Online JSON & JSON5 Tools – Format, Validate & Convert Instantly

How It Works

Our online JSON & JSON5 tools provide a suite of functionalities to format, validate, convert, and manipulate JSON data. Below is a detailed description of each tool along with input and output examples.

1. Formatter

JSON Formatter: Parses and pretty-prints valid JSON with proper indentation.

Example Input:

{
  "name": "Alice",
  "age": 30,
  "city": "New York"
}

Example Output:

{
  "name": "Alice",
  "age": 30,
  "city": "New York"
}

JSON5 Formatter: Parses extended JSON5 syntax (supports comments, unquoted keys, and trailing commas) and outputs standard JSON.

Example Input:

{
  // Example JSON5 input
  key: 'value',
  number: Infinity,
  list: [1, 2, 3,],
  object: {
    nestedKey: 'nestedValue',
  },
}

Example Output:

{
  "key": "value",
  "number": null,
  "list": [
    1,
    2,
    3
  ],
  "object": {
    "nestedKey": "nestedValue"
  }
}

Minifier: Removes unnecessary whitespace from valid JSON/JSON5 to produce a compact string.

Example Input (JSON5):

{key:'value',number:Infinity,list:[1,2,3,],object:{nestedKey:'nestedValue'},}

Example Output:

{"key":"value","number":null,"list":[1,2,3],"object":{"nestedKey":"nestedValue"}}

Beautifier: Reformats compact JSON/JSON5 into a human-readable format with proper indentation.

Example Input (JSON5):

{key:'value',number:Infinity,list:[1,2,3,],object:{nestedKey:'nestedValue'},}

Example Output:

{
  "key": "value",
  "number": null,
  "list": [
    1,
    2,
    3
  ],
  "object": {
    "nestedKey": "nestedValue"
  }
}

2. Validator

JSON Validator: Checks your JSON input for syntax errors.

Example Input:

{
  "name": "Alice",
  "age": 30,
  "city": "New York"
}

Example Output: "Valid JSON!" (or an error message if invalid)

JSON5 Validator: Checks your input for valid JSON5 syntax.

Example Input:

{
  // JSON5 example
  key: 'value',
  list: [1, 2, 3,],
}

Example Output: "Valid JSON5!" (or an error message if invalid)

JSON Schema Validator: (MVP – not fully implemented) Intended to validate JSON data against a user-provided JSON Schema.

Example Input: JSON data and a JSON Schema.

Example Output: A message indicating that schema validation is not implemented.

3. Converter

XML to JSON: Converts XML data into a JSON object.

Example Input (XML):

<person>
  <name>Alice</name>
  <age>30</age>
</person>

Example Output (JSON):

{
  "person": {
    "name": "Alice",
    "age": "30"
  }
}

JSON to XML: Converts a JSON object into an XML structure.

Example Input (JSON):

{
  "person": {
    "name": "Alice",
    "age": 30
  }
}

Example Output (XML):

<person><name>Alice</name><age>30</age></person>

CSV to JSON: Converts CSV data into an array of JSON objects, using the first row as headers.

Example Input (CSV):

name,age
Alice,30
Bob,25

Example Output (JSON):

[
  {
    "name": "Alice",
    "age": "30"
  },
  {
    "name": "Bob",
    "age": "25"
  }
]

YAML to JSON / JSON to YAML: Converts data between YAML and JSON formats.

Example Input (YAML):

name: Alice
age: 30
city: New York

Example Output (JSON):

{
  "name": "Alice",
  "age": 30,
  "city": "New York"
}

Example Input (JSON):

{"name": "Alice", "age": 30, "city": "New York"}

Example Output (YAML):

name: Alice
age: 30
city: New York

JSON5 to JSON: Parses JSON5 input and converts it into standard JSON.

Example Input (JSON5):

{
  // JSON5 input example
  key: 'value',
  list: [1, 2, 3,],
}

Example Output (JSON):

{
  "key": "value",
  "list": [
    1,
    2,
    3
  ]
}

JSON to TypeScript Interface: Generates a TypeScript interface based on the structure of a JSON object.

Example Input (JSON):

{
  "name": "Alice",
  "age": 30
}

Example Output (TypeScript):

interface RootObject {
  name: string;
  age: number;
}

JSON to Python Dictionary: Converts a JSON object into a Python dictionary representation.

Example Input (JSON):

{
  "name": "Alice",
  "age": 30
}

Example Output (Python):

{
    'name': 'Alice',
    'age': 30
}

GraphQL to JSON: (MVP – not fully implemented) Intended to convert GraphQL responses into JSON format.

Example Input: A GraphQL query response.

Example Output: A message indicating that conversion is not implemented.

4. Developer Tools

JSON Diff: Compares two JSON objects by formatting them with proper indentation, splitting them into lines, and then comparing each line. Unchanged lines are prefixed with " ", lines removed from the first input are prefixed with "- ", and lines added in the second input are prefixed with "+ ".

Example Input JSON 1:

{
  "name": "Alice",
  "age": 100
}

Example Input JSON 2:

{
  "name": "Alice",
  "age": 200
}

Example Output (Diff):

  {
    "name": "Alice",
-   "age": 100
+   "age": 200
  }

JSON Merge: Deeply merges two JSON objects. For keys present in both objects, if both values are objects, they are merged recursively; otherwise, the value from the second object overrides the first.

Example Input JSON 1:

{
  "name": "Alice",
  "details": {
    "age": 30,
    "city": "New York"
  }
}

Example Input JSON 2:

{
  "details": {
    "age": 35,
    "country": "USA"
  },
  "active": true
}

Example Output (Merged JSON):

{
  "name": "Alice",
  "details": {
    "age": 35,
    "city": "New York",
    "country": "USA"
  },
  "active": true
}

REST API JSON Formatter: Fetches JSON data from a specified API endpoint and formats it with proper indentation.

Example Input: A valid API endpoint URL that returns JSON.

Example Output: The formatted JSON response from the API.

JWT Decoder: Decodes the payload of a JWT token so that you can inspect its contents.

Example Input (JWT): A valid JWT token string.

Example Output (Decoded Payload):

{
  "sub": "1234567890",
  "name": "Alice",
  "iat": 1516239022
}