> For the complete documentation index, see [llms.txt](/llms.txt). [◆ miniwebtool /api](/) [Tools](/tools/) [Docs](/docs/) [Reference](/v1/docs) [Pricing](/#pricing) [Log in](/dashboard/login/) [Start free](/billing/checkout/?plan=free) - [Home](/) - › - [Tools](/tools/) - › - [Text](/tools/#text) - › - Line Counter API # Line Counter API text 1 credits / call v2026-04-22 Count total / non-empty / empty lines and longest-line length. Use this endpoint to add Line Counter to your app, site, workflow, or agent without rebuilding formulas, validation, examples, and docs. Prefer the browser version? [Open the Line Counter on miniwebtool.com](https://miniwebtool.com/line-counter/). [Start free — get a key →](/billing/checkout/?plan=free) 1,000 credits · no card · 30 seconds What this saves Skip a custom implementation, validation rules, examples, OpenAPI shape, billing checks, and support copy for this utility. Where it fits Product forms, calculator pages, finance content, education flows, support tools, automations, and agent actions. How to evaluate Inspect the required fields, try the hosted playground, then copy cURL, Python, or Node code into your integration. ### Endpoint ```text POST https://api.miniwebtool.com/v1/tools/line-counter/run ``` ### Request body Field Type Req. `text` `str` ✓ ### Cost & access - 1 credit per successful call. - Starts on: Free. - Max payload: 65536 bytes. - Privacy mode:`hash_only` - Available on: free, starter, pro, business, scale ### Response envelope ```text { "request_id": "01K...", "tool": "line-counter", "tool_version": "2026-04-22", "credits_used": 1, "result": {... } } ``` ### Try it API key * Stored only in this browser tab. Playground test key is prefilled and only works on this page. [Get a live key →](/billing/checkout/?plan=free) text (str) * first line second line fourth Send request → Response copy body This endpoint starts on Free Your key is valid, but its current plan cannot call`line-counter`. Upgrade to Free or higher to run this tool. [Start Free →](/billing/checkout/?plan=free) [Compare plans](/#pricing) ```text ``` Response headers ```text ``` ### Code examples cURL Python JavaScript PHP Ruby Go Java copy ```text curl -X POST https://api.miniwebtool.com/v1/tools/line-counter/run \ -H 'Authorization: Bearer mwt_live_YOUR_KEY' \ -H 'Content-Type: application/json' \ -d '{"text":"first line\nsecond line\n\nfourth"}' ``` copy ```text import requests resp = requests.post( 'https://api.miniwebtool.com/v1/tools/line-counter/run', headers={'Authorization': 'Bearer mwt_live_YOUR_KEY'}, json={'text': 'first line\nsecond line\n\nfourth'}, ) resp.raise_for_status() print(resp.json()) ``` copy ```text const resp = await fetch( 'https://api.miniwebtool.com/v1/tools/line-counter/run', { method: 'POST', headers: { 'Authorization': 'Bearer mwt_live_YOUR_KEY', 'Content-Type': 'application/json', }, body: JSON.stringify({"text":"first line\nsecond line\n\nfourth"}), } ); const data = await resp.json(); console.log(data); ``` copy ```text true, CURLOPT_RETURNTRANSFER => true, CURLOPT_HTTPHEADER => [ 'Authorization: Bearer mwt_live_YOUR_KEY', 'Content-Type: application/json', ], CURLOPT_POSTFIELDS => json_encode([ 'text' => 'first line second line fourth' ]), ]); $resp = curl_exec($ch); curl_close($ch); print_r(json_decode($resp, true)); ``` copy ```text require 'net/http' require 'json' require 'uri' uri = URI('https://api.miniwebtool.com/v1/tools/line-counter/run') http = Net::HTTP.new(uri.host, uri.port) http.use_ssl = (uri.scheme == 'https') req = Net::HTTP::Post.new(uri) req['Authorization'] = 'Bearer mwt_live_YOUR_KEY' req['Content-Type'] = 'application/json' req.body = { 'text' => 'first line second line fourth' }.to_json resp = http.request(req) puts JSON.parse(resp.body).inspect ``` copy ```text package main import ( "bytes" "encoding/json" "fmt" "io" "net/http" ) func main() { body, _:= json.Marshal(map[string]interface{}{ "text": "first line second line fourth", }) req, _:= http.NewRequest("POST", "https://api.miniwebtool.com/v1/tools/line-counter/run", bytes.NewReader(body)) req.Header.Set("Authorization", "Bearer mwt_live_YOUR_KEY") req.Header.Set("Content-Type", "application/json") resp, err:= http.DefaultClient.Do(req) if err!