Developer Tools

Free Developer Tools

Format JSON, convert CSV, encode URLs, decode Base64, inspect JWTs, escape HTML entities, convert number bases, and check timestamps. These utilities are built for quick debugging and data cleanup in the browser.

JSON Formatter

Validate, pretty-print, minify, and inspect JSON data in your browser.

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Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back into readable text.

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URL Encoder / Decoder

Percent-encode text for URLs or decode copied URL values.

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CSV to JSON

Convert spreadsheet-style CSV rows into structured JSON objects.

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JSON to CSV

Convert JSON arrays into CSV for spreadsheets, exports, and reports.

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HTML Entities

Encode special characters for HTML or decode entity text back to readable characters.

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Number Base Converter

Convert between binary, octal, decimal, and hexadecimal numbers.

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JWT Decoder

Inspect JWT headers and payloads without sending tokens to a server.

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Timestamp Converter

Convert Unix timestamps and readable dates for logs, APIs, and debugging.

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Use cases

When these tools help

Inspect copied API payloads, logs, tokens, and encoded values.
Move data between spreadsheet, JSON, URL, and text formats.
Debug small snippets without setting up a local script or sharing data with a third-party account.

Why browser-based developer utilities are useful

Small formatting and encoding tasks interrupt real work. A focused browser tool is often faster than opening an IDE, writing a one-off script, or pasting into a large SaaS product. The key is to understand what the transformation does and what it does not prove.

Formatting JSON does not validate business rules, Base64 is not encryption, and decoding a JWT does not verify its signature. Use these tools to inspect shape and syntax quickly, then rely on your application, tests, and security process for deeper validation.

All tools Start with JSON Formatter