100 tools

Data formats

100 free data formats tools, all running in your browser with no sign-up.

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JSON to YAML converterConvert JSON to clean YAML with 2 or 4 space indentation, quoting risky strings such as yes and 01234 and writing multi-line text as | blocks.
YAML to JSON converterConvert YAML to formatted JSON with line-numbered error messages, supporting | and > blocks, lists, maps and quoted strings.
JSON to TOML converterConvert JSON to a TOML 1.0 file with [table] sections and [[table]] arrays, with a choice for the null values TOML does not have.
TOML to JSON converterConvert a TOML file such as Cargo.toml or pyproject.toml to formatted JSON, checking TOML 1.0 rules with line-numbered errors.
JSON to INI converterConvert JSON to an INI file with [section] headers and key = value lines, turning deeper levels into dotted keys and quoting sensitive values.
INI to JSON converterConvert an INI file to JSON: each [section] becomes an object, with options to type numbers and true/false and to drop end-of-line comments.
JSON to .env converterConvert JSON to KEY=value environment variables for a .env file, joining levels with __ or _, upper-casing names and quoting values safely.
.env to JSON converterConvert a .env file to JSON with support for export, single and double quotes and multi-line values, and a list of repeated variables.
JSON to Java properties converterConvert JSON to a .properties file with dotted keys like server.port and Spring-style list[0] items, escaping characters per Java rules.
Java properties to JSON converterConvert a .properties file to nested or flat JSON, reading \uXXXX escapes, backslash line continuation and Spring list[0] keys.
YAML to TOML converterConvert YAML straight to TOML 1.0: nested maps become [table] sections and lists of maps [[table]], with a choice for null values.
TOML to YAML converterConvert a TOML file to readable YAML with 2 or 4 space indentation, carrying tables, arrays of tables, dates and multi-line text as | blocks.
YAML to properties converterConvert application.yml to application.properties for Spring Boot projects, with dotted keys, list[0] items and Java-style escaping.
Properties to YAML converterConvert application.properties to nested application.yml for Spring Boot, turning list[0] keys into lists and numbers and true/false into typed values.
YAML to .env converterConvert YAML settings to KEY=value environment variables for a .env file, joining levels with __ or _, upper-casing names and quoting safely.
.env to YAML converterConvert a .env file to a YAML map of variables and values, ready to paste under environment in Docker Compose or into Kubernetes files.
YAML validatorCheck a YAML file and see the line number and reason for any error, such as tabs in indentation, a duplicate key or an unclosed quote.
TOML validatorCheck a TOML file against TOML 1.0 and see the line and reason for any error, such as a repeated table, unquoted text or an impossible date.
.env file validatorCheck a .env file line by line: invalid names, lines without =, spaces around =, unquoted values with spaces, repeated variables and unclosed quotes.
YAML formatterFormat a YAML file with consistent 2 or 4 space indentation, optional alphabetical key sorting, uniform lists and quoting, and line-numbered errors.
JSON to XML converterConvert JSON into an indented XML document, with @keys as attributes, #text as element text and arrays as repeated elements.
XML to JSON converterConvert an XML document to formatted JSON: attributes become @keys, repeated elements become arrays, and errors show the line number.
XML to YAML converterConvert an XML document to readable, indented YAML, quoting values that YAML could misread such as yes, on or 08.
XML to CSV converterTurn repeating XML elements into a CSV table for Excel, with automatic record detection and flattening of nested elements.
HTML table to JSON converterExtract an HTML table to JSON as an array of objects keyed by column headers, with colspan, rowspan and multi-table pages supported.
RSS feed to JSON converterConvert an RSS 2.0, Atom or RSS 1.0 feed into clean JSON with each item title, link, date and summary, plus the item count.
GPX to CSV converterConvert GPX points from a sports watch or map app into CSV with latitude, longitude, elevation and time, plus the track length.
XML to Markdown table converterTurn repeating XML elements into a Markdown table for README files and docs, with record detection and | escaped in cells.
JSON to HTML table converterConvert a JSON array of objects into ready-to-paste HTML table markup, with a live preview and special characters escaped.
XML formatter and beautifierPretty print compressed or messy XML with clear indentation, checking the structure and pointing to the line of any error.
XML minifierShrink XML by removing whitespace and line breaks between tags and optionally comments, showing size before, after and the saving.
XML escape toolTurn the special characters &, <, >, " and ' into XML entities like & and < so any text fits in a tag or attribute safely.
XML unescape toolTurn XML entities such as <, & and س back into their characters, counting what was decoded and what was left.
