JSON to ER diagram

JSON to ER Diagram (Mermaid and DBML)

Turn a JSON sample into an entity-relationship diagram. Every kind of object becomes an entity with its fields and types; a nested object becomes a one-to-one link and an array of objects a one-to-many link. Mermaid renders in GitHub, GitLab and Notion, and DBML opens in dbdiagram.io.

How do I use the JSON to ER diagram?

1. Paste JSON, such as an API response.
2. Pick Mermaid or DBML and name the root entity.
3. Paste the Mermaid code into a ```mermaid block, or the DBML into dbdiagram.io.

What does the JSON to ER diagram do?

• Mermaid erDiagram with PK on id fields and optional fields marked
• DBML tables in plural snake_case with keys and refs
• One-to-one and one-to-many links from nested objects and arrays
• Keys that aren't valid names are renamed, with the original kept in a comment

Frequently asked questions

Where can I see the diagram?

Mermaid draws it in GitHub and GitLab Markdown, Notion and many docs tools. DBML draws it in dbdiagram.io.

Is my data uploaded?

No. Bracely runs entirely in your browser, so nothing you paste or open leaves your device.

More JSON tools

Bracely has more than 65 JSON tools in one page. Related ones:

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• JSON Schema Generator
• JSON to Go
• JSON to Java
• JSON to C#
• JSON to Python
• JSON to Kotlin
• JSON to Swift
• JSON to Dart
• JSON to Rust
• JSON to PHP
• JSON to Zod
• JSON to GraphQL
• JSON to Protobuf
• YAML to JSON
• CSV to JSON
• Mock JSON generator
• UUID generator
• JSON Formatter
• JSON Validator
• JSON Viewer
• JSON Repair
• JSON Diff
• JSON to YAML
• JSON to CSV
• jq Playground

Runs entirely in your browser. Nothing you paste is uploaded. Made by Saurabh Pagrut. About · Privacy policy
Last updated 20 October 2026 · Version 2.1 · Changelog
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