Question 1

How do I decode a Base64 string online?

Accepted Answer

Paste your Base64 string into SmartDevBox at smartdevbox.com. It automatically detects Base64 encoding and decodes it instantly — no configuration needed.

Question 2

How do I decode a JWT token without a secret?

Accepted Answer

Paste your JWT token into SmartDevBox. The JWT Inspector tool decodes the header and payload and displays them as readable JSON. Note: this decodes but does not verify the signature — you don't need the secret to read the claims.

Question 3

How do I format or pretty-print JSON?

Accepted Answer

Paste your minified or unformatted JSON into SmartDevBox. The JSON Formatter tool detects it automatically and pretty-prints it with configurable indentation.

Question 4

How do I convert a Unix timestamp to a human-readable date?

Accepted Answer

Paste a Unix timestamp (e.g. 1700000000) into SmartDevBox. The Unix Timestamp converter detects it and shows the equivalent date and time in UTC and your local timezone.

Question 5

How do I convert JSON to CSV?

Accepted Answer

Paste a JSON array of objects into SmartDevBox and select the JSON → CSV tool. It converts your data to comma-separated format with headers derived from the JSON keys.

Question 6

How do I compute a SHA-256 hash online?

Accepted Answer

Use the Hash Generator tool on SmartDevBox. Paste any text and it computes MD5, SHA-1, SHA-256, and SHA-512 hashes simultaneously in the browser.

Question 7

How do I parse and understand a cron expression?

Accepted Answer

Paste your cron expression (e.g. "0 9 * * 1-5") into SmartDevBox. The Cron Job Parser explains it in plain English and shows the next scheduled run times.

Question 8

How do I decode an X.509 certificate online?

Accepted Answer

Paste a PEM-encoded certificate (beginning with -----BEGIN CERTIFICATE-----) into SmartDevBox. The Certificate Decoder extracts and displays the subject, issuer, validity dates, public key, and extensions.

Question 9

Is SmartDevBox free to use?

Accepted Answer

Yes. SmartDevBox is completely free with no account or sign-up required. All tools run in the browser. An optional AI mode (for ambiguous input detection) can be enabled with your own OpenAI API key.

Question 10

Does SmartDevBox send my data to a server?

Accepted Answer

No. All tools run entirely in the browser using client-side JavaScript. Your data never leaves your machine unless you opt into the AI mode, which sends input to OpenAI for format detection.

Seconds to H:M:S Converter — Convert Seconds to Time Online

Common Use Cases

Privacy & Security

Seconds to H:M:S Converter — Convert Seconds to Time Online

Common Use Cases

Privacy & Security

Related Tools