CSV to XML converterConvert a CSV table into indented XML where each row is an element and each column a child named after its header.
XML validator (well-formedness)Check whether an XML document is well-formed: closed, matching tags, valid attributes and defined entities, with line and column.
XML to HTML table converterShow repeating XML elements as a table: ready HTML markup and a live preview, with record detection and nested fields flattened.
XML XPath value extractorPull values out of XML with a simple XPath such as /catalog/book/title or //book[@id="2"]/@lang, with a match count and list.
XML structure analyzerSee the structure of an XML document: every element path with its count and attributes, plus total elements, attributes and depth.
HTML table to XML converterConvert an HTML table to indented XML: each row an element and each column a tag named after its header, with table and tag choices.
Sitemap XML to URL listExtract every URL from a sitemap.xml or sitemap index into a plain list, with last modified dates and a count of duplicates.
CSV to Markdown table converterConvert CSV data into a Markdown pipe table for README files and GitHub, with column alignment and neat padding.
Markdown table to CSV converterTurn a Markdown pipe table into CSV that opens in Excel or Google Sheets, unescaping \| and turning <br> into line breaks.
CSV to HTML table converterConvert CSV data into HTML table code with thead and tbody, escaped special characters and an optional dir="rtl" for Arabic.
HTML table to CSV converterPaste HTML table code and extract its data to CSV, stripping tags, decoding entities like & and turning <br> into line breaks.
HTML table to Markdown converterConvert HTML table code into a tidy Markdown table for README files and docs, stripping tags and decoding entities.
Markdown table to HTML converterConvert a Markdown table to HTML table code, keeping the column alignment from the separator row, with an optional dir="rtl".
Markdown table formatterTidy a messy Markdown table: equal-width columns, missing cells filled in and alignment kept from the separator row.
CSV to SQL INSERT statementsTurn CSV data into SQL INSERT statements for your database, escaping quotes, leaving numbers unquoted and mapping empty cells to NULL.
CSV to JSON Lines (JSONL) converterTurn each CSV row into a JSON object on its own line (JSONL), keyed by the header row, with numbers and true/false typed.
JSON Lines (JSONL) to CSV converterConvert JSON Lines to CSV for Excel: one row per line, columns from every key seen, and the line number of any bad line.
TSV to CSV converterConvert tab-separated TSV data to comma-separated CSV, adding quotes automatically only where a cell needs them.
CSV to TSV converterConvert comma or semicolon CSV into tab-separated TSV, ready to paste straight into Excel and Google Sheets cells.
CSV to LaTeX table converterConvert CSV data to a LaTeX tabular for papers and theses, escaping special characters like & % _ with an optional booktabs style.
CSV to ASCII text tableTurn CSV into a plain-text table framed with + - | or Unicode box lines, handy for terminals, code comments and plain email.
Excel cells to CSV (copy and paste)Copy cells from Excel or Google Sheets, paste them and get CSV with commas or semicolons, trimming empty rows and columns at the edges.
Excel cells to Markdown tablePaste cells copied from Excel or Google Sheets and get a neat Markdown table for GitHub, Notion and technical docs.
Semicolon CSV to comma CSVConvert semicolon-separated CSV into standard comma CSV, with an option to change decimal commas like 3,5 into 3.5.
Comma CSV to semicolon CSVConvert comma CSV into semicolon CSV so it opens in columns in Excel set to a decimal comma, with an option to write 3.5 as 3,5.
Transpose CSV (swap rows and columns)Swap the rows and columns of CSV data so the first row becomes the first column, filling short rows with empty cells.
CSV viewerView CSV data as a readable table in your browser with row and column counts, supporting commas, semicolons and tabs.
JSON to TypeScript interfacePaste JSON and get ready TypeScript interfaces, with nested types, optional fields and null unions inferred from your data.
JSON to Go structTurn JSON into Go structs with json tags for the original keys, PascalCase field names and pointers for values that can be null.
JSON to Python dataclassWrite Python dataclasses from a JSON sample, with type hints, Optional for empty values and a class for each nested object.
JSON to Pydantic modelCreate Pydantic v2 models from JSON, with snake_case names, Field(alias) for the original keys and Optional for empty values.
JSON to Java class (POJO)Generate Java POJO classes from JSON with Jackson @JsonProperty annotations, boxed types for empty values and optional getters and setters.
JSON to C# classConvert JSON into C# classes with PascalCase properties, JsonPropertyName attributes for System.Text.Json and nullable types for empty values.
JSON to Rust struct (serde)Write Rust structs from JSON with serde derives, snake_case fields with rename and Option for values that are null or missing.
