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Developer Tools
Keep small data and debugging jobs close at hand. Format structured text, encode values, inspect tokens, compare patterns, and convert common developer formats.
A good place to start
Popular tools
- JSON Formatter and ValidatorValidate JSON syntax and format valid data with readable indentation.
- Base64 Encode and DecodeEncode UTF-8 text as Base64 or decode Base64 back to readable text.
- JWT DecoderDecode the JSON header and payload of a JWT without verifying its signature.
- Regex TesterTest JavaScript regular expressions against text and highlight matches.
All developer tools
16 tools
- Developer
JSON Formatter and Validator
Validate JSON syntax and format valid data with readable indentation.
- Developer
JSON to CSV
Convert arrays of JSON records into delimited CSV rows.
- Developer
CSV to JSON
Parse quoted CSV rows and convert them to JSON records.
- Developer
Base64 Encode and Decode
Encode UTF-8 text as Base64 or decode Base64 back to readable text.
- Developer
URL Encode and Decode
Encode or decode URL component text with browser-native functions.
- Developer
HTML Entity Encoder
Encode HTML-sensitive text characters or decode common character entities.
- Developer
JWT Decoder
Decode the JSON header and payload of a JWT without verifying its signature.
- Developer
UUID Generator
Generate random version 4 UUID values using the browser cryptographic random source.
- Developer
Hash Generator
Generate SHA-1, SHA-256, or SHA-512 digests with Web Crypto.
- Developer
Regex Tester
Test JavaScript regular expressions against text and highlight matches.
- Developer
Unix Timestamp Converter
Convert Unix timestamps to UTC dates or ISO dates to timestamps.
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Color Converter
Convert opaque CSS colors between HEX, RGB, and HSL formats.
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CSS, JavaScript, and HTML Minifier
Apply conservative comment and whitespace cleanup to CSS, JavaScript, or HTML snippets.
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XML Formatter
Check XML well-formedness and indent its markup for easier reading.
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YAML to JSON
Parse a YAML document and convert its values to formatted JSON locally.
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Cron Expression Explainer
Explain and validate the five fields of a common cron schedule.
Good to know
Frequently asked questions
Which developer tasks are available?
Tools cover JSON and YAML, CSV conversion, URL and Base64 encoding, HTML entities, JWT inspection, UUIDs, hashes, regular expressions, timestamps, and markup.
Are inputs processed locally?
These developer utilities process input in your browser. Check the individual page for tool-specific limitations and privacy details.
Does the JWT decoder verify a token?
No. Decoding shows the header and payload but does not verify the token signature or establish that the claims are trustworthy.
Can formatting validate syntax?
Formatters report syntax errors for supported formats such as JSON. A successful parse does not guarantee that data meets your application’s schema.
Should I paste production secrets?
Avoid placing credentials or sensitive production data into browser tools unless you have reviewed the page’s privacy behavior and your organization permits it.