All Free Online Developer Tools

Beautify minified JSON with 2- or 4-space indent and key sorting.

Catch missing commas, quotes, and structural errors instantly.

Edit, reshape, and validate JSON with live syntax checking.

Make compact JSON readable with consistent indentation.

Browse JSON as a collapsible, searchable tree structure.

Inspect parsed JSON structure with type-aware breakdown.

Strip whitespace to shrink JSON payloads for production.

Quickly scan large JSON files with smart navigation.

Escape JSON for embedding in JS, Java, or Python source code.

Collapse multi-line JSON into a single compact string.

Highlight added, removed, and changed keys side by side.

Sort object keys alphabetically — deep or shallow modes.

Check TOML configuration files for syntax errors.

Browse NDJSON streams with collapsible record cards.

Validate newline-delimited JSON line by line.

Convert JSON to XML with attribute mapping and custom root tag.

Flatten arrays of objects into CSV with auto-detected headers.

Convert JSON to clean block-style YAML.

Tab-separated output ready for Excel and Google Sheets paste.

Escape JSON for safe embedding inside source-code strings.

Convert XML to JSON with @-prefixed attributes and #text nodes.

Flatten repeated XML elements into tabular CSV rows.

Escape XML for use inside JS, Java, or C# string literals.

Convert XML hierarchies into readable YAML mappings.

Parse RSS or Atom feeds into clean structured JSON.

Convert YAML configs and Kubernetes manifests to JSON.

Wrap YAML mappings as XML elements with a custom root.

Flatten nested YAML keys with dot notation into CSV rows.

Parse CSV with header detection and automatic type inference.

Generate XML from CSV with configurable row and root tags.

Emit a clean YAML list-of-mappings from CSV rows.

Render CSV as an accessible HTML table with thead and tbody.

Unescape stringified JSON back into a parseable object.

Render JSON arrays of objects as a sortable HTML table.

Flatten repeated XML elements into an HTML table.

Preview CSV rows as an interactive HTML table.

Convert tab-separated values into an HTML table.

Extract table-like data from arbitrary HTML.

Convert JSON to TOML configuration format.

Parse TOML configs into JSON for tooling.

Split a JSON array into newline-delimited records.

Combine NDJSON lines into a single JSON array.

Generate a GraphQL schema from a JSON sample.

Convert a GraphQL SDL schema into a JSON AST.

Render JSON as a Markdown document or table.

Parse Markdown structure into a JSON tree.

Render CommonMark Markdown to clean HTML.

Convert HTML markup back to portable Markdown.

Beautify XML with consistent indent and clean self-closing tags.

Strip whitespace and comments to shrink XML payloads.

Browse XML as a collapsible tree with attributes shown inline.

Re-indent XML for readable diffs and pull-request review.

Verify well-formedness with line-number error reporting.

Edit XML with live validation and auto-close tag support.

Inspect parsed structure and convert to JSON for tooling.

Format WSDL service definitions while preserving namespaces.

Format SOAP envelopes for inspecting requests and responses.

Catch indentation, tab, and duplicate-key errors before deploy.

Browse YAML as a clean normalised indented tree.

Normalise YAML indent and spacing to 2 or 4 spaces.

Surface YAML 1.1 quirks like the Norway problem and types.

Beautify HTML with consistent indent and attribute spacing.

Re-indent HTML for clean diffs in code review.

Verify tag matching, void elements, and well-formedness.

Render HTML as a clean DOM tree for visual inspection.

Edit and format HTML with live preview and validation.

Restore line breaks and indent to minified JavaScript code.

Strip whitespace and comments to shrink production HTML.

Compile Pug or Jade indent syntax to plain HTML markup.

Convert HTML markup back to Pug / Jade indent syntax.

Paste an Excel range and get an accessible HTML table.

Format Vue.js Single File Components — template, script, style.

Format Angular templates with structural directives.

Format Babel-transpiled JavaScript output for debugging.

Format Markdown + JSX with preserved code and content blocks.

Format Glimmer.js / Ember Handlebars templates.

Format Salesforce Lightning Web Components templates.

Format JavaScript with Flow type annotations.

Encode <, >, &, ", ' to entities for safe display.

Decode named and numeric HTML entities to characters.

Encode the 5 XML predefined entities for safe text content.

