Visualise any JSON structure as a mind map
JSON is a tree. Mind maps are trees. Drop a JSON file into SpawnGraph and it renders the nested structure as a navigable visual map — keys become branch labels, nested objects become sub-branches, arrays expand as siblings, scalar values land at the leaves. It is the fastest way to understand the shape of an API response, a config file, or any nested data structure you have never seen before.
How it works
- 1Drop the file or paste the JSON. Drag a .json file onto the canvas, pick it with the file picker, or paste raw JSON text directly — copied from your browser, Postman, a terminal, or anywhere else.
- 2The hierarchy renders as a map. Keys become branch labels. Nested objects become sub-branches at the next depth level. Arrays expand each element as a sibling node. Strings, numbers, and booleans appear at the leaves.
- 3Collapse, zoom, annotate. Collapse deep subtrees to focus on the structure you care about. Annotate unexpected fields. Share the map with a teammate who needs to understand the same data schema.
Who uses this
Developers who just got access to a new API and want to understand the response schema without writing code to walk the structure. Data analysts exploring a JSON export from a database or analytics tool. Frontend engineers mapping out a complex API response before writing the component that consumes it. Backend engineers documenting a config file format for a colleague. Anyone who has stared at a deeply nested JSON blob in a text editor and thought "there must be a better way to see this" — there is.
JSON is already a tree — SpawnGraph just draws it
Every JSON object is a hierarchy. The problem is that text editors and JSON viewers show it linearly with indentation, which makes it hard to grasp the full shape at a glance when nesting goes beyond three or four levels. SpawnGraph maps the structural relationships spatially — the root object at the center, top-level keys as the first ring of branches, nested objects expanding outward. You can see at a glance which parts of the structure are deep, which keys are sparse, and where the data actually lives.
Works with API responses, configs, and data exports
Copy a response from the browser DevTools Network panel and paste it into SpawnGraph. Drop a package.json, tsconfig.json, or docker-compose config. Import a JSON export from Notion, Airtable, or any tool that lets you export data. The format does not matter as long as it is valid JSON — SpawnGraph parses it and gives you the map.
Sensitive API responses stay private
API responses often contain credentials, user data, or internal IDs that should not be shared outside your machine. SpawnGraph parses JSON entirely in-browser using the File API and the clipboard API. Nothing is uploaded to a server. You can verify this with DevTools → Network while parsing — no outbound request is made.
In short: SpawnGraph maps JSON's nested key-value structure directly to a visual mind map hierarchy. Drop a file or paste the text. Runs entirely in-browser. Free, no signup, nothing uploaded.