01
Readable command output
Build a multiline cURL command that is easier to review, copy, document, and debug.
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API Key GeneratorGeneratorGenerate secure API keys with configurable length, prefix, quantity, and URL-safe, hexadecimal, Base32, or alphanumeric formats.→Alternating Case ConverterTextConvert ordinary text into alternating uppercase and lowercase letters while preserving spaces, punctuation, numbers, and line breaks.→BCrypt Hash GeneratorGeneratorUse this free BCrypt Hash Generator to create a salted password hash with a configurable cost and copy it for secure password-storage testing.→BCrypt VerifyValidatorVerify a plain-text password against a BCrypt hash safely, understand match results, and troubleshoot invalid hash formats without attempting to decode the hash.→Base64 DecoderEncode DecodeDecode Base64 into readable Unicode text for debugging, data recovery, API checks, configuration review, and development work→Base64 EncoderEncode DecodeEncode Unicode text as Base64 for data transport, API payloads, configuration values, testing, and development tasks→CRC32 GeneratorGeneratorGenerate CRC32 checksums from exact text in hexadecimal and decimal formats for compatibility checks, fixtures, archives, and data-transfer testing.→CSP Policy BuilderGeneratorBuild a Content Security Policy header with source directives, reporting, nonce and security options.→CSS BeautifierDeveloperUse CSS Beautifier to format compressed or inconsistent CSS online with readable indentation, line breaks, declarations, selectors, comments, and nested blocks.→CSS MinifierDeveloperMinify CSS by removing unnecessary spaces and comments for smaller stylesheets, cleaner delivery, and deployment workflows→CSV FormatterTableNormalize CSV rows, delimiters, quoting, whitespace, and column structure into consistent downloadable output.→CSV MergerTableCombine compatible CSV datasets into one file while checking headers, delimiters, and record structure.→CSV SplitterTableSplit a large CSV dataset into smaller files by row count while preserving the header and record structure.→CSV ValidatorValidatorValidate CSV structure, detect inconsistent rows, and identify quoting or delimiter problems before import.→CSV ViewerTableOpen CSV data in a clear table, inspect rows and columns, and review structured records before using them elsewhere.→CSV to JSON: Best Free Online ConverterDeveloperCSV to JSON converts CSV rows into structured JSON for APIs, imports, scripts, testing, and migration. 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Choose Draft 4, 6, 7, 2019-09 or 2020-12, infer nested types and detect common string formats.→JSON Schema ValidatorValidatorJSON Schema Validator checks JSON against a schema, reports exact validation paths, and helps you review required fields, types, formats, arrays, and nested objects online.→JSON SorterDeveloperUse this free JSON Sorter to alphabetize object keys recursively while preserving values, nested structures, and array order online.→JSON UnescapeEncode DecodeDecode JSON escape sequences such as escaped quotes, backslashes, newlines, tabs and Unicode sequences into readable text.→JSON ValidatorValidatorValidate JSON syntax and identify parsing errors before using data in an API, application, import, or configuration.→JSON ViewerDeveloperView JSON online as a readable tree, pretty-printed document, or flattened JSON path list with value types and depth controls.→JSON to CSVConverterConvert a JSON array of objects into CSV rows for spreadsheets, reports, imports, and structured-data review.→JSON to YAMLConverterConvert JSON data to readable YAML.→JWT DecoderEncode DecodeDecode JWT header and payload data for inspection without verifying the token signature or authenticity.→JWT GeneratorGeneratorCreate signed HS256 JSON Web Tokens.→JavaScript BeautifierDeveloperUse JavaScript Beautifier to format compact JavaScript online with readable indentation, braces, statements, operators, comments, strings, and template literals.→JavaScript MinifierDeveloperUse JavaScript Minifier to remove comments and unnecessary whitespace from JavaScript online while preserving strings, template literals, identifiers, and operators.→Line CounterTextCount total, non-empty, and blank lines in text, code, lists, logs, and documents with a clear browser workflow→Lines to Comma ListTextJoin non-empty trimmed lines into one comma-separated list while preserving the original item order.→Lowercase ConverterTextConvert cased letters to lowercase while preserving punctuation, spaces, and line breaks.→MD5 GeneratorGeneratorUse this free MD5 Generator to generate a MD5 hash from exact text, verify whitespace and encoding, and copy a clean hexadecimal digest online.→Markdown PreviewTextRender common Markdown syntax as safe HTML so structure and formatting can be reviewed before publishing.→Markdown to HTMLConverterConvert common Markdown syntax into HTML for previews, documentation, articles, notes, and lightweight publishing workflows.→Mention ExtractorTextExtract unique @mentions from authorized text and preserve the order in which accounts first appear.