= nil { panic(err) } defer resp.Body.Close() out, _:= io.ReadAll(resp.Body) fmt.Println(string(out)) } ``` copy ```text import java.net.URI; import java.net.http.*; var client = HttpClient.newHttpClient(); var req = HttpRequest.newBuilder() .uri(URI.create("https://api.miniwebtool.com/v1/tools/line-counter/run")) .header("Authorization", "Bearer mwt_live_YOUR_KEY") .header("Content-Type", "application/json") .POST(HttpRequest.BodyPublishers.ofString("{\"text\":\"first line\\nsecond line\\n\\nfourth\"}")) .build(); var resp = client.send(req, HttpResponse.BodyHandlers.ofString()); System.out.println(resp.body()); ``` ## How to call Line Counter - 1 Get an API key [Get an API key](/billing/checkout/?plan=free). Sign up free for a bearer token. 1,000 credits/month, no card. - 2 Assemble the JSON body Required fields:`text`. See the Request body table below for the full schema. - 3 POST to`https://api.miniwebtool.com/v1/tools/line-counter/run` Headers:`Authorization: Bearer `and`Content-Type: application/json`. Copy-paste snippets in 7 languages are under Code examples. - 4 Parse the response Envelope:`{request_id, tool, tool_version, credits_used, result}`. The typed output lives in`result`. ## Frequently asked What does the Line Counter API do? ▾ Count total / non-empty / empty lines and longest-line length. Use it to add this utility without rebuilding formulas, validation, examples, and documentation. How much does one call to Line Counter cost? ▾ 1 credit per successful call. Failed calls (validation errors, 5xx) don't bill. What parameters does the Line Counter API require? ▾ Required fields: text. Full schema at /v1/openapi.json. Is the Line Counter API deterministic? ▾ Yes — same input, same output, forever. Tool version 2026-04-22; output shape is stable within a major version. Can an AI agent call the Line Counter API? ▾ Yes. Connect to https://api.miniwebtool.com/v1/mcp over the Model Context Protocol. The agent discovers `line-counter` with its JSON Schema automatically, so the model can plan while MiniWebtool handles the exact tool result. What format does the API return? ▾ JSON with a stable envelope: `{request_id, tool, tool_version, credits_used, result}`. Errors are RFC 7807 `application/problem+json`. ## Use from an AI agent Every endpoint on this site is also exposed via the [Model Context Protocol](/docs/#mcp) at`https://api.miniwebtool.com/v1/mcp`. Claude, Cursor, and any MCP-capable agent can discover this tool (`line-counter`) and its JSON Schema automatically — no client codegen. ```text # List tools the agent can call curl -s https://api.miniwebtool.com/v1/mcp \ -H 'Content-Type: application/json' \ -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' \ | jq '.result.tools[] | select(.name=="line-counter")' ``` ## Related text tools [ Remove Accent Remove accents and combining marks from Unicode text. ](/tools/remove-accent/) [ Word Counter Count words, characters, sentences, paragraphs, reading/speaking time, top word… ](/tools/word-counter/) [ Character Counter Count characters, letters, digits, whitespace, and punctuation. ](/tools/character-counter/) [ Remove Spaces Strip whitespace: all, extra, leading, trailing, or per-line. ](/tools/remove-spaces/) © 2026 miniwebtool. API is a separate product from the consumer site. 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