REST API Tester Free Online Tool 2026

Last updated March 22, 2026

GET Request

Fetch a list of users from a REST API:

Method: GET
URL: https://api.example.com/users?page=1&limit=10

Headers:
  Accept: application/json
  Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...

Response (200 OK):
{
  "data": [
    { "id": 1, "name": "Sarah Bennett", "email": "sarah@example.com" },
    { "id": 2, "name": "Marcus Webb", "email": "marcus@example.com" }
  ],
  "total": 42,
  "page": 1,
  "limit": 10
}

POST Request with JSON Body

Create a new resource:

Method: POST
URL: https://api.example.com/users
Headers:
  Content-Type: application/json
  Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...

Body:
{
  "name": "Priya Sharma",
  "email": "priya@example.com",
  "role": "user"
}

Response (201 Created):
{
  "id": 43,
  "name": "Priya Sharma",
  "email": "priya@example.com",
  "role": "user",
  "createdAt": "2026-03-17T14:23:01Z"
}

Basic Authentication

Authenticate with username and password:

Method: GET
URL: https://api.example.com/protected
Auth type: Basic Auth
Username: admin
Password: secret123

Generated header:
  Authorization: Basic YWRtaW46c2VjcmV0MTIz

Bearer Token Authentication

Method: GET
URL: https://api.example.com/profile
Auth type: Bearer Token
Token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMDAxIn0.abc123

Generated header:
  Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...

API Key Authentication

Method: GET
URL: https://api.example.com/data
Auth type: API Key
Key name: X-API-Key
Key value: sk_live_aK7mPx3nQr9wLt2v

Generated header:
  X-API-Key: sk_live_aK7mPx3nQr9wLt2v

Or as a query parameter:
  https://api.example.com/data?api_key=sk_live_aK7mPx3nQr9wLt2v

Environment Variables

Define variables to reuse across requests:

Environment: Development
Variables:
  BASE_URL = https://dev-api.example.com
  API_KEY  = sk_test_aK7mPx3nQr9wLt2v
  USER_ID  = 1001

Usage in requests:
  URL: {{BASE_URL}}/users/{{USER_ID}}
  Header: X-API-Key: {{API_KEY}}

Switch to Production environment:
  BASE_URL = https://api.example.com
  API_KEY  = sk_live_BcDeFgHiJkLmNoP

Generated Code Snippets

The tester generates equivalent code for the same request in multiple languages:

JavaScript (fetch):
  const response = await fetch('https://api.example.com/users', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Authorization': 'Bearer TOKEN'
    },
    body: JSON.stringify({ name: 'Priya Sharma', email: 'priya@example.com' })
  });

Python (requests):
  import requests
  response = requests.post(
    'https://api.example.com/users',
    headers={'Authorization': 'Bearer TOKEN'},
    json={'name': 'Priya Sharma', 'email': 'priya@example.com'}
  )

curl:
  curl -X POST https://api.example.com/users \
    -H "Content-Type: application/json" \
    -H "Authorization: Bearer TOKEN" \
    -d '{"name":"Priya Sharma","email":"priya@example.com"}'

Test Script — Automated Assertions

Write test scripts that run after the response is received:

// Test script (runs after response)
const response = pm.response;

// Assert status code
pm.test("Status is 201", () => {
  pm.expect(response.status).to.equal(201);
});

// Assert response body
pm.test("User has an ID", () => {
  const body = response.json();
  pm.expect(body.id).to.be.a('number');
});

// Save ID for use in next request
pm.environment.set("NEW_USER_ID", response.json().id);

GraphQL Request

Method: POST
URL: https://api.example.com/graphql
Headers:
  Content-Type: application/json

Body:
{
  "query": "query GetUser($id: ID!) { user(id: $id) { name email role } }",
  "variables": { "id": "1001" }
}

Response:
{
  "data": {
    "user": { "name": "Sarah Bennett", "email": "sarah@example.com", "role": "admin" }
  }
}

• Send GET, POST, PUT, PATCH, DELETE, and other HTTP methods
• Configure headers, query parameters, and request bodies
• Basic auth, Bearer token, and API key authentication
• Environment variables for switching between dev/staging/production
• Pre-request and test scripts for automated assertions
• Generate code snippets in JavaScript, Python, curl, and more
• GraphQL query support with variables
• Request history and saved request collections

Method: PUT
URL: https://api.example.com/users/43
Headers:
  Content-Type: application/json

Body:
{
  "name": "Priya Sharma",
  "email": "priya.sharma@example.com",
  "role": "admin"
}

Response (200 OK):
{ "id": 43, "name": "Priya Sharma", "email": "priya.sharma@example.com", "role": "admin" }

Method: PATCH
URL: https://api.example.com/users/43
Headers:
  Content-Type: application/json

Body:
{ "role": "admin" }

Response (200 OK):
{ "id": 43, "name": "Priya Sharma", "email": "priya@example.com", "role": "admin" }

Method: DELETE
URL: https://api.example.com/users/43
Headers:
  Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...

Response (204 No Content):
  [empty body]