Schema Editor

Schema Editor

The Schema Editor lets you define the shape of records in your collection — what fields exist, what type of data each field generates, and how many sample records to create. MockLab uses the schema to auto-generate realistic data using the field name and type as hints.

Opening the Schema Editor

  1. Go to Mock API and click on a collection name.
  2. In the collection detail view, click the Schema tab.
  3. You'll see a table of current fields with type and sample value columns.

Supported field types

Type Auto-generated value Example output
id Unique prefixed ID "prod_4kX9z"
name Full person or product name "Wireless Headphones"
email Valid email address "[email protected]"
phone International phone number "+1 555-234-5678"
url Valid HTTPS URL "https://example.com"
price Decimal number (2dp) 49.99
integer Random integer 42
boolean true or false true
date ISO 8601 date "2024-11-03"
datetime ISO 8601 datetime "2024-11-03T14:22:00Z"
uuid RFC 4122 UUID v4 "a3f2c1d0-..."
text Short lorem-ipsum sentence "Lorem ipsum..."
enum Random value from your list "active"
object Nested object with child fields {"key": "value"}
array Array of 1–5 values of a type ["tag1", "tag2"]

Smart field name inference

MockLab infers the type from the field name automatically. You don't need to manually set types for common patterns: 

// Field name → inferred type
"id"          → id
"userId"      → id
"email"       → email
"createdAt"   → datetime
"updatedAt"   → datetime
"price"       → price
"amount"      → price
"isActive"    → boolean
"phoneNumber" → phone
"imageUrl"    → url
"description" → text

Regenerating records

After modifying the schema, click Regenerate to create a fresh set of sample records using the new schema. The previous records are discarded.

Regenerate replaces all existing records including ones you created via POST. On the Pro plan, manually created records are permanent — regenerate only if you want to reset.

Custom enum values

For enum type fields, you provide the list of possible values. MockLab picks randomly from this list for each generated record. 

// Schema definition for a "status" enum field
{
  "name": "status",
  "type": "enum",
  "values": ["active", "inactive", "pending", "suspended"]
}

// Generated records will have one of:
// "active", "inactive", "pending", or "suspended"
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