All developer tools

Validate JSON syntax against RFC 8259 in real time. Precise line and column error reporting, 100% client-side.

Interactive collapsible tree viewer for large JSON documents with search, copy-path, and syntax highlighting.

Strip whitespace and shrink JSON payloads to the smallest possible size for APIs, storage, and network transfer.

Explore nested JSON as an interactive tree — expand, collapse, filter and copy JSON paths of any node.

Side-by-side comparison of two JSON documents with structural highlighting to spot differences instantly.

Structural diff of two JSON objects or arrays showing added, removed and modified keys with paths.

Test JSONPath expressions against any JSON document. Instant results with support for wildcards, filters, and recursion.

Validate JSON documents against a JSON Schema (draft-07 / 2019-09 / 2020-12) with precise error paths.

Parse JSON strings into structured objects with instant syntax errors, a live tree view and copyable JSON paths.

Pretty-print any JSON payload with 2, 4 or tab indentation. Beautify, validate and copy in one click.

Convert JSON into an escaped JavaScript string literal — ready to paste into code with correct quoting.

Convert an escaped JSON string back into pretty JSON. Handles \n, \" and unicode escape sequences.

Generate a JSON Schema (draft-07) from any JSON example — infers types, required fields and nested structure.

Format and beautify JSON5 with comments, trailing commas and unquoted keys. Parses JSON5 spec strictly.

Validate JSON5 syntax with precise error messages. Supports comments, trailing commas, single quotes.

Convert JSON arrays to CSV rows with automatic header detection and configurable delimiters.

Convert CSV tables to structured JSON with header inference, type coercion and streaming for large files.

Convert JSON documents into well-formed XML with configurable root element and attribute handling.

Convert XML documents into clean JSON, preserving element structure, attributes and namespaces.

Convert YAML configuration files into JSON while preserving comments, anchors and multi-document streams.

Convert JSON to clean, readable YAML. Preserve structure, arrays, and nested objects with configurable indent.

Generate TypeScript interfaces from any JSON sample. Handles nested objects, arrays and optional keys automatically.

Generate Go structs with JSON tags from any JSON sample. Handles nested objects, arrays and slices automatically.

Generate Python dataclasses from JSON. Emits Optional[] for nullable fields and type-safe field annotations.

Generate Java POJO classes from JSON. Boxed types for optional fields — safe for Jackson / Gson serialization.

Generate C# classes with auto-properties from JSON. Nullable reference types for missing values. Newtonsoft-ready.

Generate Kotlin data classes from JSON. Nullable types inferred, ready for kotlinx.serialization or Moshi.

Generate Swift Codable structs from JSON. Nested types inferred automatically — paste into Xcode and go.

Generate Rust structs with serde derives from JSON. Option<T> for nullable fields — production Rust patterns.

Generate Dart classes from JSON with named constructors. Ready for Flutter model classes.

Convert XML documents to clean YAML. Element structure and text preserved for config-file migrations.

Convert YAML to well-formed XML — great for interop between modern configs and legacy XML APIs.

Convert a YAML array of records into CSV rows with automatic header detection.

Convert CSV tables into a YAML list of records — headers become keys.

Convert a CSV table into structured XML — each row becomes an element with named children.

Encode or decode Base64 payloads with UTF-8 support. Handy for JWTs, data URIs and binary transport in JSON.

Decode JSON Web Tokens to inspect the header, payload and signature — verify claims and expiry in-browser.

Percent-encode or decode URLs and query strings. RFC 3986 compliant, UTF-8 safe, with component and full-URL modes.

Escape text into a valid JSON string literal — newlines, quotes and unicode handled automatically.

Unescape a JSON string literal back to plain text — reverses \n, \", \uXXXX and other escapes.

Escape HTML special characters (< > & " ') to entities. Safe injection into HTML markup.

Decode HTML entities back to characters — supports &amp; &lt; numeric &#39; and hex &#x27; forms.

Escape XML reserved characters to their entity form. Produces safe XML text content.

Decode XML entities back to characters — supports named, numeric and hexadecimal entity references.

Escape a plain string into a JavaScript string literal — handles quotes, backslashes and control characters.

Unescape a JavaScript string literal back into plain text. Handles \n \t \uXXXX.

Escape a plain string into a Java string literal — non-ASCII characters escaped as \uXXXX.

Unescape a Java string literal back into plain text — decodes \uXXXX and \n \t etc.

Escape a value for safe inclusion in a CSV cell — quotes fields containing commas, quotes or newlines.

Reverse CSV field quoting — strips surrounding quotes and unescapes doubled quotes.

Escape a string for safe inclusion in SQL literals — doubles single quotes and escapes backslashes.

Reverse SQL escaping — collapses doubled single quotes and escaped backslashes.

Convert JSON to a compact Base64-encoded string. Great for embedding JSON in URLs, cookies or headers.

Decode a Base64-encoded JSON payload and pretty-print the result. Perfect for JWT payload inspection.

URL-encode a JSON document for safe transport in query strings — validated as JSON first.

URL-decode a percent-encoded JSON string and pretty-print the parsed structure.

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes from any text. 100% in-browser via the Web Crypto API.

Generate v4 UUIDs (RFC 4122) in bulk. Copy individually or download as a list. Cryptographically random.

Test JavaScript regular expressions live. Highlights matches, capture groups and quantifiers in real time.

Format, indent and validate XML documents. Preserves attributes, CDATA and comments — 100% in-browser.

Pretty-print XML with configurable indentation. Auto-validates against parse errors and shows precise line diagnostics.

Explore XML documents as an expandable tree. Inspect nodes, attributes and text — no upload needed.

Validate XML syntax with detailed error messages. Instantly find missing tags, unquoted attributes and malformed structure.

Parse XML into structured JSON with attributes, text nodes and namespaces preserved. Handy for legacy APIs.

Format YAML documents with consistent indentation, comment preservation and anchor resolution. 100% offline.

Validate YAML syntax against the YAML 1.2 spec with precise error locations. Great for CI/CD config files.

Beautify HTML with consistent indentation, wrap long attributes and preserve inline scripts. Powered by js-beautify.

Preview HTML markup in a sandboxed live iframe. Toggle raw and rendered views without leaving your browser.

Beautify minified JavaScript, TypeScript or JSX with configurable indentation. Powered by js-beautify.

Format and beautify CSS or SCSS with consistent whitespace, property ordering and rule indentation.

Clean up Markdown — normalize blank lines, trim trailing whitespace, spacing around headings.

Pretty-print GraphQL queries and schemas with consistent indentation. Handy for readable queries in code review.

Format and beautify SQL queries with keyword casing, indentation and clean line breaks. Supports MySQL, PostgreSQL, T-SQL.

Beautify TypeScript source with consistent indentation and spacing. Powered by js-beautify.