Yes! All processing happens locally in your browser. We never send your data to any server. Your privacy is our top priority.

Absolutely. DevWallah is and will always be free to use for developers.

JSON Schema Validator

Validate a JSON document against a JSON Schema to check its structure.

Examples

JSON Schema

Draft 07

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "User",
  "type": "object",
  "required": [
    "id",
    "name",
    "email"
  ],
  "properties": {
    "id": {
      "type": "integer",
      "minimum": 1,
      "description": "Unique user ID"
    },
    "name": {
      "type": "string",
      "minLength": 2,
      "maxLength": 100
    },
    "email": {
      "type": "string",
      "format": "email"
    },
    "age": {
      "type": "integer",
      "minimum": 0,
      "maximum": 150
    },
    "role": {
      "type": "string",
      "enum": [
        "admin",
        "editor",
        "viewer"
      ]
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "uniqueItems": true
    },
    "address": {
      "type": "object",
      "properties": {
        "street": {
          "type": "string"
        },
        "city": {
          "type": "string"
        },
        "zip": {
          "type": "string",
          "pattern": "^\\d{5}$"
        }
      },
      "required": [
        "city"
      ]
    }
  },
  "additionalProperties": false
}

JSON Data to Validate

✓ Valid — JSON matches the schema perfectly

Draft: Draft 07Properties: 7Schema: UserData keys: 7

No errors — your data is perfectly valid!

JSON Schema Keyword Reference

type

required

Array of property names that must be present

properties

Define sub-schemas for object properties

additionalProperties

Allow or restrict extra properties (false = strict)

minLength / maxLength

String character length constraints

minimum / maximum

Numeric value bounds (inclusive)

exclusiveMinimum / exclusiveMaximum

Numeric bounds (exclusive)

pattern

Regex pattern the string must match

format

email, date, date-time, uri, uuid, ipv4, ipv6, …

enum

Value must be one of the listed options

items

Schema for array elements

minItems / maxItems

Array length constraints

uniqueItems

Array elements must be distinct (true/false)

allOf

Must satisfy ALL listed sub-schemas

anyOf

Must satisfy AT LEAST ONE sub-schema

oneOf

Must satisfy EXACTLY ONE sub-schema

not

Must NOT match the given sub-schema

$ref

Reference another schema definition

How to use JSON Schema Validator

This json schema validator is designed to be blazingly fast and 100% secure. Everything runs inside your browser sandbox.

01 Input your data in the provided text area.
02 The tool will automatically process your input in real-time.
03 Check the output section for the results.
04 Use the copy button to save the result.

FAQ

Is my data safe?

Yes. All processing happens locally in your browser leveraging WebAssembly or standard JS. We never send your data to any server. Your privacy is structurally guaranteed.

Is this tool free?

Absolutely. DevWallah is built by developers, for developers, and will always be free to use.

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