→Number ExtractorTextExtract signed integers and decimal values from mixed text while preserving their original order.→OpenAPI GeneratorGeneratorGenerate an OpenAPI 3.1 document from endpoint settings and JSON request or response samples.→OpenAPI ValidatorValidatorOpenAPI Validator reviews OpenAPI documents for structural and reference problems, helping teams detect invalid paths, operations, schemas, parameters, and responses online.→PEM FormatterEncode DecodeFormat PEM certificates and keys, validate matching boundary labels, and wrap Base64 content into standard 64-character lines.→Paragraph CounterTextCount non-empty text paragraphs separated by one or more blank lines.→Password Generator AdvancedGeneratorGenerate strong random passwords with custom length, character sets, exclusions, quantity controls, and secure browser-friendly output.→Password Strength CheckerValidatorCheck password strength using length, character variety, repetition, sequences, and common-pattern signals while keeping the result easy to understand.→Phone Number ExtractorTextExtract likely phone numbers from mixed text while preserving their original appearance and order.→Prefix LinesTextAdd the same prefix to every following line while preserving line order and line breaks.→Query String ParserNetworkParse a complete URL or raw query string into structured, readable JSON without changing the original input.→Quote LinesTextWrap every source line in quotation marks while preserving line order and line breaks.→RSA Key GeneratorGeneratorGenerate RSA public and private key pairs in PEM format with selectable key sizes and optional passphrase protection.→Random Password GeneratorGeneratorGenerate strong random passwords with a chosen length for accounts, test data, temporary credentials, and security-focused workflows.→Reading Time CalculatorCalculatorEstimate how long a text takes to read from its word count using a clear words-per-minute model.→Regex BuilderGeneratorBuild practical regular expressions from common matching requirements.→Regex ExtractorDeveloperExtract all regex matches and capture groups from text.→Regex ReplaceDeveloperReplace regex matches with text or capture-group references.→Regex Tester PRODeveloperTest regular expressions with detailed matches, named groups, offsets, line and column positions, execution timing, and highlighted previews.→Remove All SpacesTextRemove every whitespace character, including spaces, tabs, and line breaks, to create one uninterrupted string.→Remove Duplicate LinesTextKeep the first occurrence of each exact line, remove later duplicates, and preserve the original line order.→Remove Duplicate WordsTextRemove repeated words case-insensitively while keeping each first spelling and the original first-seen order.→Remove Empty LinesTextDelete blank and whitespace-only lines while preserving every populated line in its original order.→Remove Line NumbersTextStrip common leading line-number formats while leaving the remaining line content intact. Use it on copied transcripts, numbered exports, documentation and code samples.→Remove NumbersTextRemove numeric digits from text while keeping letters, punctuation, spacing, and line order available for review.→Remove PunctuationTextRemove punctuation characters from text while preserving words, numbers, spaces, and line order for review.→Remove TabsTextRemove tab characters from text while keeping the remaining content and line structure visible for comparison.→Remove WordTextremove word with a focused browser utility that targets the entered term while keeping the original source visible for careful comparison.→Reverse LinesTextreverse lines with a focused browser tool that changes only the order of complete lines while keeping every word, number, symbol, and punctuation mark inside each line unchanged.→Reverse TextTextreverse text with a browser utility that returns characters in the opposite order while keeping the original source visible for direct comparison.→Reverse WordsTextreverse words with a focused tool that changes the order of word tokens while keeping the characters inside each individual word readable.→SHA1 GeneratorGeneratorUse this free SHA1 Generator to generate a SHA-1 hash from exact text, verify whitespace and encoding, and copy a clean hexadecimal digest online.→SHA256 GeneratorGeneratorUse this free SHA256 Generator to generate a SHA-256 hash from exact text, verify whitespace and encoding, and copy a clean hexadecimal digest online.→SHA512 GeneratorGeneratorUse this free SHA512 Generator to generate a SHA-512 hash from exact text, verify whitespace and encoding, and copy a clean hexadecimal digest online.→SQL BeautifierDeveloperFormat SQL queries with readable clauses, indentation, line breaks, joins, conditions, grouping, and ordering.→SQL FormatterDeveloperFormat SQL statements with clearer indentation and line breaks for review, debugging, documentation, and database development.→SQL MinifierDeveloperCompress SQL queries by removing comments and unnecessary whitespace while keeping statements easy to copy and deploy.→SSH Key GeneratorGeneratorGenerate an RSA SSH public and private key pair with selectable strength, OpenSSH public-key output, and a SHA-256 fingerprint.