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Client: {{ targetShortLabel }} Method: {{ resultsReady ? computation.values.method : '—' }} Review: {{ resultsReady ? reviewBadge : 'Required' }}
The converter preserves the bounded request model and reports runtime-specific losses.
One HTTP(S) request, up to 50,000 characters. File reads, uploads, proxies, certificates, shell expansion, and command chains are rejected.
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{{ redact_secrets ? 'Replace recognized secrets' : 'Keep literal secret values' }}
Leave redaction on before copying, downloading, reviewing, or sharing generated code.
{{ include_comments ? 'Add review comments' : 'No generated comments' }}
The neutral default is off. Comments never execute or alter request fields.
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SignalValueMeaningCopy
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Compatibility review
  • {{ finding }}
cURL Command Generator Build a shell-ready cURL command from request fields or an existing command with body validation and safe quoting, plus credential warnings.
Application Programming Interface (API) Testing Tool Test HTTP APIs from your browser with cURL import and authentication while inspecting exposed headers, timing, response text and CORS failures.
Wget Command Generator Build a shell-quoted wget command for single downloads or recursive retrieval, with import parsing and warnings for risky options.
JSON Formatter Format JSON for review or transport, inspect its structure and byte size, and flag duplicate keys or precision risks before reuse.

A cURL command can be a compact record of an HTTP request: where it goes, which method it uses, what headers accompany it, whether it has a body, and how authentication is supplied. Turning that command into application code is useful when a terminal experiment becomes part of a script, service, test, or integration.

The difficult part is preserving request meaning across clients with different defaults. Redirects may be followed automatically in one runtime and require explicit handling in another. Browsers control some headers that command-line clients allow. Authentication helpers, body types, and error handling also have different spellings even when they describe the same HTTP message.

Request part Meaning to preserve Common conversion mistake
URL and method The target resource and intended action Sending a body as GET query text or changing POST into GET
Headers Representation type, preferences, credentials, and request metadata Keeping a header the target runtime controls or dropping a required content type
Body The exact bytes or text sent with the request Changing quoting, joining repeated data incorrectly, or reading a local file unintentionally
Redirect policy Whether a redirect is followed or returned for inspection Assuming every client has the same default and exposes the same response

Generated code is a starting point, not proof that a request is safe or correct. A syntactically valid snippet can still target the wrong environment, send production credentials, repeat a non-idempotent action, or behave differently under cross-origin browser rules. Review the request before running it.

Secrets need attention before conversion because cURL commands are often copied from shell history, browser developer tools, tickets, or documentation. Authorization headers, cookies, API keys, tokens, and Basic Auth passwords should normally become placeholders. Redaction lowers accidental sharing risk, but it cannot identify every secret hidden in a URL, body, or unusually named header.

A focused converter should reject features it cannot preserve safely. File uploads, local file reads, proxies, certificates, shell expansion, redirects through command chains, and multiple requests need a fuller migration than a one-request code projection can provide.

How to Use This Tool:

Treat the cURL command as inert request text, choose the runtime that will send it, and keep redaction on until placeholders have been reviewed.

  1. Choose a Target client from browser Fetch, Node.js Fetch, Python Requests, Go, PHP, Ruby, Java, or C#.
  2. Paste one cURL command containing exactly one absolute HTTP or HTTPS URL. Use backslash line continuations for a multi-line command; do not paste pipes, redirects, chained commands, variables, substitutions, or file-backed options.
  3. Leave Secret handling enabled. Recognized credentials become named placeholders in the generated code. Turn it off only when literal values are required and the result will remain private.
  4. Read Compatibility review before copying the snippet. Resolve omitted browser-controlled headers, redirect differences, redaction placeholders, and ignored response-only flags in the target runtime.

Interpreting Results:

The generated snippet should preserve the parsed method, URL, headers, body, credentials, and redirect choice. Compare those values in the request ledger with the original command before treating the code as equivalent.

A clear compatibility review means no loss was detected within the supported request features. It does not mean the request was sent, the server accepted it, cross-origin policy permits it, or the response handling is suitable for production.

Placeholders such as <REDACTED_AUTHORIZATION> are deliberate breakpoints. Replace them through the destination application's secret-management path, then test against a safe environment. Never replace them by committing credentials into source code.

Technical Details:

An HTTP request has a method, target URI, header fields, optional content, and control data such as redirect policy. Conversion first reduces the shell command to that request model, then writes the model in the target client's syntax. Response display and progress flags do not belong to the request itself and are omitted with a note.

Rule Core

Input feature Rule Result
-X or --request Use the explicit HTTP method unless it conflicts with GET or HEAD controls. The method is projected exactly after token validation.
-H or --header Require a valid, non-empty Name: value field; repeated names are rejected. Headers are written in the target client's native form.
-d and related data options Join repeated data values with &; reject local-file and standard-input reads. Default method becomes POST unless another valid method rule applies.
--json Do not mix with other data modes; add JSON content and accept headers when absent. The literal JSON text becomes the request body.
-G or --get Move data text into the query string and clear the body. The request method becomes GET unless an incompatible explicit method was supplied.
-u user:password Require both values; interactive password prompts are not supported. Generate the target client's Basic Auth form, with the password redacted by default.
-L, -I, and --url Preserve follow-redirects, HEAD, and one explicit URL within the supported request. Runtime-specific redirect behavior is reported when it cannot match exactly.

The input is limited to 50,000 characters, 256 shell tokens, and 20,000 characters per token. It must start with curl or curl.exe and contain exactly one concrete HTTP or HTTPS URL. URL globbing, multiple commands, file uploads, cookie files, header files, proxies, and certificate controls are rejected instead of approximated.

Transformation Core

A command shaped like curl 'HTTPS API URL' -H 'Authorization: Bearer secret' --json '{"name":"Ada"}' moves through four explicit stages:

Stage Intermediate result Why it matters
Shell scan Quoted tokens are separated without executing the command. Variables, substitutions, operators, and command chains cannot run or silently change meaning.
Request interpretation POST, one HTTPS URL, JSON body, and JSON headers cURL-specific spelling is reduced to HTTP meaning.
Secret handling The Authorization value becomes <REDACTED_AUTHORIZATION>. The generated snippet remains reviewable without carrying the recognized credential.
Client projection Setup, headers and authentication, request and body, then response handling Each runtime receives equivalent fields in its own API shape.

Browser Fetch cannot set every header that a command-line client accepts. Host, Cookie, Content-Length, Origin, Referer, connection controls, proxy fields, and Sec-* headers are examples of browser-managed values that may be omitted with a warning. A manual cross-origin redirect can also produce an opaque redirect response.

Ruby's standard HTTP client does not follow redirects automatically in the generated form, so a follow-redirect request is returned as the first redirect response with a compatibility note. Other clients receive explicit redirect settings matching the parsed choice.

Security and Privacy Notes:

The command is parsed locally as text and is never executed or transmitted by the converter. Generated code is also not run. Copying, downloading, sharing, or later executing the result is a separate action under your control.

  • Default redaction covers common authorization, cookie, API-key, token, secret, and Basic Auth password patterns. Inspect URLs and bodies for credentials that those names cannot reveal.
  • Do not test a mutating POST, PUT, PATCH, or DELETE request against production merely to confirm syntax.
  • Review TLS handling, timeouts, retries, response limits, and error policy in the destination application; they are outside this one-request conversion.

References: