JSON to Mongoose Schema Converter
Paste a JSON sample to instantly generate a matching Mongoose Schema definition for MongoDB, with nested sub-documents and required fields inferred automatically. Free online developer tool.
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Mongoose Schema
Mongoose schema definition will appear here...
Free JSON to Mongoose Schema Converter
Paste a JSON sample to instantly generate a matching Mongoose Schema definition for MongoDB. Nested objects are described inline, arrays map to array field definitions, and fields that are present in every sample are marked required: true automatically.
How to Use It
Paste any JSON object into the input box, or click "Load Example" to see a sample run. The converter parses your JSON, infers a field shape from the values it finds, and generates a singlenew mongoose.Schema({...}) call with nested objects described inline as sub-documents.
Example
Given {"name": "Ann", "createdAt": "2024-01-15T10:00:00Z", "tags": ["a","b"], "address": {"city": "NYC"}}, the tool maps name to { type: String, required: true }, detects the ISO-8601-looking string in createdAt and maps it to Date, mapstags to [String], and describes address as an inline nested schema object.
Common Use Cases
- Bootstrapping a Mongoose model for a new Express/MongoDB API from a sample payload.
- Converting a REST API response shape into a matching MongoDB collection schema.
- Getting a starting point for required fields based on what's always present in your data.
- Speeding up backend scaffolding for Node.js projects that use Mongoose as their ODM.
FAQs
How does the tool decide a string should be a Date?
If a string value in your sample looks like an ISO-8601 timestamp (for example2024-01-15T10:00:00Z), the field is mapped to Mongoose's Date type instead of String. Ordinary strings always map to String.
What type is used for fields with mixed or unknown types?
Fields whose type can't be confidently inferred fall back tomongoose.Schema.Types.Mixed, Mongoose's catch-all type for arbitrary values.
Is my JSON uploaded anywhere?
No — parsing and schema generation happen entirely client-side in your browser. Nothing you paste is sent to a server.