Base64 to JSON Converter
ConvertersDecode a Base64-encoded string to a JSON object instantly in your browser. Handles standard and URL-safe Base64. Swap to JSON→Base64 in one click. Client-side.
Base64 → JSON
Base64plaintext
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JSONjson
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Input: 36 chars
About Base64 to JSON Converter
The Base64 to JSON converter decodes a Base64 string using `atob` and then parses the result as JSON. Both standard Base64 and URL-safe Base64 (with `-` and `_`) are accepted — the converter normalises them automatically. The JSON output has an interactive tree view and graph visualization. Swap to JSON→Base64 with one click.
Features
- ✓Bidirectional — edit either panel and the other updates in real time
- ✓Decodes standard Base64 (btoa/atob) and URL-safe Base64
- ✓Automatic normalisation of URL-safe characters (- → +, _ → /)
- ✓Parsed JSON shown with interactive tree view and graph visualization
- ✓Swap direction to JSON→Base64 with a single click
- ✓Download decoded JSON as a .json file
- ✓Copy output to clipboard in one click
- ✓100% client-side — data never leaves your browser
Common Use Cases
- Decoding JWT payload and header parts to inspect JSON claims
- Inspecting Base64-encoded JSON in API tokens or session cookies
- Decoding Base64 JSON environment variables for debugging
- Parsing Base64-encoded JSON from API responses or webhooks
Frequently Asked Questions
QCan it decode JWT tokens?
Yes — paste the middle segment (payload) of a JWT (between the dots) and the converter will decode and display the JSON claims. Note: JWTs use URL-safe Base64 without padding.
QDoes it handle Unicode in the Base64 payload?
Yes — the converter UTF-8 decodes the result of atob to correctly handle non-ASCII characters.
QIs my data sent to a server?
No. All decoding runs in your browser.