Decode XML predefined and numeric character references.

Escape strings for JS literals — \n, \u00xx, \xNN.

Decode JS escape sequences back to original characters.

Escape strings for Java literals with \u00xx Unicode form.

Decode Java escape sequences including octal escapes.

Escape strings for C# / VB regular and verbatim literals.

Decode C# and VB string escape sequences.

Escape ", \, and control chars per RFC 8259.

Decode JSON escape sequences back to readable text.

Quote CSV fields per RFC 4180 with doubled inner quotes.

Strip RFC 4180 quoting and unwrap doubled quotes.

Escape single quotes for legacy SQL string literals.

Decode SQL string literal escape sequences.

Percent-encode any string per RFC 3986 for safe URLs.

Reverse percent-encoding back to the original characters.

Pass JSON safely as a URL query parameter value.

Decode percent-encoded JSON from URLs and re-format.

Encode XML payloads for URLs and HTTP form fields.

Recover XML from URL-encoded query string parameters.

Encode YAML configs for URL parameter passing.

Decode YAML from URL-encoded strings.

General-purpose Base64 encode and decode for any string.

Decode Base64 (incl. JWT payload) and pretty-print JSON.

Encode JSON for K8s Secrets, JWT payloads, or data URLs.

Decode Base64 to XML — useful for SOAP MTOM attachments.

Encode XML for embedding in JSON, K8s Secrets, or data URLs.

Decode Base64-encoded YAML for the K8s Secret workflow.

Encode YAML for K8s Secret stringData and data fields.

Decode Base64 to image preview — PNG, JPEG, GIF, WebP, SVG.

Strip whitespace, comments, and trailing semicolons.

Format CSS with consistent indent and one rule per line.

Re-indent CSS for clean diffs and pull-request review.

Wrap selectors as nested LESS rules with @variables.

Convert flat CSS to nested SCSS with $variable hints.

Convert CSS to indent-based Sass syntax (no braces).

Convert CSS to Stylus — no braces, no semicolons.

Compile LESS @variables, mixins, and nesting to flat CSS.

Convert @variables to $variables and adjust syntax.

Compile SCSS nesting, $variables, and mixins to flat CSS.

Convert $variables to @variables and adjust syntax.

Compile indented Sass syntax to plain CSS rules.

Convert indented Sass to braces-style SCSS syntax.

Convert LESS to indented Sass syntax (no braces).

Convert LESS to Stylus — minimal punctuation.

Convert braces SCSS to indented Sass syntax.

Convert SCSS to Stylus.

Convert indented Sass to LESS with @variables.

Convert indented Sass to Stylus.

Compile Stylus to plain CSS rules.

Convert Stylus to LESS with @variables.

Convert Stylus to braces-style SCSS.

Convert Stylus to indented Sass syntax.

Restore line breaks and indent in minified JavaScript.

Format JS with consistent indent and brace style.

Strip whitespace and comments to shrink JavaScript bundles.

Format JSON5 — comments, trailing commas, unquoted keys.

Validate JSON5 syntax extensions like hex and Infinity.

Format React JSX with proper indent and prop alignment.

Format TypeScript JSX with type annotations preserved.

Minify JSX while keeping the React tree intact.

Migrate JSX components to TypeScript TSX with type stubs.

Beautify minified JSON with 2- or 4-space indent.

Beautify XML with consistent indent and attribute spacing.

Format HTML for readable diffs and clean code review.

Normalise YAML indent and spacing per ecosystem convention.

Beautify CSS with one rule per line and clean spacing.

Format C# code with Allman braces and Roslyn defaults.

Format Java with Google or Sun convention brace style.

Format GraphQL SDL queries, mutations, and schema.

Format TS with type annotations and generic spacing.

Format PHP code following the PSR-12 standard.

Normalise headings, list bullets, and table alignment.

Format LESS with indented nested rules and @variables.

Format SCSS with $variables, @mixin, and @include.

Beautify SQL with consistent keyword case and clean indent.

Format Vue.js Single File Components.

Format Angular templates with structural directives.

Format Babel-transpiled JavaScript output.

Format Markdown with embedded JSX.

Format Glimmer.js / Ember Handlebars templates.

Format Salesforce Lightning Web Components.

Format JavaScript with Flow type annotations.