→Secure Random GeneratorGeneratorGenerate cryptographically secure random bytes, strings, URL-safe values, and integers for development and security workflows.→Sentence Case ConverterTextThis sentence case converter changes irregular capitalization into a sentence-style pattern while keeping the original text available for comparison.→Sentence CounterTextUse this sentence counter to estimate the number of sentence units in articles, essays, notes, product descriptions, and other text.→Shuffle LinesTextShuffle lines into a random order while keeping every line available for review in a separate result.→Slug Generator: Best Free Online ToolTextSlug Generator creates a clean, lowercase, hyphenated URL slug from any title or phrase. Use this free online tool to review an SEO-friendly result before publishing or changing a permalink.→Sort LinesTextSort lines in ascending alphabetical or natural order while preserving the original source for comparison.→Sort Lines DescendingTextSort lines from Z to A or from higher to lower natural values with a separate result for verification.→Suffix LinesTextAdd the same suffix to every line while keeping the original list visible for careful comparison.→Tabs to SpacesTextReplace tab characters with a consistent number of spaces for code, plain text, logs, tables, and formatting cleanup→Text Diff CheckerCompareCompare two text versions line by line and identify additions, removals, and unchanged content.→Text RepeaterTextRepeat text a chosen number of times with predictable separators for testing, templates, sample data, and content preparation→Text StatisticsTextMeasure words, characters, sentences, paragraphs, lines, and estimated reading time in one document overview.→Timestamp ConverterConverterConvert Unix timestamps and date-time values.→Title Case ConverterTextConvert headings and titles into consistent title case for articles, pages, product names, documents, and publishing workflows→Token GeneratorGeneratorGenerate secure session, CSRF, URL-safe, hexadecimal, and Base64 tokens from cryptographically secure random bytes.→Trim WhitespaceTextRemove unwanted spaces around every line without changing the meaningful text inside each line.→URL DecoderEncode DecodeDecode percent-encoded URLs and query values into readable text for debugging, analysis, testing, and content review→URL EncoderEncode DecodeEncode text and reserved characters for query strings, links, redirects, API requests, and safe URL handling→URL ExtractorTextExtract web addresses from text, HTML, logs, exports, and documents for audits, migration, outreach, and review→URL ParserNetworkUse this free URL Parser to split any absolute link into scheme, host, port, path, query parameters, and fragment online.→UUID DecoderEncode DecodeDecode a UUID into version, variant, hexadecimal fields, node data, clock sequence, and timestamp information when the version supports it.→UUID GeneratorGeneratorGenerate random UUID version 4 identifiers for development, databases, fixtures, APIs, testing, and content-management workflows.→UUID ValidatorValidatorValidate UUID syntax online, identify versions 1 through 8, confirm the RFC variant, and understand why an identifier is invalid.→Unique Word FinderTextFind distinct words, repeated terms, and vocabulary patterns in text for editing, research, SEO, and content analysis→Uppercase ConverterTextConvert letters to uppercase instantly while preserving punctuation, numbers, spacing, and line order.→Word CounterTextCount words, characters, sentences, and paragraphs in text for writing, editing, SEO, study, and content planning→Word Frequency CounterTextCount how often every word appears, rank repeated terms, and inspect vocabulary balance in any pasted text.→Words to LinesTextPlace words or separated values on individual lines for lists, imports, cleanup, deduplication, and data preparation→XML CompareCompareCompare two XML documents online, validate their structure, normalize indentation, and review changed elements, attributes, text nodes, and line positions.→XML Formatter: 7 Amazing Proven TipsDeveloperFormat and indent XML for easier inspection, debugging, configuration review, data exchange, and development workflows→XML Validator: 7 Amazing Proven TipsValidatorValidate XML structure and syntax to find malformed tags, broken nesting, and parsing problems before import or deployment→XML to CSVConverterConvert repeated XML records into CSV rows for spreadsheets, imports, reporting, and data review.→XML to JSONConverterConvert XML elements, attributes, text values, and repeated nodes into readable structured JSON online.→YAML CompareCompareYAML Compare helps you compare two YAML documents, detect added, removed, changed, and type-mismatched values, and review differences with a clear online workflow.→YAML FormatterDeveloperFormat and indent YAML data.→YAML ValidatorValidatorValidate YAML syntax and structure.→YAML to JSONConverterConvert YAML data to formatted JSON.→cURL BuilderGeneratorBuild secure cURL commands for HTTP requests with methods, headers, query parameters, authentication, and request bodies.→
Generator
Ready
cURL Builder
Build secure cURL commands for HTTP requests with methods, headers, query parameters, authentication, and request bodies.
GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS methods Query parameter encoding Custom request headers Bearer, Basic, and API key authentication
Review generated commands before running them. Avoid pasting production secrets into shared devices, screenshots, logs, or support messages.
INPUT Request URL *
Generated cURL command
Shell-safe cURL command ready to review and copy.
About the tool
What cURL Builder does
cURL Builder is a powerful online cURL command generator for developers, QA engineers, API testers, technical writers, and support teams. It turns a structured HTTP request into a readable shell command without forcing you to remember every cURL option. Configure the endpoint, request method, query parameters, headers, authentication, body type, redirects, and compression, then copy the generated command.
The cURL Builder supports common REST API workflows such as GET requests with search parameters, authenticated POST requests with JSON, form submissions, PATCH updates, DELETE calls, and header-based API keys. Query names and values are URL encoded automatically. Header lines are validated before they are added, and JSON request bodies are parsed before output so malformed JSON is caught early.
Generated commands use shell-safe quoting for values. Even so, always review the result before execution. Access tokens, passwords, private API keys, session cookies, and customer data should not be shared in screenshots, issue trackers, chat messages, analytics, or public command history.
How to use
- Enter the request URL. Use a complete HTTP or HTTPS endpoint.
- Select the HTTP method. GET reads data, while POST, PUT, PATCH, and DELETE commonly change server state.
- Add query parameters. Enter one name=value pair per line.
- Add request headers. Use one Header-Name: value line for each header.
- Configure authentication. Choose Bearer, Basic, API key, or no authentication.
- Add the request body. Select JSON, form, text, XML, or no content type.
- Generate and review. Confirm the URL, method, credentials, headers, and body before running the command.
Built for the task
Why use cURL Builder?
Focused controls, predictable output, and a workflow designed around this exact transformation.
02
Safer value quoting
Headers, credentials, body content, and the final URL use shell-safe single-quoted values.
03
Complete HTTP configuration
Combine methods, parameters, headers, authentication, redirects, compression, and body content.
04
Input validation
Catch invalid URLs, malformed headers, incomplete authentication values, and invalid JSON before execution.
Useful answers
Questions about cURL Builder
Practical details about input, output, privacy, limits, and the best way to use this tool.
Answer 01
What is cURL Builder?
cURL Builder is an online tool that converts HTTP request settings into a cURL shell command. It supports methods, query parameters, headers, authentication, bodies, redirects, and compressed responses.
Answer 02
Does cURL Builder send the HTTP request?
No. It generates a command for review and copying. The request is sent only when you run the resulting command in your own terminal or environment.
Answer 03
Can I generate a POST request with JSON?
Yes. Choose POST, select JSON as the content type, and paste a valid JSON body. The builder adds the Content-Type header when one is not already present.
Answer 04
How are query parameters added?
Enter one name=value pair per line. The builder URL encodes names and values and appends them to the endpoint using the correct question mark or ampersand separator.
Answer 05
Which authentication modes are supported?
The tool supports Bearer tokens, Basic username:password authentication, API key headers, and requests without authentication.
Answer 06
Can I add custom headers?
Yes. Enter one Header-Name: value pair per line. Invalid header names and incomplete lines are rejected.
Answer 07
Is the generated command safe to share?
Not automatically. Generated commands may contain passwords, tokens, cookies, API keys, private URLs, or personal data. Remove secrets before sharing.
Answer 08
Why is the command split across several lines?
Multiline output is easier to inspect and edit. Backslashes continue the same shell command on the next line.
Answer 09
Does it support Windows Command Prompt?
The generated output targets common POSIX-style shells such as Bash and Zsh. PowerShell and Windows Command Prompt use different quoting and line-continuation rules.
Answer 10
Why validate JSON before generating cURL?
Malformed JSON is a common cause of failed API requests. Early validation prevents creating a command that sends an invalid JSON document.
What is cURL Builder?
cURL Builder is an online tool that converts HTTP request settings into a cURL shell command. It supports methods, query parameters, headers, authentication, bodies, redirects, and compressed responses.
Does cURL Builder send the HTTP request?
No. It generates a command for review and copying. The request is sent only when you run the resulting command in your own terminal or environment.
Can I generate a POST request with JSON?
Yes. Choose POST, select JSON as the content type, and paste a valid JSON body. The builder adds the Content-Type header when one is not already present.
How are query parameters added?
Enter one name=value pair per line. The builder URL encodes names and values and appends them to the endpoint using the correct question mark or ampersand separator.
