Interlinear view shows the original Hebrew/Greek text with word-by-word translation (KJV).
1
Τεκνία children μου, I/we ταῦτα this/he/she/it γράφω write ὑμῖν you ἵνα in order tha… μὴ not ἁμάρτητε· sin καὶ and ἐάν if τις one ἁμάρτῃ, sin παράκλητον counsellor ἔχομεν have/be πρὸς to/with τὸν the/this/who πατέρα, father Ἰησοῦν Jesus/Joshua Χριστὸν Christ δίκαιον, just
2
καὶ and αὐτὸς he/she/it/self ἱλασμός propitiation ἐστιν be περὶ about τῶν the/this/who ἁμαρτιῶν sin ἡμῶν· I/we οὐ no περὶ about τῶν the/this/who ἡμετέρων our δὲ but/and μόνον alone ἀλλὰ but καὶ and περὶ about ὅλου all τοῦ the/this/who κόσμου. world
3
καὶ and ἐν in/on/among τούτῳ this/he/she/it γινώσκομεν know ὅτι that/since ἐγνώκαμεν know αὐτόν, he/she/it/self ἐὰν if τὰς the/this/who ἐντολὰς commandment αὐτοῦ he/she/it/self τηρῶμεν. keep
4
Ὁ the/this/who λέγων speak ἔγνωκα know αὐτὸν he/she/it/self καὶ and τὰς the/this/who ἐντολὰς commandment αὐτοῦ he/she/it/self μὴ not τηρῶν, keep ψεύστης liar ἐστίν, be καὶ and ἐν in/on/among τούτῳ this/he/she/it ἡ the/this/who ἀλήθεια truth οὐκ no ἔστιν· be
5
ὃς which δ᾽ but/and ἂν if τηρῇ keep αὐτοῦ he/she/it/self τὸν the/this/who λόγον, word ἀληθῶς truly ἐν in/on/among τούτῳ this/he/she/it ἡ the/this/who ἀγάπη love τοῦ the/this/who θεοῦ God τετελείωται. perfect ἐν in/on/among τούτῳ this/he/she/it γινώσκομεν know ὅτι that/since ἐν in/on/among αὐτῷ he/she/it/self ἐσμεν. be
6
ὁ the/this/who λέγων speak ἐν in/on/among αὐτῷ he/she/it/self μένειν stay ὀφείλει, owe καθὼς as/just as ἐκεῖνος that περιεπάτησεν, walk καὶ and αὐτὸς he/she/it/self οὕτως thus περιπατεῖν. walk
7
Ἀγαπητοί, beloved οὐκ no ἐντολὴν commandment καινὴν new γράφω write ὑμῖν you ἀλλ᾽ but