Generate POJO classes with Jackson or Gson annotations.

Generate @dataclass with type hints and Optional fields.

Generate strict interfaces with optional `?:` fields.

Generate POCO classes with [JsonProperty] attributes.

Generate Go struct with `json:"field"` struct tags.

Generate struct with #[derive(Serialize, Deserialize)].

Generate Swift struct conforming to Codable protocol.

Generate Kotlin data class for kotlinx.serialization.

Generate Dart class with fromJson / toJson methods.

Generate Ruby class with attr_accessor or symbol hash.

Generate JAXB POJO with @XmlElement and @XmlAttribute.

Generate dataclass with @attr field for XML attributes.

Generate interface with @-prefixed attribute keys.

Generate POCO with [XmlElement] and [XmlAttribute] for XmlSerializer.

Generate Go struct with `xml:"name,attr"` struct tags.

Generate struct compatible with serde-xml-rs / quick-xml.

Generate Codable struct with XMLCoder support.

Generate data class for kotlinx-serialization-xml or JAXB.

Generate iOS NSObject @interface from JSON.

Generate JSON Schema (Draft 2020-12) from sample data.

Generate C++ struct with std::string / std::vector fields.

Generate Crystal class with JSON::Serializable.

Generate React PropTypes definitions from JSON shape.

Generate Flow type alias from JSON sample.

Generate Elm record + JSON decoder.

Generate Pike typed mapping from JSON.

Generate Haskell `data` declaration with Aeson instances.

Generate iOS NSObject @interface from XML.

Convert XML to JSON Schema with @-prefixed attributes.

Generate C++ struct compatible with pugixml or rapidxml.

Generate Crystal class with XML mapping.

Generate React PropTypes from XML structure.

Generate Flow types from XML structure.

Generate Elm record + custom XML decoder.

Generate Pike typed mapping from XML.

Generate Haskell data type with xml-conduit / hxt-pickle.

Normalise headings, list bullets, and table alignment.

Render CommonMark Markdown to clean semantic HTML.

Convert HTML markup back to portable Markdown.

Render JSON as a Markdown document or table.

Parse Markdown structure into a JSON tree.

Build clean Markdown tables with alignment controls.

Convert base-10 integers to binary representation.

Convert base-10 integers to hexadecimal.

Convert base-10 integers to base-8 octal.

Convert binary strings to base-10 integers.

Convert hexadecimal to base-10 integers.

Convert base-8 octal to base-10 integers.

Convert hexadecimal directly to binary representation.

Convert binary strings directly to hexadecimal.

Count characters, with and without whitespace.

Count words, sentences, paragraphs, and reading time.

Compare two text blocks and highlight every change.

Convert text to UPPER, lower, Title, camelCase, snake_case.

Sort lines alphabetically — case sensitive or natural.

Reverse text by characters, words, or lines.

Encrypt text with AES-GCM using the Web Crypto API.

Decrypt AES-GCM ciphertext back to plaintext.

Generate HMAC SHA-256/384/512 message digests.

Verify an HMAC signature against expected value.

Compress text with gzip and view Base64 / hex output.

Decompress gzip Base64/hex payloads back to text.

Compress text with zlib (deflate) and view output.

Decompress zlib payloads back to original text.

Apply the classic ROT13 letter rotation to any text.

Encode or decode with a configurable Caesar shift.

Convert PNG images to JPG with quality controls.

Convert JPG images to lossless PNG.

Convert PNG to modern WebP for smaller file sizes.

Convert WebP back to PNG for legacy compatibility.

Encode any image as a Base64 data URL for inline use.

Strip metadata and shrink SVG markup for production.

Convert OpenAPI / Swagger YAML specs to JSON.

Convert OpenAPI JSON specs to YAML for readability.

Validate OpenAPI 3.x specs against the spec schema.

Validate Swagger 2.0 specs and report errors.

Encode JSON to compact MessagePack binary format.

Decode MessagePack binary data back to JSON.

Encode JSON to CBOR (RFC 8949) binary format.

Decode CBOR binary payloads back to JSON.

Convert HashiCorp HCL (Terraform) configs to JSON.

Convert JSON back into HashiCorp HCL syntax.

Validate Kubernetes manifest YAML against the schema.

Lint Dockerfile syntax and best-practice violations.