API Response JSON Viewer
Test REST APIs, paste raw JSON, or upload files. Inspect the resulting data in a beautiful, searchable tree — all in your browser.
Request Headers (1)
Ready when you are
Enter an API endpoint above and click Send to inspect the JSON response in a structured tree view.
Why Developers Love Our API Response Viewer
A focused, no-signup alternative to heavy desktop API clients — purpose-built for inspecting REST responses fast.
Multiple Input Modes
Easily switch between making API requests, pasting JSON text directly, or uploading local .json files in one click.
Interactive JSON Tree
Drill into nested arrays and objects with expand/collapse, value highlighting, and a property grid inspector for the selected node.
100% Private
Every request is made directly from your browser. We never see your URLs, tokens, headers or response payloads.
Search Inside Responses
Find any key or value in deeply nested API payloads with next/previous navigation and live highlighting.
Headers & Body Builder
Add any number of custom headers, pass bearer tokens, and send JSON request bodies for POST, PUT and PATCH calls.
Copy & Export
Copy the formatted response to your clipboard or download it as a .json file to attach to bug reports.
About the API Response JSON Viewer
The API Response JSON Viewer is a versatile online developer tool that handles all your JSON needs. Whether you want to call a REST endpoint, paste in a clipboard snippet, or load an exported configuration file, this tool instantly visualizes the data in a clean, interactive tree.
Compose API requests with custom headers and bodies to see live response timings. Or, quickly paste raw text to format and explore it. Our built-in property grid and advanced search make it a breeze to navigate deep data structures.
{
"id": 1,
"name": "Leanne Graham",
"address": {...},
"company": {...}
}
No Signup, No Limits
Send unlimited requests without creating an account.
Bearer Token Support
Add Authorization headers to test protected endpoints.
Status & Timing
See exact status code, response time and payload size.
Pretty + Raw Views
Switch between formatted tree, headers, and raw text.
Your Ultimate JSON Workspace
Whether you're building a frontend against a brand-new backend, validating a webhook payload, or inspecting exported log files, the API Response JSON Viewer gives you a fast, private workspace. No downloads. No accounts. No data ever leaves your machine when pasting or uploading.
How to Use the API Response Viewer
Load your data from anywhere in seconds.
Select Input Mode
Choose API Request to fetch data online, Paste JSON to insert raw text, or Upload File for local data.
Provide & Process
Configure your API endpoint and send, drop your file, or paste your text and hit Process.
Explore the Data
Browse the structured response in the interactive tree, search for keys/values, or export the payload.
Built for Real Developer Workflows
Designed for the everyday tasks you actually do.
REST API Debugging
Verify that an endpoint returns the JSON shape you expect with live status codes.
Format Pasted JSON
Take an unreadable block of JSON text, paste it in, and instantly view a beautifully structured tree.
Inspect File Exports
Upload large JSON data dumps or configuration files directly from your computer.
Webhook Payload Inspection
Paste a webhook URL or replay a request to understand the body before writing handlers.
Microservice Health Checks
Hit internal services and confirm shape, latency, and headers in seconds.
Documentation & Bug Reports
Copy or download responses to share precise examples in tickets and PRs.
Frequently Asked Questions
Everything about testing API responses with our online viewer.
What can I do with this API Response JSON Viewer?+
This tool allows you to input JSON data in three ways: you can send an HTTP request to an API endpoint, paste raw JSON text directly, or upload a .json file. It then visualizes the data in a structured, collapsible tree where you can search through keys and values.
Which HTTP methods are supported for API requests?+
Our tool supports the most common REST methods: GET, POST, PUT, PATCH, and DELETE. You can attach custom headers to every request and provide a JSON body for POST, PUT, and PATCH calls.
Is my API key or token sent to your server?+
No. The entire request is fired directly from your browser to the target API. We never proxy, log, or store your URLs, headers, tokens, or response bodies. Everything stays client-side.
Why do I get a CORS error on some APIs?+
Browsers enforce a Cross-Origin Resource Sharing policy. If the target API does not include the appropriate Access-Control-Allow-Origin headers, the browser blocks the response. Test against APIs that allow CORS, use a public CORS-friendly endpoint, or run the call from your own backend.
Can I save or share an API response?+
Yes. Once you receive a response, you can copy it to the clipboard or download the body as a .json file with one click.
Is this tool really free?+
Yes, the API Response JSON Viewer is completely free with no signup, ads, or rate limits. It is designed for developers who want to inspect REST responses quickly.