Which authentication modes are supported?
The tool supports Bearer tokens, Basic username:password authentication, API key headers, and requests without authentication.
Can I add custom headers?
Yes. Enter one Header-Name: value pair per line. Invalid header names and incomplete lines are rejected.
Is the generated command safe to share?
Not automatically. Generated commands may contain passwords, tokens, cookies, API keys, private URLs, or personal data. Remove secrets before sharing.
Why is the command split across several lines?
Multiline output is easier to inspect and edit. Backslashes continue the same shell command on the next line.
Does it support Windows Command Prompt?
The generated output targets common POSIX-style shells such as Bash and Zsh. PowerShell and Windows Command Prompt use different quoting and line-continuation rules.
Why validate JSON before generating cURL?
Malformed JSON is a common cause of failed API requests. Early validation prevents creating a command that sends an invalid JSON document.
Learn URL Encoding
Read the complete URL Encoding Guide
Learn percent-encoding, UTF-8 URLs, query strings, path segments, spaces, plus signs, and double-encoding mistakes.
- Percent-encoding rules
- Query strings and paths
- UTF-8 and double encoding
Read guide
Practical explanations and examples
How cURL Builder works online
The cURL Builder reads the request URL and validates that it uses HTTP or HTTPS. It then applies URL-encoded query parameters, validates header syntax, adds selected authentication, checks the request body, and produces a command. Values are quoted separately so spaces and many shell metacharacters remain part of the intended value.
The builder does not contact the endpoint. This separation lets you inspect the request before execution and makes the result suitable for API documentation, bug reports, terminal testing, and reproducible support instructions.
cURL Builder HTTP methods
GET
Use GET to retrieve resources without intentionally changing server state. Query parameters commonly control search, filtering, sorting, and pagination.
POST
Use POST to create resources, submit forms, start jobs, or perform actions defined by an API.
PUT and PATCH
PUT commonly replaces a complete resource, while PATCH commonly applies a partial update. Actual behavior depends on the API specification.
DELETE
DELETE requests can permanently remove or deactivate data. Review the endpoint and authentication carefully before execution.
cURL Builder headers and authentication
Headers communicate accepted response formats, content types, conditional request values, request identifiers, authorization credentials, and vendor-specific options. Add only headers required by the target API. Duplicate or contradictory headers can cause confusing server behavior.
Bearer authentication creates an Authorization: Bearer value. Basic authentication uses cURL user credentials. API key mode accepts a custom header name and value because APIs use different names such as X-API-Key or Api-Key.
cURL Builder request bodies and content types
JSON is common for REST APIs. Form URL encoded content is common for traditional forms and OAuth token endpoints. Plain text and XML remain useful for specialized integrations. A body can technically be sent with several methods, but the server decides whether it is accepted.
When JSON is selected, cURL Builder verifies that the body is valid JSON. This validation checks syntax only; it does not confirm required fields, business rules, or JSON Schema constraints.
Practical cURL Builder examples
GET with query parameters
curl -L --compressed 'https://api.example.com/v1/users?page=1&limit=20'POST JSON
curl -L --compressed -X POST -H 'Content-Type: application/json' --data-raw '{"name":"Trexmi"}' 'https://api.example.com/v1/users'Bearer token
curl -L --compressed -H 'Authorization: Bearer TOKEN' 'https://api.example.com/v1/profile'Custom API key
curl -L --compressed -H 'X-API-Key: SECRET' 'https://api.example.com/v1/reports'Common cURL Builder errors
Invalid URL
Include the protocol and a valid hostname. Relative paths are not complete request targets.
Malformed headers
Each custom header requires a colon between its name and value. Do not paste line breaks inside a header value.
Incorrect Content-Type
The declared type must match the body format. Sending JSON while declaring form data can make the server reject or misread the request.
Authentication failures
Confirm token scope, expiration, environment, header name, username, and password. A correct cURL command cannot make invalid credentials valid.
Shell quoting differences
The generated command targets POSIX-style shells. Translate quoting and continuation rules before using it in PowerShell or Command Prompt.
10-point cURL Builder security checklist
Use test accounts where possible. Remove credentials from terminal history. Do not commit commands containing secrets. Avoid disabling TLS verification. Confirm destructive methods and production hosts. Redact Authorization, Cookie, Set-Cookie, and API key values before sharing output.
Related Trexmi tools
Look up server responses with HTTP Status Code Lookup, inspect URL parameters with Query String Parser, and prepare API payloads with JSON Formatter.
Authoritative cURL references
Review the official cURL command-line documentation and the MDN HTTP method reference when building production requests.