Convert Base64 to JSON
Decode Base64 back to JSON data. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use Convert Base64 to JSON
- 1. Paste the Base64 string. Paste the Base64 or Base64URL text you want decoded, such as a token segment or an encoded URL parameter. The tool decodes it back into raw JSON text.
- 2. Toggle prettifying the result. Turn on Prettify output to indent the decoded JSON for readability, or leave it off to see the exact minified text that was originally encoded.
- 3. Copy the decoded JSON. Copy the recovered JSON and inspect it directly, or paste it into another tool to explore the data further, now that it is back in plain, readable form.
When to use Convert Base64 to JSON
Convert Base64 to JSON reverses Base64 or Base64URL encoding to reveal the JSON document hiding underneath, the way atob works in a browser. It is for any time JSON data was encoded to travel safely through a URL, a token or a binary-unsafe field.
- Inspecting a JWT payload. You copied the middle segment of a JSON Web Token from an Authorization header and want to see the actual claims it contains without writing a decoder yourself.
- Reading state encoded in a URL parameter. A link contains a Base64-encoded query parameter that holds filter settings or session data, and you want to see the underlying JSON before trusting or modifying it.
- Decoding a data URI's embedded JSON. An HTML attribute or config file contains a data URI wrapping a JSON payload, and you need to extract and read the actual structured content inside it.
- Debugging an encoded field from a legacy API. An older API returns a field as a Base64 string instead of nested JSON, and you need to decode it to see what data is actually inside.
Examples
Decode a Base64 string
Input
eyJhIjoxfQ==
Output
{"a":1}About the Convert Base64 to JSON tool
Convert Base64 to JSON runs as plain JavaScript in your browser tab, with no server behind it. Decode Base64 back to JSON data. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's JSON Tools section, 90 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
You can shape the output with the Prettify output setting, and the result refreshes the moment you change it. A worked example further down the page shows exactly what the tool produces for a real input.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Is Convert Base64 to JSON free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.