Request Builder helps you test and debug APIs quickly and accurately, right in your browser. Whether you need to build http requests interactively and generate code snippets in multiple languages, this tool eliminatesintegration bugs, incorrect request formats, and protocol errors by giving you instant, reliable results. Every operation runs locally on your device — nothing is uploaded to any server, so your data stays completely private.
Key Features
Visual Builder
Build requests with form fields for URL, method, headers, body, and params.
Multi-Language
Generate code for fetch, axios, curl, Python requests, and more.
Auth Support
Basic auth, Bearer token, API key header generation.
One-Click Copy
Copy generated code snippets directly to clipboard.
Common Use Cases
- Generate fetch or axios code snippets for quick integration into web apps
- Build authenticated API requests with Bearer tokens or API keys
- Convert visual request configurations into production-ready code
Request Builder
Build HTTP requests interactively and generate code snippets in multiple languages.
fetch(class="hljs-string">"https://api.example.com/data", {
method: class="hljs-string">"GET",
headers: {
class="hljs-string">"Content-Type": class="hljs-string">"application/json",
class="hljs-string">"Authorization": class="hljs-string">"Bearer token"
},
})
.then(res => res.json())
.then(data => console.log(data))Frequently Asked Questions
What is Request Builder?
Request Builder is an online API utility that build http requests interactively and generate code snippets in multiple languages. Features include Visual Builder, Multi-Language, Auth Support. Requests are made directly from your browser, with full visibility into headers, status codes, and response bodies.
Testing APIs typically involves dedicated desktop applications or command-line tools that can be cumbersome to set up. Request Builder provides a lightweight browser-based alternative that requires no installation or configuration. Each request is transparent — you see exactly what is sent and received — making it ideal for quick debugging, exploring new endpoints, or demonstrating API behavior to team members.
Frequently Asked Questions
What languages can I generate code for?
JavaScript (fetch, axios), Python (requests), cURL, Go, and Rust are currently supported. More languages are planned.
Can I set custom headers and auth?
Yes. Add custom headers, query parameters, and request body. Auth options include Basic Auth, Bearer Token, and API Key headers.
How does the visual builder work?
Fill in the URL, select the HTTP method, add headers and body using form fields. The tool generates ready-to-use code snippets in your chosen language.
Is my request data sent to a server?
No. All request building and code generation happens locally in your browser.
How does the Visual Builder feature work?
The Visual Builder feature build requests with form fields for url, method, headers, body, and params. It is designed to be intuitive and responsive, giving you immediate feedback as you interact with the tool. All processing happens locally in your browser.
What is the benefit of multi-language?
Multi-Language generate code for fetch, axios, curl, python requests, and more. This capability sets Request Builder apart from basic alternatives by providing more comprehensive functionality while maintaining the privacy and speed of local processing.
Is Request Builder really free to use?
Yes, Request Builder is completely free with no hidden charges, no sign-up requirements, and no usage limits. You can use it as often as you need, for any purpose — personal projects, commercial work, or educational use. There are no premium tiers or paid features.
Does Request Builder work on mobile devices?
Yes, it works on any device with a modern web browser — desktop, tablet, or phone. The interface is responsive and adapts to your screen size. Since all processing is done locally, you get the same performance regardless of your device.
What happens to my data when I use Request Builder?
Your data never leaves your device. Every operation is performed locally in your browser using JavaScript. No information is uploaded, stored, logged, or shared with any server. This privacy-first approach means you can work with sensitive data — passwords, API keys, personal information — without any risk of exposure.
Key Features
Visual Builder
Build requests with form fields for URL, method, headers, body, and params.
Multi-Language
Generate code for fetch, axios, curl, Python requests, and more.
Auth Support
Basic auth, Bearer token, API key header generation.
One-Click Copy
Copy generated code snippets directly to clipboard.
Common Use Cases
Request Builder is useful in a variety of scenarios across different workflows:
Generate fetch or axios code snippets for quick integration into web apps
Build authenticated API requests with Bearer tokens or API keys
Convert visual request configurations into production-ready code
Tips & Best Practices
Generate language-specific code
Use the multi-language export to generate code in JavaScript, Python, Go, and Rust — perfect for teams using different stacks.
Test auth headers visually
Build requests with different auth types (Basic, Bearer, API Key) visually before committing to code implementation.
Related Tools
Explore more api tools to enhance your workflow:
REST API Client
Send HTTP requests (GET, POST, PUT, DELETE) and inspect responses from your browser.
curl to Fetch Converter
Convert curl commands to JavaScript fetch, Python requests, and more.
HTTP Status Code Reference
Searchable reference of all HTTP status codes with descriptions and use cases.
WebSocket Tester
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OpenAPI Validator
Validate OpenAPI 3.x and Swagger 2.0 specifications for correctness.
Mock API Generator
Generate mock API responses from JSON schemas for rapid development.
Related Guides & Articles
Deepen your knowledge with these api guides and tutorials:
Common Errors & Fixes
Learn how to fix common errors related to Request Builder:
400 Bad Request Error
Learn what 400 Bad Request means, common causes like malformed syntax or invalid request parameters, and how to fix them.
422 Unprocessable Entity Error
Learn what 422 Unprocessable Entity means for API validation errors, how it differs from 400, and how to fix validation failures.
CORS Policy Blocked Request
Learn how to fix 'CORS policy: No Access-Control-Allow-Origin header' errors. Understand how CORS works and how to configure it correctly.