JSON2Mermaid Lite｜Usage Guide

1. Purpose

JSON2Mermaid Lite converts pasted JSON into Mermaid.js flowchart TD syntax.

You can copy the generated code into Mermaid-compatible Markdown or Mermaid Live Editor to inspect the structure visually.

2. How to Use

• Paste JSON into the input area.
• Use a preset if you want to try a sample.
• Click “Convert”.
• Copy the generated Mermaid syntax, or save it as .mmd / .txt.
• Paste it into a Mermaid-compatible tool when you want to preview the diagram.

3. Supported / Unsupported

Supported

• Standard JSON objects
• Arrays
• Strings / numbers / booleans / null
• Nested structures up to 12 levels deep

Limits and unsupported cases

• The input limit is 300KB.
• The depth limit is 12 levels. Deeper branches are shown as omitted.
• Arrays are expanded up to 50 items. Extra items are replaced with an omitted-items node.
• Invalid JSON text cannot be converted.
• This page does not preview the Mermaid diagram directly.

4. Error Handling

If the JSON has a syntax error, the tool shows an approximate line and column.

If your input is over 300KB, split it into smaller pieces before converting.

5. Output Format

The output is Mermaid.js flowchart TD syntax.

flowchart TD
  node_0["root"]
  node_1["user"]
  node_0 --> node_1
  node_2["name"]
  node_1 --> node_2

6. Using Mermaid Live Editor

You can preview the generated code in external tools such as Mermaid Live Editor.

When you paste code into an external site, that site handles the content. Do not paste confidential JSON or code generated from confidential JSON.

7. FAQ

Q. Is my data sent to a server?

A. The conversion itself runs in your browser. This page may still load ad and analytics tags.

Q. Can it convert large JSON?

A. The current limit is 300KB. Split large JSON before converting.

Q. Are all array items displayed?

A. Arrays are expanded up to 50 items. Additional items are omitted.

8. Disclaimer

Diagram completeness and readability are not guaranteed. Always review generated output manually for important structures.