcome.

What people say

Experiences from people using Weftmap.

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Map your code now

Paste a snippet and get an interactive diagram in seconds.

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Open source · MIT

Built to be extended. Star it or pick up a good first issue.

Star on GitHub +Good first issues