How are numbers typed?

All JSON numbers map to Number — Mongoose does not distinguish integers from floats. Use a custom validator if you need integer-only paths.

What happens with null or empty arrays?

null maps to Schema.Types.Mixed and empty arrays to [Schema.Types.Mixed], since their type can't be inferred from the sample.

How are nested objects handled?

Nested objects are inlined as nested path definitions (subdocuments). An empty object becomes {}.

Is my JSON sent anywhere?

No. Conversion happens entirely in your browser; nothing is uploaded.

JSON to Mongoose Schema Generator

Paste any JSON object and get a ready-to-use Mongoose `Schema` with paths mapped to schema types (String, Number, Boolean, arrays) and nested objects inlined as subdocuments. A model export is included. Everything runs locally in your browser — your JSON is never uploaded.

—

Model nameJSON input

Mongoose schema

const mongoose = require('mongoose');
const { Schema } = mongoose;

const autoGeneratedSchema = new Schema({
  name: String,
  age: Number,
  active: Boolean,
  tags: [String],
  meta: {
    id: String,
  },
});

module.exports = mongoose.model('AutoGenerated', autoGeneratedSchema);

How to use

Paste or type your JSON into the input box.
Optionally rename the model (defaults to AutoGenerated).
Copy the generated schema from the output box.

Frequently asked questions

How are numbers typed?: All JSON numbers map to Number — Mongoose does not distinguish integers from floats. Use a custom validator if you need integer-only paths.
What happens with null or empty arrays?: null maps to Schema.Types.Mixed and empty arrays to [Schema.Types.Mixed], since their type can't be inferred from the sample.
How are nested objects handled?: Nested objects are inlined as nested path definitions (subdocuments). An empty object becomes {}.
Is my JSON sent anywhere?: No. Conversion happens entirely in your browser; nothing is uploaded.

Related tools

JSON → TypeScript Interface

Generate TypeScript interfaces from any JSON sample — types are inferred recursively and named after each key.

Developer 0 0

JSON to Zod Schema Generator

Turn a JSON object into a Zod validation schema with inferred types, in your browser.

Developer 0 0

JSON to GraphQL Schema (SDL) Converter

Turn a JSON object into GraphQL type definitions (SDL) with scalar mapping, in your browser.

Developer 0 0

JSON to Protobuf Schema Converter (proto3)

Turn a JSON object into a proto3 .proto schema with typed fields and nested messages, in your browser.

Developer 0 0

JSON Schema Generator

Paste any JSON and get a draft-07 JSON Schema that matches its shape — types inferred, formats detected, required fields filled in.

Developer 0 0

JSON to JSDoc @typedef Generator

Turn a JSON object into JSDoc @typedef blocks with @property tags, in your browser.

Developer 0 0