API Requests

Base URL

https://paste.flex.pm/api/v1

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Rate Limits

• POST /pastes → 20 req/min per IP
• GET /pastes → 10 req/min per IP

Headers in every response:

• X-RateLimit-Limit
• X-RateLimit-Remaining
• X-RateLimit-Reset

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Authentication

No authentication required. All endpoints are public (with rate limits).

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Endpoints

1. Create Paste

POST /pastes

Field	Type	Required	Notes
content	string	✅	Paste text (1MB)
title	string	❌	Max 100 chars
language	string	❌	Syntax highlighting
visibility	string	❌	public, unlisted, private
burnAfterRead	boolean	❌	Delete after first view
expiration	string	❌	never, 1hour, 1day, 1week, 1month
password	string	❌	Protect paste
maxViews	number	❌	1–1000 views

Example:

curl -X POST https://paste.flex.pm/api/v1/pastes \
  -H "Content-Type: application/json" \
  -d '{
    "title": "Hello World",
    "content": "console.log(\"Hello, World!\");",
    "language": "javascript",
    "visibility": "public",
    "expiration": "1week"
  }'

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2. Retrieve Paste

GET /pastes?id={pasteId}

Param	Type	Required	Description
id	string	✅	Paste ID

Example:

curl "https://paste.flex.pm/api/v1/pastes?id=abc123def"

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Error Codes

Code	Meaning
INVALID_JSON	Bad JSON body
EMPTY_BODY	Request body missing
VALIDATION_ERROR	Missing/invalid fields
CONTENT_TOO_LARGE	Exceeds 1MB
TITLE_TOO_LONG	Title >100 chars
INVALID_EXPIRATION	Wrong expiration value
RATE_LIMIT_EXCEEDED	Too many requests
MISSING_ID	Paste ID required
PASTE_NOT_FOUND	Paste does not exist
PASTE_EXPIRED	Paste expired
PASTE_BURNED	Burn-after-read triggered
MAX_VIEWS_REACHED	View limit hit
DATABASE_ERROR	DB issue

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Examples

Simple text

curl -X POST https://paste.flex.pm/api/v1/pastes \
  -H "Content-Type: application/json" \
  -d '{"content": "My notes"}'

Code snippet

-d '{
  "title": "React Component",
  "content": "function App(){return <div>Hello</div>}",
  "language": "javascript"
}'

Private + password

-d '{
  "content": "api_key=secret123",
  "visibility": "private",
  "password": "mypassword"
}'

Burn after read

-d '{
  "content": "One-time secret",
  "burnAfterRead": true
}'

Limited views

-d '{
  "content": "5-view paste",
  "maxViews": 5
}'

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Supported Languages

FlexPaste supports 90+ languages and formats.

• Web: javascript, typescript, jsx, tsx, html, css, scss
• General: python, java, csharp, cpp, c, go, rust, php, ruby, swift
• Functional: haskell, clojure, elixir, erlang, fsharp, ocaml
• Shell & Scripts: bash, zsh, powershell, batch
• Data/Config: json, yaml, toml, ini, xml, csv
• Database: sql, plsql, mongodb
• Docs: markdown, latex, asciidoc
• DevOps: docker, terraform, kubernetes, nginx, apache
• Other: regex, diff, git, protobuf, graphql, solidity, wasm, assembly
• Scientific/Legacy: r, matlab, julia, fortran, cobol, pascal

👉 For plain text, use text or leave language empty.

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Client Examples

Node.js

const res = await fetch("https://paste.flex.pm/api/v1/pastes", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({ content: "console.log('Hello')" })
});
console.log(await res.json());

Python

import requests
res = requests.post("https://paste.flex.pm/api/v1/pastes", json={
  "content": "print('Hello')"
})
print(res.json())