# Developer tools

- Human page: https://happytails.ai/en/developer-tools/
- Markdown: https://happytails.ai/en/developer-tools.md
- Structured JSON: https://happytails.ai/agents/en/developer-tools/index.json
- Visibility: public

## Page guide

Find the tool you need, then open it to get started.

## All developer tools

- [ASCII to text](https://happytails.ai/en/developer-tools/ascii-to-text/): Decimal/hex ASCII codes and explicit distinction from Unicode. ([Markdown](https://happytails.ai/en/developer-tools/ascii-to-text.md))

- [Base64 encoder decoder](https://happytails.ai/en/developer-tools/base64-encoder-decoder/): Encode/decode tabs. ([Markdown](https://happytails.ai/en/developer-tools/base64-encoder-decoder.md))

- [Bcrypt generator](https://happytails.ai/en/developer-tools/bcrypt-generator/): Generate and verify locally with work-factor control. ([Markdown](https://happytails.ai/en/developer-tools/bcrypt-generator.md))

- [Binary to text](https://happytails.ai/en/developer-tools/binary-to-text/): Decode binary byte values into UTF-8 text. ([Markdown](https://happytails.ai/en/developer-tools/binary-to-text.md))

- [Chmod calculator](https://happytails.ai/en/developer-tools/chmod-calculator/): Numeric and symbolic Unix permission mapping. ([Markdown](https://happytails.ai/en/developer-tools/chmod-calculator.md))

- [Cron parser](https://happytails.ai/en/developer-tools/cron-parser/): Cron dialect and time-zone selection. ([Markdown](https://happytails.ai/en/developer-tools/cron-parser.md))

- [CSS formatter](https://happytails.ai/en/developer-tools/css-formatter/): Format/minify CSS with parser-based errors. ([Markdown](https://happytails.ai/en/developer-tools/css-formatter.md))

- [CSS inliner](https://happytails.ai/en/developer-tools/css-inliner/): Inline supported selectors for email HTML. ([Markdown](https://happytails.ai/en/developer-tools/css-inliner.md))

- [CSS minifier](https://happytails.ai/en/developer-tools/css-minifier/): Pinned parser with source-size comparison and downloadable output. ([Markdown](https://happytails.ai/en/developer-tools/css-minifier.md))

- [Curl to code](https://happytails.ai/en/developer-tools/curl-to-code/): Parse quoting, headers and body. ([Markdown](https://happytails.ai/en/developer-tools/curl-to-code.md))

- [File hash](https://happytails.ai/en/developer-tools/file-hash/): SHA-256 digest and compare expected value. ([Markdown](https://happytails.ai/en/developer-tools/file-hash.md))

- [Hex to text](https://happytails.ai/en/developer-tools/hex-to-text/): Decode hexadecimal byte values into UTF-8 text. ([Markdown](https://happytails.ai/en/developer-tools/hex-to-text.md))

- [HMAC generator](https://happytails.ai/en/developer-tools/hmac-generator/): Local keys and data. ([Markdown](https://happytails.ai/en/developer-tools/hmac-generator.md))

- [HTML escape](https://happytails.ai/en/developer-tools/html-escape/): Escape/unescape modes. ([Markdown](https://happytails.ai/en/developer-tools/html-escape.md))

- [HTML formatter](https://happytails.ai/en/developer-tools/html-formatter/): Format/minify with options. ([Markdown](https://happytails.ai/en/developer-tools/html-formatter.md))

- [HTML minifier](https://happytails.ai/en/developer-tools/html-minifier/): Configurable safe whitespace/comment treatment. ([Markdown](https://happytails.ai/en/developer-tools/html-minifier.md))

- [Javascript formatter](https://happytails.ai/en/developer-tools/javascript-formatter/): Parse and format code without executing it. ([Markdown](https://happytails.ai/en/developer-tools/javascript-formatter.md))

- [Javascript minifier](https://happytails.ai/en/developer-tools/javascript-minifier/): Syntax-target selection. ([Markdown](https://happytails.ai/en/developer-tools/javascript-minifier.md))

- [Jq playground](https://happytails.ai/en/developer-tools/jq-playground/): Run pinned jq version with resource limits. ([Markdown](https://happytails.ai/en/developer-tools/jq-playground.md))

- [JSON diff](https://happytails.ai/en/developer-tools/json-diff/): Structural rather than textual comparison. ([Markdown](https://happytails.ai/en/developer-tools/json-diff.md))

- [JSON escape](https://happytails.ai/en/developer-tools/json-escape/): Escape/unescape string literals with visible control-character handling. ([Markdown](https://happytails.ai/en/developer-tools/json-escape.md))

- [JSON formatter](https://happytails.ai/en/developer-tools/json-formatter/): Format and validate JSON in your browser. ([Markdown](https://happytails.ai/en/developer-tools/json-formatter.md))

- [JSON schema validator](https://happytails.ai/en/developer-tools/json-schema-validator/): Dialect-aware validation with exact instance paths and local reference resolution. ([Markdown](https://happytails.ai/en/developer-tools/json-schema-validator.md))

- [JSON to go](https://happytails.ai/en/developer-tools/json-to-go/): Struct tags, names, nullable fields and number-type options. ([Markdown](https://happytails.ai/en/developer-tools/json-to-go.md))

- [JSON to java](https://happytails.ai/en/developer-tools/json-to-java/): Class naming, lists, nullability and numeric precision options. ([Markdown](https://happytails.ai/en/developer-tools/json-to-java.md))