JSON to Swift Codable structCreate Swift structs that conform to Codable from JSON, with CodingKeys when names differ and optionals for empty values.
JSON to Kotlin data classConvert JSON into Kotlin data classes with @Serializable and @SerialName for kotlinx.serialization and nullable types.
JSON to Dart class (Flutter)Generate Dart classes from JSON with fromJson, toJson and null safety, ready for Flutter apps without code generation packages.
JSON to JSON Schema generatorInfer a JSON Schema (draft 2020-12) from a JSON sample, with types, required keys, null values and nested arrays.
JSON to Zod schemaWrite Zod schemas from a JSON sample with z.object for nested objects, .nullable and .optional, plus a TypeScript type via z.infer.
JSON to PHP classConvert JSON into PHP 8 classes with typed properties, nullable types for empty values and @var comments for array items.
JSON to SQL CREATE TABLEBuild a CREATE TABLE statement from a JSON array for PostgreSQL, MySQL, SQLite or SQL Server, with column types and NOT NULL.
JSON to GraphQL schemaWrite GraphQL SDL types from a JSON sample, with ! for non-null fields, [T] lists and a separate type per nested object.
JSON to Protobuf message (proto3)Create proto3 Protocol Buffers messages from JSON, with sequential field numbers, repeated for arrays and json_name for original keys.
JSON to Mongoose schemaCreate a Mongoose schema from a JSON document, with sub-schemas for nested objects, required for always-present fields and a ready model.
JSON to BigQuery schemaInfer a BigQuery table schema in JSON format from JSON rows or a document, with RECORD for objects and REPEATED for arrays.
JSON to JSDoc typedefWrite JSDoc @typedef definitions from JSON for JavaScript projects, so your editor knows the fields and types without moving to TypeScript.
JSON to Python TypedDictCreate Python TypedDict definitions from JSON, with NotRequired for missing keys, Optional for null values and support for keys that are not valid names.
JSON to PHP array converterConvert JSON into a ready-to-paste PHP array using [ ] or array( ) syntax, keeping key order and value types.
PHP array to JSON converterPaste a PHP array in [ ] or array( ) syntax and get formatted JSON, applying PHP rules for numeric keys and automatic indexes.
JSON to Python dict converterConvert JSON into a Python dict literal you can paste into code, turning true, false and null into True, False and None.
Python dict to JSON converterPaste a Python dict, list or tuple and get valid JSON, converting True, None and single-quoted strings automatically.
JSON to JavaScript object converterTurn JSON into a JavaScript object literal with unquoted keys where valid and single or double quotes as you choose.
JavaScript object to JSON converterPaste a JavaScript object with unquoted keys, single quotes, trailing commas or comments and get valid, formatted JSON.
JSON to Ruby hash converterConvert JSON into a Ruby hash with "key" => string keys or key: symbols, turning null into nil and escaping #{ } in strings.
Query string to JSON converterPaste a URL or query string to get JSON of every decoded parameter, with repeated keys collected into arrays.
JSON to query string converterConvert a JSON object into a correctly encoded query string, with four array styles and bracket support for nested objects.
Form URL-encoded to JSON converterTurn an application/x-www-form-urlencoded request body into nested JSON, reading brackets like user[name] and items[] the PHP way.
Cookie header to JSON converterPaste a Cookie header from the browser or a curl command to get JSON of cookie names and values, percent-decoded.
JSON to Cookie header converterTurn a JSON object of names and values into a valid Cookie header for curl and API tools, encoding disallowed characters.
Set-Cookie header parserParse one or more Set-Cookie header lines into JSON showing name, value, Expires, Max-Age, Domain, Path, Secure and SameSite.
HTTP headers to JSON converterPaste HTTP request or response headers as shown in developer tools and get a JSON object, with repeated headers collected into arrays.
JSON to HTTP headers converterConvert a JSON object into Name: value HTTP header lines and ready -H options for curl, with header name validation.
cURL to JavaScript fetch converterConvert a curl command into JavaScript fetch() code with method, headers, body and auth, including Copy as cURL output from browsers.
cURL to Python requests converterConvert a curl command into Python code using the requests library, with headers, data, auth and form fields, ready to run.
JSON array to JSON Lines converterConvert a JSON array into JSON Lines (NDJSON): each item compact on its own line, ready for BigQuery, training files and log tools.
JSON Lines to JSON array converterConvert JSON Lines or NDJSON into a single formatted JSON array, pointing to the line number of any invalid record.
NDJSON formatter and validatorValidate NDJSON line by line, then show each record pretty-printed for reading or re-compact it to one record per line.