HAR Viewer
View and analyze HTTP Archive (HAR) files
About the HAR Viewer
A HAR file is a complete recording of the network activity your browser captured — every request, its timing, and its response — but opened as raw JSON it is an unreadable wall of text. HAR Viewer parses that file and lays out a clean summary: how many requests were made, and for each one its method, URL, and response status.
It is the tool you open when someone sends you a HAR export to debug a problem: a support engineer scanning which requests failed, a developer confirming the order calls fired in, or a tester verifying a 401 really did come back from the API. Upload the file or paste its contents and the noise becomes a readable list.
How to Use the HAR Viewer
- Upload a .har file with the "Upload HAR" button, or paste its JSON contents into the text box.
- The tool parses it and shows a summary: HAR version, number of entries, and number of pages.
- Scan the request list — each row shows the HTTP method, the URL, and the response status.
- Use Copy to export the parsed data as formatted JSON for sharing or further inspection.
Why Use ToolForge’s HAR Viewer
- It accepts both file upload and pasted content, so you can open a HAR however it reached you.
- It surfaces the details that matter for debugging — method, URL, and response status per request — instead of making you scroll raw JSON.
- It validates that the file is a real HAR (checking for the log structure) and reports a clear error if it is not.
- Parsing happens entirely in your browser, which matters because HAR files often contain sensitive headers, cookies, and tokens that should never be uploaded.
Frequently Asked Questions
What is a HAR file and how do I create one?
A HAR (HTTP Archive) file is a JSON record of a browser session's network requests. You generate one from your browser's developer tools — in the Network tab, record activity and choose "Save all as HAR" (or "Export HAR"). The resulting file captures every request and response.
Is it safe to open a HAR file here?
Yes — the file is parsed locally in your browser and never uploaded. This is important because HAR files frequently contain authentication headers, cookies, and other sensitive data, so keeping the parsing client-side protects that information.
Why does it only show some of the requests?
For readability, the viewer lists the first batch of entries and indicates how many more exist, since real HAR files can contain hundreds of requests. The summary count tells you the total number of entries captured.