- [JSON to python](https://happytails.ai/en/developer-tools/json-to-python/): Dataclass or TypedDict output. ([Markdown](https://happytails.ai/en/developer-tools/json-to-python.md))

- [JSON to schema](https://happytails.ai/en/developer-tools/json-to-schema/): Choose schema dialect. ([Markdown](https://happytails.ai/en/developer-tools/json-to-schema.md))

- [JSON to typescript](https://happytails.ai/en/developer-tools/json-to-typescript/): Infer types from samples with optional properties and unions. ([Markdown](https://happytails.ai/en/developer-tools/json-to-typescript.md))

- [JSON validator](https://happytails.ai/en/developer-tools/json-validator/): Line/column errors and clear syntax-versus-schema validation scope. ([Markdown](https://happytails.ai/en/developer-tools/json-validator.md))

- [Jsonpath tester](https://happytails.ai/en/developer-tools/jsonpath-tester/): Show matched paths and values. ([Markdown](https://happytails.ai/en/developer-tools/jsonpath-tester.md))

- [JWT decoder](https://happytails.ai/en/developer-tools/jwt-decoder/): Decode header/payload locally. ([Markdown](https://happytails.ai/en/developer-tools/jwt-decoder.md))

- [Mock data generator](https://happytails.ai/en/developer-tools/mock-data-generator/): Schema-driven seeded synthetic CSV/JSON. ([Markdown](https://happytails.ai/en/developer-tools/mock-data-generator.md))

- [Number base converter](https://happytails.ai/en/developer-tools/number-base-converter/): Binary/octal/decimal/hex with large-integer precision and signed-number rules. ([Markdown](https://happytails.ai/en/developer-tools/number-base-converter.md))

- [Regex tester](https://happytails.ai/en/developer-tools/regex-tester/): Declare JavaScript flavor and flags. ([Markdown](https://happytails.ai/en/developer-tools/regex-tester.md))

- [RSA key generator](https://happytails.ai/en/developer-tools/rsa-key-generator/): Local cryptographic RNG and formats with interoperability review. ([Markdown](https://happytails.ai/en/developer-tools/rsa-key-generator.md))

- [SQL formatter](https://happytails.ai/en/developer-tools/sql-formatter/): Select dialect and format without executing queries. ([Markdown](https://happytails.ai/en/developer-tools/sql-formatter.md))

- [Token counter](https://happytails.ai/en/developer-tools/token-counter/): Explicit model/tokenizer version. ([Markdown](https://happytails.ai/en/developer-tools/token-counter.md))

- [Unix timestamp converter](https://happytails.ai/en/developer-tools/unix-timestamp-converter/): Seconds versus milliseconds, UTC/local zones and explicit out-of-range handling. ([Markdown](https://happytails.ai/en/developer-tools/unix-timestamp-converter.md))

- [URL encoder decoder](https://happytails.ai/en/developer-tools/url-encoder-decoder/): Encode or decode a URL component. ([Markdown](https://happytails.ai/en/developer-tools/url-encoder-decoder.md))

- [URL parser](https://happytails.ai/en/developer-tools/url-parser/): Show scheme, host, port, path, query and fragment. ([Markdown](https://happytails.ai/en/developer-tools/url-parser.md))

- [URL to punycode](https://happytails.ai/en/developer-tools/url-to-punycode/): Unicode domain and ASCII conversion with IDNA version stated. ([Markdown](https://happytails.ai/en/developer-tools/url-to-punycode.md))

- [UUID generator](https://happytails.ai/en/developer-tools/uuid-generator/): Declare UUID versions, secure randomness for v4 and batch copy/export limits. ([Markdown](https://happytails.ai/en/developer-tools/uuid-generator.md))

- [XML formatter](https://happytails.ai/en/developer-tools/xml-formatter/): Pretty-print/minify with safe parsing and explicit mixed-content handling. ([Markdown](https://happytails.ai/en/developer-tools/xml-formatter.md))

- [XML validator](https://happytails.ai/en/developer-tools/xml-validator/): Well-formedness validation. ([Markdown](https://happytails.ai/en/developer-tools/xml-validator.md))

- [YAML formatter](https://happytails.ai/en/developer-tools/yaml-formatter/): Pin YAML version. ([Markdown](https://happytails.ai/en/developer-tools/yaml-formatter.md))

- [YAML validator](https://happytails.ai/en/developer-tools/yaml-validator/): Line/column errors, duplicate-key policy and safe parsing without arbitrary constructors. ([Markdown](https://happytails.ai/en/developer-tools/yaml-validator.md))

## Format, validate and transform are different tasks

Formatting makes existing data or code easier to read. Validation checks whether it follows a syntax or schema. Conversion maps it into another representation. Choosing the right operation helps avoid treating a neatly formatted result as proof that the underlying data is correct.

## How to choose your next step

Start with a small representative sample. Confirm the syntax or language variant, then inspect errors and edge cases before applying the same operation to a larger input.

## Common questions about developer tools

### Does valid JSON mean the data is correct?

Syntax validation only establishes that the text can be parsed as JSON. A schema can check required fields and types, but neither proves that an email address, price or external record is factually correct.

### Is decoding the same as decrypting or verifying?

No. Base64 and URL encoding are representations, not encryption. Reading a token payload does not verify its signature. Use the specific validation or verification process required by the system receiving the result.