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Developer
4
tools
-
JS validators, JSON formatters and encoders.
Base64 Encoder/Decoder
Encode or decode Base64 text instantly, in your browser.
JavaScript Validator
Validate JavaScript syntax instantly in your browser. No upload, no tracking.
JSON Formatter
Format, validate and minify JSON instantly.
Timestamp Converter
Convert Unix timestamps to dates and back. Seconds or milliseconds, ISO 8601, local time, UTC.
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About the category
The Developer category is a toolkit for everyday coding tasks: validate, format, encode, decode, hash, and inspect. Whether you work with JavaScript, JSON, URLs, CSS, Base64, or regex, this is where the small utilities live - the ones that save 30 seconds here, 2 minutes there, dozens of times a day.
How to choose a tool
1
If your JavaScript throws an error
Use the JavaScript Validator. Paste the code, click Validate, and get the exact syntax error with line and column numbers.
2
If your JSON API response looks wrong
Use the JSON Formatter. Paste the response, click Format, and see exactly where the syntax breaks.
3
If you need to decode a JWT or Base64 string
Use the Base64 Encoder/Decoder. Paste the string, click Decode, and get the original text.
Frequently Asked Questions
Is my code sent to a server? v
No. Every Dev tool runs entirely in your browser using standard web APIs (JavaScript's Function constructor, JSON.parse, the browser's native Base64 functions). Your code never leaves your device.
Does the JS Validator support TypeScript? v
No. It validates standard JavaScript syntax. For TypeScript, use the TypeScript Playground. This tool uses the browser's JavaScript parser, which doesn't understand TypeScript-specific syntax.
Does the JSON Formatter support JSON5 or JSONC? v
No. It validates strict RFC 8259 JSON. JSON5 (with comments, single quotes, trailing commas) and JSONC (VS Code config format) are different standards and will produce errors here.
Can I use these tools offline? v
Yes for most tools. Once the page is loaded, the calculation happens locally and continues working without internet.
Why does my code fail validation when it works in my editor? v
Common causes: your code uses TypeScript or JSX syntax, your editor is running Babel or TypeScript, or your snippet is a partial file that depends on surrounding context.
Can I share the formatted output? v
Yes. Every result has a copy button. You can also share a link to the tool page - the input is not saved to the URL for privacy reasons.
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